Resistor Parasitic Capacitance and RF Operating point

[fuseless]

As a reference to my question; I know that a 10K ohm resistor that has a parasitic capacitance of .3pF at 200MHz will have a actual impedance value of 2.564K ohms. If this resistor is used in a bias network for an RF amplifier, how does this shift in resistance effect the RF operating point? What is the RF operating point? I know what the DC operating point is but I don't know what the RF operating point is.

 

[ronsimpson]

You did not post your circuit, so my answer is not as good. Assume this resistor pulls the Base of a transistor up, the DC and the average voltage of the AC are the same. The RF will see a 0.3pF cap to the supply so some of the signal may be attenuated.

The RF operating point does not change because of the 0.3pF.

 

[fuseless]

Thank you ronsimpson, your answer is fine...

 

[KeepItSimpleStupid]

I can tell you that in some instances mounting a resistor on it;s side will reduce parsitic inductance and three resistors in series may have lless parasitic inductance than a single value. Tidbit.