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1. A current-mirror-loaded NMOS differential amplifier operates with a bias current I of 200 μA. The NMOS transistors are operated at VOV = 0.2 V and the PMOS devices at /VOV/ =0.3 V. The Early voltages are 20 V for he NMOS and 2 V for the PMOS transistors. Find Gm, Ro, and Ad . For what value of load resistance is the gain reduced by a factor of 2? 2. This problem investigates the effect of transistor mismatches on the input offset voltage of the current-mirror-loaded MOS differential amplifier of Fig. 9.32(a). For this purpose, ground both input terminals and short-circuit the output node to ground. (a) If the amplifying transistors Q1:and Q2:exhibit a W/L mismatch of ?
(W/L)A, find the resulting short-circuit output current and hence show that the corresponding VOS is given bywhere VOV is the overdrive voltage at which Q1:and Q2:are operating.
(b) Repeat for a mismatch _(W/L)M in the W/L ratios of the mirror transistor Q3:and Q4:
to show that the corresponding VOS is given by where VOV is the overdrive voltage at which Q1: and Q2:are operating. (c) For a circuit in which all transistors are operated at /VOV /* = 0.2 V and all W/L ratios are accurate to within ±1% of nominal, find the worst-case total offset voltage VOS.
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