Modify the previous design by adding only another identical NMOS M2 to the circuit to further increase the voltage gain and the output impedance at the same time. Draw the resulting circuit and explain how it works. Describe a possible application for the new circuit? State all the assumptions and justify your choice. a) Derive a formula for the output resistance of the current mirror in Figure 4 and show that this circuit has unbalanced current between the two arms. Draw the small signal equivalent circuit and state any assumptions made in the derivation Lout M3 M1 M2 Vss 0 V Figure 4

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Operational Amplifier

An operational amplifier also called op amp is an integrated circuit or analog circuit that takes input as a differential voltage and produces output as a single-ended voltage. It is an IC that can amplify weak electric signals.An op amp has one output pin and two input pins. The basic role of an opamp is to amplify the voltage difference between the two input voltages. It is also used in filtering or to perform mathematical operations or in signal conditioning.