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Rosario C.

@ionicboy

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Analog & Digital Embedded Systems Designer - ECAD Modeller

$15 USD / Hour

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Italy (6:01 AM)

・

Joined on June 27, 2010

$15 USD / Hour

・

I Develop Embedded System with most of actually present architectures (8/16/32bit, FPGA) for entertainment, domotic, industrial controls, dsp and telecommunications systems. Also I design Analogue Electronics in Power, Hi-Fi, and RF application fields.

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This is one of my old design, a class AB analog power amplifier:
GAIN 27 dB
INPUT IMPEDANCE 24kOhm
FREQUENCY RESPONSE 10Hz-30KHz
THD 0.04% by 1W
POWER 60W by 35V, 8Ohm
POWER 100W by 35V, 4Ohm
DC OFFSET minor of 0.1V
2 indipendent mono channels;
2 indipendent Power supplies for preserv "diaphonias"
SIM (sound impartment monitor) & BR (bypass) inputs
speak-on connectors
berillium junctions in all connectors;

The circuit maked up by four blocks: input stage, main amplifier, drivers, output stage. The input stage is a differential pairwith a simple current pump. the main amplifier is a PNP-BJT in CE configuration (classA). The drivers are a couple of BJT with purpose to iniect the base current in the output-stage. This work is simplified by a Vbe's multiplier At the end the output-stage that is maked up by classic p

Hi-Fi Power End-Stage - Amplifier Class AB

This is one of my old design, a class AB analog power amplifier:
GAIN 27 dB
INPUT IMPEDANCE 24kOhm
FREQUENCY RESPONSE 10Hz-30KHz
THD 0.04% by 1W
POWER 60W by 35V, 8Ohm
POWER 100W by 35V, 4Ohm
DC OFFSET minor of 0.1V
2 indipendent mono channels;
2 indipendent Power supplies for preserv "diaphonias"
SIM (sound impartment monitor) & BR (bypass) inputs
speak-on connectors
berillium junctions in all connectors;

The circuit maked up by four blocks: input stage, main amplifier, drivers, output stage. The input stage is a differential pairwith a simple current pump. the main amplifier is a PNP-BJT in CE configuration (classA). The drivers are a couple of BJT with purpose to iniect the base current in the output-stage. This work is simplified by a Vbe's multiplier At the end the output-stage that is maked up by classic p

Hi-Fi Power End-Stage - Amplifier Class AB

This is one of my old design, a class AB analog power amplifier:
GAIN 27 dB
INPUT IMPEDANCE 24kOhm
FREQUENCY RESPONSE 10Hz-30KHz
THD 0.04% by 1W
POWER 60W by 35V, 8Ohm
POWER 100W by 35V, 4Ohm
DC OFFSET minor of 0.1V
2 indipendent mono channels;
2 indipendent Power supplies for preserv "diaphonias"
SIM (sound impartment monitor) & BR (bypass) inputs
speak-on connectors
berillium junctions in all connectors;

The circuit maked up by four blocks: input stage, main amplifier, drivers, output stage. The input stage is a differential pairwith a simple current pump. the main amplifier is a PNP-BJT in CE configuration (classA). The drivers are a couple of BJT with purpose to iniect the base current in the output-stage. This work is simplified by a Vbe's multiplier At the end the output-stage that is maked up by classic p

Hi-Fi Power End-Stage - Amplifier Class AB

This is one of my old design, a class AB analog power amplifier:
GAIN 27 dB
INPUT IMPEDANCE 24kOhm
FREQUENCY RESPONSE 10Hz-30KHz
THD 0.04% by 1W
POWER 60W by 35V, 8Ohm
POWER 100W by 35V, 4Ohm
DC OFFSET minor of 0.1V
2 indipendent mono channels;
2 indipendent Power supplies for preserv "diaphonias"
SIM (sound impartment monitor) & BR (bypass) inputs
speak-on connectors
berillium junctions in all connectors;

The circuit maked up by four blocks: input stage, main amplifier, drivers, output stage. The input stage is a differential pairwith a simple current pump. the main amplifier is a PNP-BJT in CE configuration (classA). The drivers are a couple of BJT with purpose to iniect the base current in the output-stage. This work is simplified by a Vbe's multiplier At the end the output-stage that is maked up by classic p

