Joel Kolstad wrote:

Could someone point me in the direction of how you might go about flattening
the frequency response of a wideband amplifier MMIC? I'm looking at something
like the Watkin-Johnson ECG003 (http://www.wj.com/pdf/ECG003.pdf) and noticing
that the response drops a little over 2dB from 500MHz to 2.5GHz. Assuming
that I've got plenty of SNR, component count isn't a big deal, and I don't
mind tweaking trimmers, how might I go about flattening that respone to, say,
0.5dB or better across that range? Or is it just not very practical?

Thanks,
---Joel Kolstad



A lead-lag filter with the pole out beyond 2.5GHz may do it for you, but
I have no idea how you'd actually implement it.

Ditto for cleverly placed stubs.

And don't call me when the next batch has slightly different
characteristics, or when the one you have varies with temperature.

I recall someone writing about this in QEX quite a while back -- it was
his first time designing an IF for a radar, and it had to be WIDE band.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com