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What's the typical amplitude of the crystal oscillator?
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kolarbear



Joined: 17 Feb 2006
Posts: 48
Helped: 1
Post07 Aug 2006 1:49   

gmcrit
I mean the output waveform?Can they get to supply of the circuit?
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Post07 Aug 2006 1:49   

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jfyan



Joined: 03 May 2006
Posts: 199
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Location: shanghai,china
Post07 Aug 2006 15:27   

Re: What's the typical amplitude of the crystal oscillator?
kolarbear wrote:
I mean the output waveform?Can they get to supply of the circuit?

hi,
the typical amplidute of Xtal is about (2I/gmcrit), where I is the bias current, gmcrit is the critical start-up gm.
to the more detail analysis you can refer to vittoz's jssc paper in the yesr 1989.
jeff.yan
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shwoo



Joined: 19 Apr 2006
Posts: 107
Helped: 13
Post08 Aug 2006 1:52   

Re: What's the typical amplitude of the crystal oscillator?
It depends on the oscillator topolgy.
If you use CMOS gates, you can get rail to rail swing
when the frequency is not too high.
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biff44



Joined: 24 Dec 2004
Posts: 1834
Helped: 244
Location: New England, USA
Post08 Aug 2006 16:16   

Re: What's the typical amplitude of the crystal oscillator?
Most of the bipolar oscillators I have seen run a volt or two p-p. At some point you overdrive the xtal and you get added loop loss and strange modes showing up, so it is not good to overdrive them.

Same with most resonators, like SAWs and YIGs, overdrive them and you get garbage.
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