Il corso ha la finalità di rendere lo studente in grado di analizzare e progettare amplificatori e circuiti retro-azionati. Il corso prevede anche esercitazioni numeriche in aula e l'uso del simulatore circuitale SPICE.
Gli studenti devono conoscere le trasformate di Laplace, i diagrammi di Bode, la retroazione e i criteri di stabilità. Gli studenti devono altresì conoscere la modellistica dei principali dispositivi a semiconduttore (diodi, transistori bipolari e transistori MOS) ed essere capaci di eseguire l'analisi di circuiti semplici con elementi attivi.
La frequenza non è obbligatoria, seppur fortemente consigliata.
Bipolar transistor models
The pn junction. BJT forward active region. Large-signal dc models. Operating modes. Small-signal models. Parasitic elements.
MOS transtor models
MOS structure and operating regions. MOSFET operating regions. MOSFET I-V characteristic. Large-signal dc models. Small-signal models.
Basic Bipolar circuits
BJTs' external resistances. Single-transistor circuits (CE, CC and CB). Current mirrors. Differential amplifiers. High-gain stages.
Basic MOSFET circuits
MOSFETs’ external resistances. Single-transistor circuits(CS, CD and CG). Current mirrors. Differential amplifiers. High-gain stages.
Output stages
Output stage characteristics and classification. Class-A Output stage. Class-B Output stage. Class-AB Output stage
Frequency response
General amplifiers' structure. Seeking poles and zeros. Single transistor stages: CE/CS, CC/CD and CB/CG. Current mirrors. Differential pair. High-gain stages.
Amplifiers dc analysis
General amplifiers' structure. Feedback. Two-port theory. Return ratio. Rosenstark method. Blackman method
Amplifiers ac analysis
Feedback amplifiers' general characteristics. Stability analysis. Stability criteria. Compensation techniques. Compensation of three-stage amplifiers.
Voltage and current reference circuits
Voltage/Current reference parameters. Current reference circuits. VBE vs T modeling. Bandgap voltage reference circuits: Widlar, Brokaw, Kuijk and Banba.
Operational Transconductance Amplifiers (OTAs)
Two-stage class-A OTA. Stacked mirrors OTA. Folded cascode OTA
Operational Amplifiers (OpAmps)
Two-stage CMOS OpAmp. Two-stage bipolar OpAmp. Low-offset low-noise bipolar OpAmp
The SPICE simulator
Design of electronic circuits by means of SPICE
La piattaforma studium.unict.it contiene
* | Argomenti | Riferimenti testi | |
1 | Bipolar transistor models: The pn junction. BJT forward active region. Large-signal dc models. Operating modes. Small-signal models. Parasitic elements. | 1,2,3,4 | |
2 | MOS transtor models: MOS structure and operating regions. MOSFET operating regions. MOSFET I-V characteristic. Large-signal dc models. Small-signal models. | 1,2,3,4 | |
3 | Basic Bipolar circuits: BJTs' external resistances. Single-transistor circuits (CE, CC and CB). Current mirrors. Differential amplifiers. High-gain stages. | 1,2,3,4 | |
4 | Basic MOSFET circuits: MOSFETs’ external resistances. Single-transistor circuits(CS, CD and CG). Current mirrors. Differential amplifiers. High-gain stages. | 1,2,3,4 | |
5 | Output stages: Output stage characteristics and classification. Class-A Output stage. Class-B Output stage. Class-AB Output stage. | 1,2,3,4 | |
6 | Frequency response: General amplifiers' structure. Seeking poles and zeros. Single transistor stages: CE/CS, CC/CD and CB/CG. Current mirrors. Differential pair. High-gain stages. | 1,2,3,4 | |
7 | * | Amplifiers dc analysis: General amplifiers' structure. Feedback. Two-port theory. Return ratio. Rosenstark method. Blackman method. | 1,2,3,4 |
8 | * | Amplifiers ac analysis: Feedback amplifiers' general characteristics. Stability analysis. Stability criteria. Compensation techniques. Compensation of three-stage amplifiers. | 1,2,3,4 |
9 | Voltage and current reference circuits: Voltage/Current reference parameters. Current reference circuits. VBE vs T modeling. Bandgap voltage reference circuits: Widlar, Brokaw, Kuijk and Banba. | 1,2,3,4 | |
10 | * | Operational Transconductance Amplifiers (OTAs): Two-stage class-A OTA. Stacked mirrors OTA. Folded cascode OTA. | 1,2,3,4 |
11 | * | Operational Amplifiers (OpAmps): Two-stage CMOS OpAmp. Two-stage bipolar OpAmp. Low-offset low-noise bipolar OpAmp. | 1,2,3,4 |
12 | The SPICE simulator: Design of electronic circuits by means of SPICE. | 5 |
L'esame consiste in una prova scritta e in un colloquio orale. Per la prima sessione di esami, gli studenti possono scegliere di sostituire la prova scritta con la stesura di un elaborato progettuale svolto tramite SPICE.
Durante il corso, sono previste delle prove in itinere da svolgere a casa mediante simulatore circuitale.
Non sono previste prove di fine corso.
La prova scritta consiste nell'analisi di un circuito retroazionato e nella progettazione della sua rete di compensazione. La durata della prova scritta è 2 ore.
Domande tipiche di un colloquio orale (elenco non esaustivo):