[time-nuts] xtal oscillator phase noise
Henk ten Pierick
henk at deriesp.demon.nl
Tue Jan 1 07:24:37 EST 2008
On Dec 30, 2007, at 3:42, Bruce Griffiths wrote:
> The 30dB/decade phase noise slope could be the result of the effect of
> low pass filtering a power supply or reference source that has
> significant flicker noise.
The reference used is an ADR455. I have not seen references
significant better. Suggestions?
> Lack of local RF feedback and /or high dc gain from base to
> collector in
> BJT buffer stages can produce significant flicker phase noise.
I have now doubled the dc voltage for the oscillating transistor for
the reduction of junction capacitances. It had no result on phase noise.
Is low hfe better for phase noise?
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