BJT amplifier & small-signal concept

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Presentation transcript:

BJT amplifier & small-signal concept Lecture 8

Preview Basic characteristics of BJT amplifiers DC and ac analysis & equivalent circuits Small-signal hybrid-π equivalent circuits Small-signal voltage gain, input resistance & output resistance Common-emitter amplifiers dc & ac load lines

Linear analog amplifier

Notation

Basic characteristics of an amplifier

Basic characteristics of an amplifier (cont’d)

Basic BJT amplifier

Graphical analysis of BJT amplifiers

Graphical analysis of BJT amplifiers (Cont’d)

Analysis of BJT amplifiers

dc analysis and equivalent circuit

ac analysis and equivalent circuit

Small-signal hybrid-π equivalent circuit

Small-signal hybrid-π equivalent circuit (Cont’d)

Small-signal voltage gain

Input and output resistances

Example: dc circuit analysis

Example: dc circuit analysis (Cont’d)

Example: dc circuit analysis (Cont’d) -

Small-signal hybrid-π equivalent circuit with Early effect

Example: determine BJT amplifier parameters Determine the small-signal voltage gain, input resistance, and output resistance of the BJT amplifier circuit in previous example with the early effect. Assume that the early voltage is 50V.

Common-emitter amplifiers (with voltage-divider biasing & coupling capacitor)

Common-emitter amplifiers (with voltage-divider biasing & coupling capacitor)- Cont’d

Common-emitter amplifiers (with voltage-divider biasing & coupling capacitor & emitter resistor)

dc & ac load lines Dc load line is used to find Q-point Ac load line is used to determine graphically the operation of a BJT amplifier Dc and ac load lines are essentially different since capacitors appear as an open circuit for a de operation but a short circuit for an ac operation

dc load line

ac load line

Maximum output symmetrical swing

Saturation

Cutoff

Example: Calculate BJT circuit parameters Determine the small-signal voltage gain, input resistance, and output resistance of the circuit shown in attached Figure. Assume the transistor parameters are: β=100, VBE(on) =0.7V, and VA=100V

end

(a) Determine the small-signal hybrid- parameters rπ, gm, and r0 TQ8.1 In Figure 8.1, let β=150,VA=200V, VCC=7.5V, VBE(on)=0.7V, RC=15KΩ, RB=100kΩ, and VBB=0.92V. (a) Determine the small-signal hybrid- parameters rπ, gm, and r0 (b) Find the small-signal voltage gain Av Fig. 8.1