[SI-LIST] Re: Negative Resistance of Crystal Oscillators
- From: Parthasarathy Sampath <parthsv@xxxxxxxxx>
- To: "Moeller, Merrick" <mmoeller@xxxxxxxxxxxxxxx>
- Date: Tue, 20 May 2003 15:24:02 -0700 (PDT)
Hi Merrick,
Thanks for the answer. I have few more doubts which I
hope you can clear.
The negative resistance is due to crystal oscillator.
If so why do I need to replace crystal with current
source.
How will oscillations occur and also different
impedance as crystal offers at different frequencies
when I replace crystal with current source?
I am modelling crystal as a parallel resonant
circuit in Hspice.
Thanks in advance,
Regards,
Partha!
--- "Moeller, Merrick" <mmoeller@xxxxxxxxxxxxxxx>
wrote:
> Hi,
> Place a unit current source in place of your
> crystal, Include a parallel cap to account for Co.
> Wideband AC simulation. Plot Real[Z],you should see
> Neg R at your
> frequency of intrest. If you are working with 3rd OT
> you will see a crossing point prior to your
> frequency.
>
> Hope that helps. If you have any questions I should
> be
> able to help.
>
> Merrick M. Moeller
>
>
> -----Original Message-----
> From: Parthasarathy Sampath
> [mailto:parthsv@xxxxxxxxx]
> Sent: Tuesday, May 20, 2003 2:48 PM
> To: si-list@xxxxxxxxxxxxx
> Cc: analogcmos_vlsi@xxxxxxxxxxxxxxx
> Subject: [SI-LIST] Negative Resistance of Crystal
> Oscillators
>
>
>
> Hi all,
> I need to make certain measurements on crystal
> oscillator ckt. The closed loop has a crystal
> oscillator with Invertor as feedback to provide 360
> deg phase shift.
> One measurement is to measure Negative resistance
> in open loop simulation.
> Is it possible to measure negative resistance of
> the
> oscillator in open loop. If so how will I have to
> proceed?
>
> Thanks in advance
>
> Regards,
> Partha!
>
>
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