Broadcast band RF amplifier


Posted on Dec 29, 2012

The circuit has a frequency response ranging from 100 Hz to 3 MHz; gain is about 30 dB. Field-effect transistor Ql is configured in the common-source self-biased mode; optional resistor Rl sets the input impedance to any desired value. Commonly, it will be 50 ohms. The signal is then direct-coupled to Q2, a common-base circuit that isolates the input and output stages and provides the amplifier's exceptional stability. Q3 functions as an emitter follower, to provide low output impedance (about 50 ohms). For higher output impedance, include resistor R8.


Broadcast band RF amplifier
Click here to download the full size of the above Circuit.

It will affect impedance according to this formula: R8 - Rout-50. Otherwise, connect output capacitor C4 directly to the emitter of Q3.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

6Meter kilowatt amplifier
FM carrier current remote speaker system
Coprocessor-socket-debugger
switches Wiring a SPDT Relay
Vire 7 Starter GeneratorCircuits
heater with ckm005 microcontroller
Subwoofer Filter Circuit
Simple PIC USB Interface Circuit
1kHz square wave signal source circuit
Telephone control automatic lamp circuit 1



Top