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Re: [Discuss-gnuradio] FFT Measurement on High Impedance IC's with LFRX
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From: |
Johnathan Corgan |
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Subject: |
Re: [Discuss-gnuradio] FFT Measurement on High Impedance IC's with LFRX |
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Date: |
Sun, 29 Apr 2012 11:58:12 -0700 |
On Sun, Apr 29, 2012 at 11:46, Jasper Kanbier <address@hidden> 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