The differential amplifier in Fig. P9.57 utilizes a resistor RSS to establish a 1-mA dc
Chapter 9, Problem 9.57(choose chapter or problem)
The differential amplifier in Fig. P9.57 utilizes a resistor RSS to establish a 1-mA dc bias current. Note that this amplifier uses a single 5-V supply and thus the dc common-mode voltage VCM cannot be zero. Transistors Q1 and Q2 have k nW/L = 2.5 mA/V2 , Vt =0.7 V, and = 0. (a) Find the required value of VCM . (b) Find the value of RD that results in a differential gain Ad of 8 V/V. (c) Determine the dc voltage at the drains. (d) Determine the single-ended-output common-mode gain VD1/VCM . (Hint: You need to take 1/gm into account.) (e) Use the common-mode gain found in (d) to determine the change in VCM that results in Q1 and Q2 entering the triode region. Q1 Q2 RD RD VDD 5 V RSS VCM 1 k vid 1 mA vod Figure P9.57 9.
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