The bias voltages for the diff-amp shown in Figure 11.30 are V+ = 5 V and V− = −5 V. A load resistance of RL = 250 kΩ is capacitively coupled to the output. The transistor parameters are β = 120, VA1 = VA2 = 90 V, and VA3 = VA4 = 60 V. (a) Determine the bias current IQ that will produce a differential-mode voltage gain of Ad = 1000. (b) If VEB(on) = 0.6 V, what is the maximum common-mode voltage that can be applied such that all transistors are biased in the forward-active mode?
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