Designa a BPF that has a cut-off frequency of 200 Hz and 50 kHz and with a midband gain of 10 dB.  Resistor values must be no larger than 200 k-Ohms but the input resistance must be high as possible.  Find R4 if R3 = 50 K-Ohms.  Find C1 if R1 is 200 kOhms and C2 if R2 is 10 kOhms

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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.