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about the pkg downbond inductor (Read 1847 times)

jeetchu New Member Offline Posts: 2	about the pkg downbond inductor Sep 22^nd, 2006, 6:01pm for a simple one stage rf amplifier,such as LNA or driver,downbond inductor is used as the emitter degeneration .how much effection with the degeneration inductor on the gain and linearity? I find the voltage gain is too sensitivity with the inductor value.the gain reduce 3dB when i set the indcutor from 0.5dB to 0.6dB.
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ACWWong

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Posts: 539
Oxford, UK

Re: about the pkg downbond inductor
Reply #1 - Sep 23^rd, 2006, 2:29am

Normally i would expect degeneration impedance increase of 20% to have the effect of reducing volatge gain by 1/1.2 (ie about -1.6dB) if gm*Zdegenertion>>1. Linearity would improve by a similar amount.

I think in your case you are having the additional impact of input mismatch (or at least change of input match) which is giving you the additional gain loss.

cheers
aw

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