Maker Pro
Maker Pro

NPN PNP coupling capacitor

What is the pupose of the circuit?
It looks to me to be a RF amplifier with Q! setting the current through Q2. The capacitors are to bypass RF current so to smooth the supply.
What are the component values?
 
What is the pupose of the circuit?
It looks to me to be a RF amplifier with Q! setting the current through Q2. The capacitors are to bypass RF current so to smooth the supply.
What are the component values?
Hello, Duke, sorry for late answer, this is an form of bisasing on RF DESIGN
 
Q1, R1, R2, and R5 form a constant current source to bias Q4 into its linear operating region without lowering the circuit's input impedance. C2 and C3 are bypass/decoupling capacitors to prevent the input RF signal from modulating the bias current and possibly forming an oscillator.

ak
 
Last edited:
Q1, R1, R2, and R5 form a constant current source to bias Q4 into its linear operating region without lowering the circuit's input impedance. C2 and C3 are bypass/decoupling capacitors to prevent the input RF signal from modulating the bias current and possibly forming an oscillator.

ak
Thanks a lot man , now i understand.
 
Top