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Simulators >> RF Simulators >> QVCO test buffer match
https://designers-guide.org/forum/YaBB.pl?num=1200553068

Message started by yhq0413 on Jan 16^th, 2008, 10:57pm

Title: QVCO test buffer match
Post by yhq0413 on Jan 16^th, 2008, 10:57pm

I designed a QVCO, the frequency is 4G,now I need a test buffer to evaluate it
Does the test buffer need to match 50Ω? I know the test buffer for LNA must match 50Ω?I think the QVCO test buffer need not,but I am not sure.
Does the buffer that does not match 50Ω affect the phase noise and other performances?

Title: Re: QVCO test buffer match
Post by Stefan on Jan 17^th, 2008, 12:21am

How do you want to measure it and WHAT do you want to measure ?

For amplitude performances (gain, swing, etc.) a matching to your measurement equipment is important,
for time measurements (frequency, PN,etc.) it's unimportant as long as you've got a sufficient output swing and no reflections ...

(That should answer your question.)

Title: Re: QVCO test buffer match
Post by yhq0413 on Jan 17^th, 2008, 2:39am

for time measurements (frequency, PN,etc.) it's unimportant as long as you've got a sufficient output swing and no reflections ...

“no reflections” means match,but you say match is unimportant,why?