Hi-Fi Power End-Stage - Amplifier Class AB

This is one of my old design, a class AB analog power amplifier:
GAIN 27 dB
INPUT IMPEDANCE 24kOhm
FREQUENCY RESPONSE 10Hz-30KHz
THD 0.04% by 1W
POWER 60W by 35V, 8Ohm
POWER 100W by 35V, 4Ohm
DC OFFSET minor of 0.1V
2 indipendent mono channels;
2 indipendent Power supplies for preserv "diaphonias"
SIM (sound impartment monitor) & BR (bypass) inputs
speak-on connectors
berillium junctions in all connectors;

The circuit maked up by four blocks: input stage, main amplifier, drivers, output stage. The input stage is a differential pairwith a simple current pump. the main amplifier is a PNP-BJT in CE configuration (classA). The drivers are a couple of BJT with purpose to iniect the base current in the output-stage. This work is simplified by a Vbe's multiplier At the end the output-stage that is maked up by classic p

Hi-Fi Power End-Stage - Amplifier Class AB

This is a sample how an ECAD approach to an electronic-engineering's problem can leads to the solution with precision and accuracy.
When we polarize an active device we want force voltages & currents for the operation that we chose. But we don't know the temperature of junction therefore the calcolus of power dissipation is left to an approximate one, based on thermic-resistance (that we find in the datasheet) and analogy laws. Exist another approach to this problem. Solve a symbolic, exact system based on model of active device, parameters extracted with measurements, and a suitable set of non-linear equation by a numeric cycle and non-linear solving technique (Newton-Raphson Method in our case).

TOPAS - Thermal Operating Point Analysis Software

This is a sample how an ECAD approach to an electronic-engineering's problem can leads to the solution with precision and accuracy.
When we polarize an active device we want force voltages & currents for the operation that we chose. But we don't know the temperature of junction therefore the calcolus of power dissipation is left to an approximate one, based on thermic-resistance (that we find in the datasheet) and analogy laws. Exist another approach to this problem. Solve a symbolic, exact system based on model of active device, parameters extracted with measurements, and a suitable set of non-linear equation by a numeric cycle and non-linear solving technique (Newton-Raphson Method in our case).

TOPAS - Thermal Operating Point Analysis Software

This is a sample how an ECAD approach to an electronic-engineering's problem can leads to the solution with precision and accuracy.
When we polarize an active device we want force voltages & currents for the operation that we chose. But we don't know the temperature of junction therefore the calcolus of power dissipation is left to an approximate one, based on thermic-resistance (that we find in the datasheet) and analogy laws. Exist another approach to this problem. Solve a symbolic, exact system based on model of active device, parameters extracted with measurements, and a suitable set of non-linear equation by a numeric cycle and non-linear solving technique (Newton-Raphson Method in our case).

TOPAS - Thermal Operating Point Analysis Software

This is a sample how an ECAD approach to an electronic-engineering's problem can leads to the solution with precision and accuracy.
When we polarize an active device we want force voltages & currents for the operation that we chose. But we don't know the temperature of junction therefore the calcolus of power dissipation is left to an approximate one, based on thermic-resistance (that we find in the datasheet) and analogy laws. Exist another approach to this problem. Solve a symbolic, exact system based on model of active device, parameters extracted with measurements, and a suitable set of non-linear equation by a numeric cycle and non-linear solving technique (Newton-Raphson Method in our case).

TOPAS - Thermal Operating Point Analysis Software

This is a sample how an ECAD approach to an electronic-engineering's problem can leads to the solution with precision and accuracy.
When we polarize an active device we want force voltages & currents for the operation that we chose. But we don't know the temperature of junction therefore the calcolus of power dissipation is left to an approximate one, based on thermic-resistance (that we find in the datasheet) and analogy laws. Exist another approach to this problem. Solve a symbolic, exact system based on model of active device, parameters extracted with measurements, and a suitable set of non-linear equation by a numeric cycle and non-linear solving technique (Newton-Raphson Method in our case).

