High frequency amplifier

[slminder]

i want to design high frequency amplifier

Input Impedance >1kOhm
Output Impedance <200ohm
Gain >40dB
BW 100Hz-20KHz

it's helpful to give some instruction how to design this cct

 

[Audioguru]

100Hz to 20khz are not high frequencies. They are upper audio frequencies.
a voltage gain of only 40dB is only 100. A single transistor can do the circuit.

 

[FvM]

A single transistor can do the circuit.

A second (e.g. common collector circuit) would be needed to provide the low output impedance. Using the two transistors in an overall feedback circuit gives lowest distortion.

 

[slminder]

how can i do it?

 

[Audioguru]

how can i do it?

Learn about how a transistor works then design the extremely simple circuit.
Try a single common-emitter transistor.
Then try two transistors with overall negative feedback.