Let the NPN transistors have beta= 150 and Early voltage V A = 75V. Let the PNP
ID: 1847456 • Letter: L
Question
Let the NPN transistors have beta= 150 and Early voltage VA = 75V.
Let the PNP transistors have beta = 120 and Early voltage VA = 50V.
Use the Miller effect to estimate the break frequency of the dominant pole of the open-loop gain.
Notes:
Assume that Ic6 and Ic7 and equal when computing the transconductance of Q6 and Q7. (In practice, Ic7 will be ~ 2.1mA greater than Ic6 so as to provide a base current to Q3, but the error introduced by the assumption that the currents are equal is not large).
Include the base-emitter small-signal resistance rpi3 in parallel with r02 and r07 when computing the voltage gain of the differential pair with current-mirror load. Remember that rpi= beta/gm.
The output stage consisting of Q4, Q5, Q11, Q12, R7, and R8 is a unity-gain buffer for driving low-resistance loads. You may ignore it in computing the differential-mode voltage gain.
Explanation / Answer
If smaller R2 reduces stability why reduce it further with RL (RLRelated Questions
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