ANALOG ELECTRONIC CIRCUITS 1. EKT 204 Basic BJT Amplifiers (Part 1). Analog Signals & Linear Amplifiers. Analog signals Natural analog signals: physical sense (hearing, touch, vision)
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Basic BJT Amplifiers (Part 1)
Block diagram of a compact disc player system
(a) Bipolar transistor inverter circuit; (b) inverter transfer characteristics
VBBGraphical Analysis & AC Equivalent Circuit
(C) Common-emitter circuit with time varying signal source in series with base dc source
(D) Common-emitter transistor characteristics, dc load line, and sinusoidal variation in base current, collector current, and collector-emitter voltage
(time-varying signals linearly related & superimposed on dc values)
Base on (5), left side of (7) is 0. So:
e.g. If dc current is 10 mA, the ac current (peak-to-peak) < 0.1 mA.
Using common-emitter current gain (β) parameter
ro = small-signal transistor output resistance
VA = early voltage
Textbook: Donald A. Neamen, ‘MICROELECTRONICS Circuit Analysis & Design’,3rd Edition’, McGraw Hill International Edition, 2007
Chapter 5:The Bipolar Junction Transistor
Chapter 6: Basic BJT Amplifiers
The circuit parameters in Figure are changed to VCC = 5V, R1=35.2kΩ, R2=5.83kΩ, RC=10kΩ and RS =0, β =100, VBE(on) =0.7V and VA =100V. Determine thequiescent collector current andcollector-emitter voltageand find thesmall-signal voltage gain.
Ans: ICQ = 0.21mA, VCEQ =2.9V, Av =-79.1)