Differential Mode Gain of a Circuit

Question

Differential Amplifier Problem. Body effect can be neglected, but channel-length modulation should be included. Assume the current mirror is designed for a 1:1

mirroring ratio.

1. Calculate the differential-mode gain of the circuit.
2. Calculate the common-mode gain of the circuit.
3. Calculate the common-mode input range, which is the common-mode input DC voltage range over which all devices remains in saturation.

Assume these parameters for all transistors:

• |Vt|=0.5 V
• |Veff|=0.2 V
• gm=1 mA/V
• ro=15 kΩ

Summary

This question belongs to electronics engineering and discusses about differential amplifier problem.

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