The reference current in the BiCMOS folded cascode amplifier in Figure 13.20 is Iref = 200 µ A and the circuit bias voltages are ±10 V. The MOS transistor parameters are the same as in Problem 13.42. The BJT parameters are β = 120 and VA = 80 V. (a) Determine the small-signal differential voltage gain, (b) Find the output resistance of the circuit, (c) If the capacitance at the output node is 5 pF, determine the unity-gain bandwidth of the amplifier.
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