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Q#1 Amplifiers GATE EC 1992 MSQ +2 marks -0 marks

The transistors in the differential amplifier shown in figure are identical with  and  ohms at 1mA collector current. The circuit has a Common Mode Rejection Ratio (CMRR) of 100.         

(a) What is the differential gain  of the circuit?

(b) What is the common mode gain of the circuit?

(c) If DC voltage of 1010 mV and 990 mV are allied to inputs 1 and 2 respectively with reference to ground, what will be the output voltage___mV?

(a) Differential gain = 20

(b) Common mode gain = 0.2

(c) Output voltage = 800 mV

(c) Output voltage = 600 mV

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