TOPAS - Thermal Operating Point Analysis Software

In this module the problem rised is the identification of a sinusoidal signal sampled by sampler or a DSO (my case) minimizing the quantization error..
The desired objects are amplitude, mean value, frequency and phase of sampled signal.
This algorithm is complex because the are several problems in the frequency and phase detection. The use of FFT is usefull until the frequency is not much high then a pitch-detection algorithm is developed.
In the image you can see a flow-diagram of the module of "Sinusoidal Fitting"

Identification Algorithm

This algorithm is a piece of a complex work made for my MS thesys, and it's another example of ECAD's application applied to a RF measurement's bench design.

The problem solved from this software-module is that one of the specifications of the bench is the possibility of polarize an oscillator (DUT) in automatic and customizable way.

If the oscillators/ILO is designed in one transistor configuration (for example Colpitts's oscillator presented in article 1MHz to 10MHz Electronic Controlled ILO: ), the problem became set the required voltage in the correct sequence for prevent damages of DUT and of instrumentation (SMU or other remote power supply).

Extrapolation Algorithm

This test set is part of larger project in which I realize an Automatic Bench for the characterization of RF-ILO (injection Locked Oscillator).
This test set is usefull for show to an oscilloscope the phase's transients (alias envelop) during the lock-in, in-band sweep, an lock-out of an ILO.

Test Set for Automatic Bench

This test set is part of larger project in which I realize an Automatic Bench for the characterization of RF-ILO (injection Locked Oscillator).
This test set is usefull for show to an oscilloscope the phase's transients (alias envelop) during the lock-in, in-band sweep, an lock-out of an ILO.

Test Set for Automatic Bench

This test set is part of larger project in which I realize an Automatic Bench for the characterization of RF-ILO (injection Locked Oscillator).
This test set is usefull for show to an oscilloscope the phase's transients (alias envelop) during the lock-in, in-band sweep, an lock-out of an ILO.

Test Set for Automatic Bench

This is my first project of loudspeaker:
- 200W;
- 4 Ohm of impedence;
- 2 ways;
- The body of speakers is archieved in mahogany multilayer laminate wood;
- The body is achieved with patient and with care;
- The body is designed and simulated with care for optimize the armonic response
of the speaker in all audio frequencies range;
- The speaker have a mechanism for prevent that peck can damage the tweeter
(Horns);
- The performances are improved by the steel conical de-coupler (for low freqs);
- The wiring is done with hi-quality wire and all wire in the inner space are coated by
acoustic-material;
- The filter section optimize the response of speakers;
- The inner space of loudspeakers is replenished with acoustic-material for match the design specifications;

200W Loudspeaker

This is my first project of loudspeaker:
- 200W;
- 4 Ohm of impedence;
- 2 ways;
- The body of speakers is archieved in mahogany multilayer laminate wood;
- The body is achieved with patient and with care;
- The body is designed and simulated with care for optimize the armonic response
of the speaker in all audio frequencies range;
- The speaker have a mechanism for prevent that peck can damage the tweeter
(Horns);
- The performances are improved by the steel conical de-coupler (for low freqs);
- The wiring is done with hi-quality wire and all wire in the inner space are coated by
acoustic-material;
- The filter section optimize the response of speakers;
- The inner space of loudspeakers is replenished with acoustic-material for match the design specifications;

200W Loudspeaker

This is my first project of loudspeaker:
- 200W;
- 4 Ohm of impedence;
- 2 ways;
- The body of speakers is archieved in mahogany multilayer laminate wood;
- The body is achieved with patient and with care;
- The body is designed and simulated with care for optimize the armonic response
of the speaker in all audio frequencies range;
- The speaker have a mechanism for prevent that peck can damage the tweeter
(Horns);
- The performances are improved by the steel conical de-coupler (for low freqs);
- The wiring is done with hi-quality wire and all wire in the inner space are coated by
acoustic-material;
- The filter section optimize the response of speakers;
- The inner space of loudspeakers is replenished with acoustic-material for match the design specifications;

