Given the diferrential amplifier with a constant-current source at the emitter (instead of the resistor RE), Assume Q1, Q2, and Q3 are identical transistors with β=hfe=100 and VBE=0.7V. (a) Determine Io, Ie1, and Ie2. For DC Analysis: Ie1=Ie2 due to symmetry (b) Determine hie1 and hie2. (c) Determine the differential gains Ads (for single-ended) and Add (for double ended).

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Multistage Amplifier

The multistage amplifier is generally a voltage or power amplifier. The multistage amplifier has a number of single stage amplifier that are cascaded together. Since a single stage amplifier output is not useful, they are being replaced with multistage amplifiers or multistage transistor amplifiers. The multistage amplifier are used where the gain required is high or the input signal is very small such that only a single stage amplifier cannot amplify it.