The differential amplifier shown in Figure P11.60 has a pair of pnp bipolars as input devices and a pair of npn bipolars connected as an active load. The circuit bias is \(I_{Q}=0.2 \mathrm{~mA}\), and the transistor parameters are \(\beta=100\) and \(V_{A}=100 \mathrm{~V}\).

(a) Determine \(I_{0}\) such that the dc currents in the diff-amp are balanced.

(b) Find the open-circuit differential-mode voltage gain.

(c) Determine the differential-mode voltage gain if a load resistance \(R_{L}=250 \mathrm{k} \Omega\) is connected to the output.

Transcribed Image Text:

V+ Q1 Q2 Q3 Figure P11.60 10 - 1 RL