Re: Startable Oscillator

On Wed, 9 Sep 2009 01:29:11 -0700 (PDT), Kolja
<ksulimma@xxxxxxxxxxxxxx> wrote:


Not actually minimum delay, but a very precise delay. I assume that precise
delays are easier to achieve for small delays, but we can handle any
delay as long as it is well known.

All edges of the oszillation must occure at known points in time relative
to the rising edge of the trigger. They are preferably evenly spaced,
but that is not essential.

How about feeding the trigger directly to one input of a very fast XOR
gate and using a 100-200 ps delayed version of the trigger on the
other input to generate a 100-200 ps glitch at the output. Feed this
pulse to the 2.5 - 5 GHz oscillator tank circuit and the oscillator
would start to oscillate at full amplitude with a known phase. A
longer pulse might be acceptable, if some useful harmonics will hit
the resonant frequency.

The oscillator amplifying element would initially have to be in class
C to prevent any oscillation due to thermal noise. Also some
precaution is needed to prevent oscillation due to the power up
transient.

After all, there is not much difference between an oscillator that
does not oscillate or an amplifier that oscillates :-)

Paul

.

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