200W Loudspeaker

This is one of my old design, a class AB analog power amplifier:
GAIN 27 dB
INPUT IMPEDANCE 24kOhm
FREQUENCY RESPONSE 10Hz-30KHz
THD 0.04% by 1W
POWER 60W by 35V, 8Ohm
POWER 100W by 35V, 4Ohm
DC OFFSET minor of 0.1V
2 indipendent mono channels;
2 indipendent Power supplies for preserv "diaphonias"
SIM (sound impartment monitor) & BR (bypass) inputs
speak-on connectors
berillium junctions in all connectors;

The circuit maked up by four blocks: input stage, main amplifier, drivers, output stage. The input stage is a differential pairwith a simple current pump. the main amplifier is a PNP-BJT in CE configuration (classA). The drivers are a couple of BJT with purpose to iniect the base current in the output-stage. This work is simplified by a Vbe's multiplier At the end the output-stage that is maked up by classic p

Hi-Fi Power End-Stage - Amplifier Class AB

This is one of my old design, a class AB analog power amplifier:
GAIN 27 dB
INPUT IMPEDANCE 24kOhm
FREQUENCY RESPONSE 10Hz-30KHz
THD 0.04% by 1W
POWER 60W by 35V, 8Ohm
POWER 100W by 35V, 4Ohm
DC OFFSET minor of 0.1V
2 indipendent mono channels;
2 indipendent Power supplies for preserv "diaphonias"
SIM (sound impartment monitor) & BR (bypass) inputs
speak-on connectors
berillium junctions in all connectors;

The circuit maked up by four blocks: input stage, main amplifier, drivers, output stage. The input stage is a differential pairwith a simple current pump. the main amplifier is a PNP-BJT in CE configuration (classA). The drivers are a couple of BJT with purpose to iniect the base current in the output-stage. This work is simplified by a Vbe's multiplier At the end the output-stage that is maked up by classic p

Hi-Fi Power End-Stage - Amplifier Class AB

This is one of my old design, a class AB analog power amplifier:
GAIN 27 dB
INPUT IMPEDANCE 24kOhm
FREQUENCY RESPONSE 10Hz-30KHz
THD 0.04% by 1W
POWER 60W by 35V, 8Ohm
POWER 100W by 35V, 4Ohm
DC OFFSET minor of 0.1V
2 indipendent mono channels;
2 indipendent Power supplies for preserv "diaphonias"
SIM (sound impartment monitor) & BR (bypass) inputs
speak-on connectors
berillium junctions in all connectors;

The circuit maked up by four blocks: input stage, main amplifier, drivers, output stage. The input stage is a differential pairwith a simple current pump. the main amplifier is a PNP-BJT in CE configuration (classA). The drivers are a couple of BJT with purpose to iniect the base current in the output-stage. This work is simplified by a Vbe's multiplier At the end the output-stage that is maked up by classic p

Hi-Fi Power End-Stage - Amplifier Class AB

This is one of my old design, a class AB analog power amplifier:
GAIN 27 dB
INPUT IMPEDANCE 24kOhm
FREQUENCY RESPONSE 10Hz-30KHz
THD 0.04% by 1W
POWER 60W by 35V, 8Ohm
POWER 100W by 35V, 4Ohm
DC OFFSET minor of 0.1V
2 indipendent mono channels;
2 indipendent Power supplies for preserv "diaphonias"
SIM (sound impartment monitor) & BR (bypass) inputs
speak-on connectors
berillium junctions in all connectors;

The circuit maked up by four blocks: input stage, main amplifier, drivers, output stage. The input stage is a differential pairwith a simple current pump. the main amplifier is a PNP-BJT in CE configuration (classA). The drivers are a couple of BJT with purpose to iniect the base current in the output-stage. This work is simplified by a Vbe's multiplier At the end the output-stage that is maked up by classic p

Hi-Fi Power End-Stage - Amplifier Class AB

This is one of my old design, a class AB analog power amplifier:
GAIN 27 dB
INPUT IMPEDANCE 24kOhm
FREQUENCY RESPONSE 10Hz-30KHz
THD 0.04% by 1W
POWER 60W by 35V, 8Ohm
POWER 100W by 35V, 4Ohm
DC OFFSET minor of 0.1V
2 indipendent mono channels;
2 indipendent Power supplies for preserv "diaphonias"
SIM (sound impartment monitor) & BR (bypass) inputs
speak-on connectors
berillium junctions in all connectors;

