[SI-LIST] Re: Crystal Oscillator Overtones.
- From: Parthasarathy Sampath <parthsv@xxxxxxxxx>
- To: "Moeller, Merrick" <mmoeller@xxxxxxxxxxxxxxx>
- Date: Fri, 30 May 2003 15:06:24 -0700 (PDT)
Yes, it does include 1nf cap in series with tank
circuit.
First i test for ac gain whihc inlcudes the invertor
and crystal oscillator and once i achieve required
gain with correct inverter size, I go for transient
analysis to make other measurements.
Another peculiar thing is, with tank ckt freq twice
the 3rd overtone, I have good ac gain, while in
transient analysis, the ouput dies out.
Regards,
Partha
--- "Moeller, Merrick" <mmoeller@xxxxxxxxxxxxxxx>
wrote:
> First, are you using a decoupling cap from
> your tank inductor to ground? Second what
> type of simulation are you running...
> A negative R simulation is good in this
> case you should see your negative R cross
> 0 at your tank resonant frequency.
>
> Merrick
>
>
> -----Original Message-----
> From: Parthasarathy Sampath
> [mailto:parthsv@xxxxxxxxx]
> Sent: Friday, May 30, 2003 3:01 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: Crystal Oscillator Overtones.
>
>
> > My question is at freq above tank corner freq,
> the
> > tank becomes inductive and whole circuit becomes
> > imbalanced.
> 'The above statement should be "At freq below tank
> frequency, the tank should become inductive and the
> whole circuit becomes inductive with one load of
> crystal being capacitor and other inductor(due to
> tank)".
>
>
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