I'm looking for help/advice designing an impedance matching circuit. I
am trying to measure noise (PSD) across a resistor, I have a 500 Ohm
resistor that i need to match to the input of a preamplifier with an
input impedance of 100 MOhm.

This would be quite easy if I only wanted it to be matched for one frequency but I need it to be matched for a wide range of frequencies, specifically 0-100kHz.

I have found some information which states that broadband matching requires 4 reactance networks, unfortunately it doesn't give any information on how to calculate their magnitudes.

Any advice on this matter would be most appreciated.

Thanks,

Karl

This would be quite easy if I only wanted it to be matched for one frequency but I need it to be matched for a wide range of frequencies, specifically 0-100kHz.

I have found some information which states that broadband matching requires 4 reactance networks, unfortunately it doesn't give any information on how to calculate their magnitudes.

Any advice on this matter would be most appreciated.

Thanks,

Karl