The circuit maked up by four blocks: input stage, main amplifier, drivers, output stage. The input stage is a differential pairwith a simple current pump. the main amplifier is a PNP-BJT in CE configuration (classA). The drivers are a couple of BJT with purpose to iniect the base current in the output-stage. This work is simplified by a Vbe's multiplier At the end the output-stage that is maked up by classic p

Hi-Fi Power End-Stage - Amplifier Class AB

This is a sample how an ECAD approach to an electronic-engineering's problem can leads to the solution with precision and accuracy.
When we polarize an active device we want force voltages & currents for the operation that we chose. But we don't know the temperature of junction therefore the calcolus of power dissipation is left to an approximate one, based on thermic-resistance (that we find in the datasheet) and analogy laws. Exist another approach to this problem. Solve a symbolic, exact system based on model of active device, parameters extracted with measurements, and a suitable set of non-linear equation by a numeric cycle and non-linear solving technique (Newton-Raphson Method in our case).

TOPAS - Thermal Operating Point Analysis Software

This is a sample how an ECAD approach to an electronic-engineering's problem can leads to the solution with precision and accuracy.
When we polarize an active device we want force voltages & currents for the operation that we chose. But we don't know the temperature of junction therefore the calcolus of power dissipation is left to an approximate one, based on thermic-resistance (that we find in the datasheet) and analogy laws. Exist another approach to this problem. Solve a symbolic, exact system based on model of active device, parameters extracted with measurements, and a suitable set of non-linear equation by a numeric cycle and non-linear solving technique (Newton-Raphson Method in our case).

TOPAS - Thermal Operating Point Analysis Software

This is a sample how an ECAD approach to an electronic-engineering's problem can leads to the solution with precision and accuracy.
When we polarize an active device we want force voltages & currents for the operation that we chose. But we don't know the temperature of junction therefore the calcolus of power dissipation is left to an approximate one, based on thermic-resistance (that we find in the datasheet) and analogy laws. Exist another approach to this problem. Solve a symbolic, exact system based on model of active device, parameters extracted with measurements, and a suitable set of non-linear equation by a numeric cycle and non-linear solving technique (Newton-Raphson Method in our case).

TOPAS - Thermal Operating Point Analysis Software

This is a sample how an ECAD approach to an electronic-engineering's problem can leads to the solution with precision and accuracy.
When we polarize an active device we want force voltages & currents for the operation that we chose. But we don't know the temperature of junction therefore the calcolus of power dissipation is left to an approximate one, based on thermic-resistance (that we find in the datasheet) and analogy laws. Exist another approach to this problem. Solve a symbolic, exact system based on model of active device, parameters extracted with measurements, and a suitable set of non-linear equation by a numeric cycle and non-linear solving technique (Newton-Raphson Method in our case).

TOPAS - Thermal Operating Point Analysis Software

This is a sample how an ECAD approach to an electronic-engineering's problem can leads to the solution with precision and accuracy.
When we polarize an active device we want force voltages & currents for the operation that we chose. But we don't know the temperature of junction therefore the calcolus of power dissipation is left to an approximate one, based on thermic-resistance (that we find in the datasheet) and analogy laws. Exist another approach to this problem. Solve a symbolic, exact system based on model of active device, parameters extracted with measurements, and a suitable set of non-linear equation by a numeric cycle and non-linear solving technique (Newton-Raphson Method in our case).

TOPAS - Thermal Operating Point Analysis Software

In this module the problem rised is the identification of a sinusoidal signal sampled by sampler or a DSO (my case) minimizing the quantization error..
The desired objects are amplitude, mean value, frequency and phase of sampled signal.
This algorithm is complex because the are several problems in the frequency and phase detection. The use of FFT is usefull until the frequency is not much high then a pitch-detection algorithm is developed.
In the image you can see a flow-diagram of the module of "Sinusoidal Fitting"

Identification Algorithm

This algorithm is a piece of a complex work made for my MS thesys, and it's another example of ECAD's application applied to a RF measurement's bench design.

The problem solved from this software-module is that one of the specifications of the bench is the possibility of polarize an oscillator (DUT) in automatic and customizable way.

