berryfan said:when I don't add signal to my chip,It shows about -50dbm signal at 1.8G.why?is my chip is osillating ,but it's so small.It's a differential amplifier.
who can tell me what's that?thanks.....
Parasitic oscillations at very high frequencies occur very often with rather small amplitudes (due to slew rate or other limiting effects).Audioguru said:An amplifier that oscillates will have its output at max level, not way down at -45dB.
I think it is picking up interference or noise.
berryfan said:LVW,"Parasitic oscillations at very high frequencies occur very often with rather small amplitudes (due to slew rate or other limiting effects). "
my slew rate is not good.it can cause oscillations?
berryfan said:thanks seriously LVW.
1.what kind of slew rate can be considered as bad slew rate.
2.is it difficult to identified in simulation about the oscillations of this reason (slew rate)
Added after 15 minutes:
and this signal is changing between -40~-50dbm.it's weird.
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