I looked for this answer but was unsuccessful so I want to ask the experts here. I have configured an op amp in non-inverting mode (the first in a chain of 3 stages). It is for amplifying extremely low level noisy signals so I'm using lower resistor values. The input resistor is a 100ohm and the feedback resistor is 3K ohms. I'm feeding the circuit on the bench with a sine wave from my signal generator which has an output impedance of 50ohms and a minimum level of 4mV. I need to go lower to about 5uV minimum. The generator increases in 1mV increments.
My question is how should I configure a voltage divider in order to divide this signal down to 5uV (minimum) and maintaining a 50ohm impedance match. I need to measure the output of the entire amplifier chain while knowing what level is going in versus what level is coming out. Hope this makes sense and hope I've included all needed info. Thanks for the help. FJ