For an nmos differential pair with a common-mode


For an NMOS differential pair with a common-mode voltage VCM applied,as shown in Fig. 9.2,letVDD =VSS =1.0 V, k1= 0.4 mA/V2, (W/L)1,2 = 10, Vtn = 0.4 V, = 0.16 mA, RD = 5 kΩ and neglect channel-length modulation.

(a) Find VOV and VGS for each transistor.

(b) For VCM = 0, find VS ID1, ID2, VD1, and VD2.

(c) Repeat (b) for CM =+0.4 V.

(d) Repeat (b) for VCM =-0.1 V

(e) What is the highest value of VCM for which Q1: and Q2: remain in saturation?

(f) If current source requires a minimum voltage of 0.2 V to operate properly, what is the lowest value allowed for VS and hence for VCM?

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Science: For an nmos differential pair with a common-mode
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