The bias voltages for the diff-amp shown in Figure 11.30 are \(V^{+}=5 \mathrm{~V}\) and \(V^{-}=-5 \mathrm{~V}\). A load resistance of \(R_{L}=250 \mathrm{k} \Omega\) is capacitively coupled to the output. The transistor parameters are \(\beta=120\), \(V_{A 1}=V_{A 2}=90 \mathrm{~V}\), and \(V_{A 3}=V_{A 4}=60 \mathrm{~V}\).

(a) Determine the bias current \(I_{Q}\) that will produce a differential-mode voltage gain of \(A_{d}=1000\).

(b) If \(V_{E B}(\mathrm{on})=0.6 \mathrm{~V}\), what is the maximum common-mode voltage that can be applied such that all transistors are biased in the forward-active mode?

Transcribed Image Text:

22 Q23 Q5 24 14 = HH 8mvd 2 CC RL 8mvd 2 2 Q2 vip2 ibl 8mvd + Figure 11.30 Signal ground +1