Microelectronics Circuit Analysis and Design

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1 Neamen Microelectronics Chapter 4-1 Microelectronics Circuit Analysis and Design Donald A. Neamen Chapter 4 Basic FET Amplifiers

2 Neamen Microelectronics Chapter 4-2 In this chapter, we will: Investigate a single-transistor circuit that can amplify a small, time-varying input signal Develop small-signal models that are used in the analysis of linear amplifiers. Discuss and compare the three basic transistor amplifier configurations. Analyze the common-source amplifier. Analyze the source-follower amplifier. Analyze the common-gate amplifier. Analyze multitransistor or multistage amplifiers. Design a two-stage MOSFET amplifier circuit.

3 NMOS Common-Source Circuit Neamen Microelectronics Chapter 4-3

4 Neamen Microelectronics Chapter 4-4 NMOS Transistor Small-Signal Parameters Values depends on Q-point ] [ ] ) ( [ ) ( 2 ) ( 2 DQ TN GSQ n o v i o DQ n TN GSQ n m gs d v i m I V V K r r I K V V K g v i g DS D GS D

5 Simple NMOS Small-Signal Equivalent Circuit Neamen Microelectronics Chapter 4-5

6 Neamen Microelectronics Chapter 4-6 NMOS Common-Source Circuit AC Small-signal A v V o V i g m ( r D) o

7 Problem-Solving Technique: MOSFET AC Analysis 1. Analyze circuit with only the dc sources to find quiescent solution. Transistor must be biased in saturation region for linear amplifier. 2. eplace elements with small-signal model. 3. Analyze small-signal equivalent circuit, setting dc sources to zero, to produce the circuit to the time-varying input signals only. Neamen Microelectronics Chapter 4-7

8 Common-Source Configuration DC analysis: Coupling capacitor is assumed to be open. AC analysis: Coupling capacitor is assumed to be a short. DC voltage supply is set to zero volts. Neamen Microelectronics Chapter 4-8

9 Neamen Microelectronics Chapter 4-9 Small-Signal Equivalent Circuit A v V o V i g m ( r o D )( i i Si )

10 Neamen Microelectronics Chapter 4-10 DC Load Line Q-point near the middle of the saturation region for maximum symmetrical output voltage swing,. Small AC input signal for output response to be linear.

11 Common-Source Amplifier with Source esistor Neamen Microelectronics Chapter 4-11

12 Neamen Microelectronics Chapter 4-12 Small-Signal Equivalent Circuit for Common-Source with Source esistor A v g 1 g m m D S

13 Neamen Microelectronics Chapter 4-13 Common-Source Amplifier with Bypass Capacitor Small-signal equivalent circuit

14 NMOS Source-Follower or Common Drain Amplifier Neamen Microelectronics Chapter 4-14

15 Neamen Microelectronics Chapter 4-15 Small-Signal Equivalent Circuit for Source Follower A v ( S o i 1 S ro i Si m g r )

16 Determining Output Impedance NMOS Source Follower O 1 g m S r o Neamen Microelectronics Chapter 4-16

17 Common-Gate Circuit Neamen Microelectronics Chapter 4-17

18 Neamen Microelectronics Chapter 4-18 Small-Signal Equivalent Circuit for Common Gate A v g ( m D L ) 1 g m Si A i I I O i ( D D L )( 1 g m g m Si Si )

19 Neamen Microelectronics Chapter 4-19 Comparison of 3 Basic Amplifiers Configuration Voltage Gain Current Gain Input esistance Output esistance Common Source A v > 1 TH Moderate to high Source Follower A v 1 TH Low Common Gate A v > 1 A i 1 Low Moderate to high

20 NMOS Amplifier with Enhancement Load Device Neamen Microelectronics Chapter 4-20

21 Cascade Circuit Neamen Microelectronics Chapter 4-21

22 Small-Signal Equivalent Circuit for Cascade Circuit Neamen Microelectronics Chapter 4-22

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