If the oscillators/ILO is designed in one transistor configuration (for example Colpitts's oscillator presented in article 1MHz to 10MHz Electronic Controlled ILO: ), the problem became set the required voltage in the correct sequence for prevent damages of DUT and of instrumentation (SMU or other remote power supply).

Extrapolation Algorithm

This test set is part of larger project in which I realize an Automatic Bench for the characterization of RF-ILO (injection Locked Oscillator).
This test set is usefull for show to an oscilloscope the phase's transients (alias envelop) during the lock-in, in-band sweep, an lock-out of an ILO.

Test Set for Automatic Bench

This test set is part of larger project in which I realize an Automatic Bench for the characterization of RF-ILO (injection Locked Oscillator).
This test set is usefull for show to an oscilloscope the phase's transients (alias envelop) during the lock-in, in-band sweep, an lock-out of an ILO.

Test Set for Automatic Bench

This test set is part of larger project in which I realize an Automatic Bench for the characterization of RF-ILO (injection Locked Oscillator).
This test set is usefull for show to an oscilloscope the phase's transients (alias envelop) during the lock-in, in-band sweep, an lock-out of an ILO.

Test Set for Automatic Bench

This is my first project of loudspeaker:
- 200W;
- 4 Ohm of impedence;
- 2 ways;
- The body of speakers is archieved in mahogany multilayer laminate wood;
- The body is achieved with patient and with care;
- The body is designed and simulated with care for optimize the armonic response
of the speaker in all audio frequencies range;
- The speaker have a mechanism for prevent that peck can damage the tweeter
(Horns);
- The performances are improved by the steel conical de-coupler (for low freqs);
- The wiring is done with hi-quality wire and all wire in the inner space are coated by
acoustic-material;
- The filter section optimize the response of speakers;
- The inner space of loudspeakers is replenished with acoustic-material for match the design specifications;

200W Loudspeaker

This is my first project of loudspeaker:
- 200W;
- 4 Ohm of impedence;
- 2 ways;
- The body of speakers is archieved in mahogany multilayer laminate wood;
- The body is achieved with patient and with care;
- The body is designed and simulated with care for optimize the armonic response
of the speaker in all audio frequencies range;
- The speaker have a mechanism for prevent that peck can damage the tweeter
(Horns);
- The performances are improved by the steel conical de-coupler (for low freqs);
- The wiring is done with hi-quality wire and all wire in the inner space are coated by
acoustic-material;
- The filter section optimize the response of speakers;
- The inner space of loudspeakers is replenished with acoustic-material for match the design specifications;

200W Loudspeaker

This is my first project of loudspeaker:
- 200W;
- 4 Ohm of impedence;
- 2 ways;
- The body of speakers is archieved in mahogany multilayer laminate wood;
- The body is achieved with patient and with care;
- The body is designed and simulated with care for optimize the armonic response
of the speaker in all audio frequencies range;
- The speaker have a mechanism for prevent that peck can damage the tweeter
(Horns);
- The performances are improved by the steel conical de-coupler (for low freqs);
- The wiring is done with hi-quality wire and all wire in the inner space are coated by
acoustic-material;
- The filter section optimize the response of speakers;
- The inner space of loudspeakers is replenished with acoustic-material for match the design specifications;

200W Loudspeaker

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engineer

Oct, 2012 - Present

•

13 years, 2 months

sklab

Oct, 2012 - Present

•

13 years, 2 months

Oct, 2012 - Present

•

13 years, 2 months

free-lancer for electronic prototypes manifacturing

Sep, 2007 - Apr, 2012

•

4 years, 7 months

Kernel S

Sep, 2007 - Apr, 2012

•

4 years, 7 months

Analog & Digital Embedded Systems Designer

Sep, 2007 - Apr, 2012

•

4 years, 7 months

Università degli Studi di Palermo

2000 - 2012

•

12 years

micro-electronic engineer

Italy

2000 - 2012

•

12 years

Professional Facility in IT Engineering

2012

Albo delgi Ingegneri di Palermo

In italy this facility is required for act as free-lancer in all engineering fields. My qualification is in Information Technologies sec A

2012

Basic Numeracy

Analog Electronics

US English

Freelancer Orientation

Digital Electronics