[tINY]

Originally Posted by Matt Syson

Hi
An R-2R attenuator would not have constant input and output impedances so would vary depending on the amplifier and source impedances. It would also be switch inefficient as you would need many more steps to get say 1 dB resolution over a 60 - 70 dB range. By all means post how it is done if you can manage it.
Matt S

Using a 16 rung r2r ladder, 9 output tap positions and 5 ground taps I can get this.

This is assuming that Zout of the source is 0 and Zin of the amp is infinate. Imp scaler is the input impedance of the attenuator and the input impedance of the amp would be in series with 2*R. It might work pretty well if you can find an R2R ladder where R=200-500ohms.....



-tINY