Why RF mixer circuit has DC bias series with a resistor?

[dwang_w]

rf stimullus

i don,t know rf design, i see a rf mixer ciucuit, it,s dc bias series with a resistor ,why? 2.4G sin stimulus with a 50 oumu resistor and 10p capacitance, who can explain it

 

[dwang_w]

Re: rf stimullus

i want to learn rf ,but don,t know how to begin, who can figure out

 

[hrkhari]

Re: rf stimullus

Basically the 50Ohms of resistor would be for input matching and the capacitor serves as a dc block from the input signal.

Rgds