Figure 5 shows the circuit diagram for a two-stage amplifier. You may assume that the parameters are B= 0.025 A/V², threshold voltage Vi 0.6 V, and VA= 10 V for each transistor, and Cs is negligible small for both Mi and M2. All other values are shown beside the schematic. (a) What kind of configuration is used for the 2 stages amplifier? (b) What kind of amplifier is Mi part of ? and what about M2? (c) Calculate the DC IDs for Mi and M2. (d) Calculate gm and ro for M1 and M2. Draw the combined small-signal equivalent circuit suitable for mid band frequency analysis for the entire amplifier. State any assumption. (e) (f) Determine the numerical values for: (i) Voltage gain of the entire amplifier. (ii) input resistance of the entire amplifier.

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A: Types of coupling  Transformer coupling  Impedence coupling  RC coupling  Direct coupling

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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.