In BiCMOS technology, MOS source followers can be used to drive a bipolar differential pair to reduce the average current flowing in the stage input leads. See Fig. 6.64. Calculate the input-referred random offset voltage of this structure. Assume nonzero mismatch occurs in the following parameters: the thresholds of the MOS transistors, the W/L of the MOS transistors, the bias currents, the saturation currents of the bipolar transistors, and the load resistors. Ignore the body effect.

Fig. 6.64:

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VDp = Vcc R2 R1 VOD M4 Мз Q2 VID IBIAS ITAIL IBIAS -Vss = -VEE T.