M1P3 (BJT AC ANALYSIS)

Current-controlled source

A BJT operating in the active region realizes a __ (IC controlled by IB).

Small signal

An AC input riding on the DC quiescent point is called a __.

Quiescent DC value

VBE(t) equals a __ (VBEQ) plus the small-signal AC component vbe(t).

Distortion

If the AC signal vBE(t) becomes too large, __ will occur.

Exponential

Since IC = βIB and IB(t) is exponential in VBE, IC is also __.

Equivalent circuit model

AC analysis first requires using a proper __.

Linearize

Since only a small signal is needed, the exponential BJT model can be __ at the Q-point.

re

The small-signal parameter defined as dVBE/diE evaluated at IE=IEQ is called __.

Vt/IEQ

The small-signal resistance re is calculated as __.

Resistor

For small-signal AC analysis, the base-emitter diode behaves like a __.

(b+1)re

In the re model, input resistance Rin equals __.

bre

Since β ≫ 1, input resistance Rin simplifies to __.

Output conductance

The parameter 1/ro represents the BJT's __.

ro

The small-signal output resistance modeling IC's change with VCE is called __.