Re: [Discuss-gnuradio] FFT Measurement on High Impedance IC's with LFRX

On Sun, Apr 29, 2012 at 11:46, Jasper Kanbier <jasperkanbier@wanadoo.nl> wrote:
> Hi,
>
> I am trying to do a FFT measurement on a Switched Capacitor Filter (MAX297)
> with the LFRX.
>
> However the LFRX's  50ohm impedance puts a high load on the filters output
> which causes all sorts of problems.
>
> Anyone with knowledge in electronics knows how to solve this??
>
> Typical load on the IC's output should be 10kilo ohms..

You could build an opamp or transistor buffer amplifier:

https://en.wikipedia.org/wiki/Buffer_amplifier

Johnathan

_______________________________________________
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio