Response to the following problem:
Consider the BJT differential amplifier when fed with a common-mode voltage VCM as shown in Figure. As is often the case, the supply voltage VCC may not be pure dc but might include a ripple component vr of small Amplitude and a frequency of 120 Hz . Thus the supply voltage VCC may not be pure dc but might include a ripple component vr of small amplitude and a frequency of 120 Hz .Thus the supply voltage becomes VCC +vr . Find the ripple component of the collector voltages, vC1 and vC2, as well as of the difference output voltage vod ≡ vC2 -vC1. Comment on the differential amplifier response to this undesirable power-supply ripple.
