[time-nuts] AM vs PM noise of signal sources

jimlux jimlux at earthlink.net
Sun Jan 7 12:26:34 EST 2018

On 1/7/18 8:05 AM, Arnold Tibus wrote:
> Am 07.01.2018 um 16:33 schrieb jimlux:
>> On 1/6/18 6:12 PM, Dana Whitlow wrote:
>>> One point about oscillator design I've not yet seen mentioned is 
>>> this: the
>>> limiter
>>> must not degrade the resonator Q when in action.  Hence, a pair of 
>>> diodes
>>> connected in parallel back to back, across a shunt resonator, would 
>>> be a bad
>>> thing to do from the perspective of low phase noise. A differential
>>> amplifier
>>> that limits by running out of current on peaks, driving a shunt 
>>> resonator,
>>> is
>>> a much better way even though one pays a price in having more transistor
>>> noise in the circuit.
>>> I've long wondered if a very slow AGC might avoid the nonlinear 
>>> mechanisms
>>> issue except, of course, for things happening within the AGC loop's
>>> bandwidth.
>> That's the Wein bridge stabilized by a light bulb, popularized by 
>> Messrs Hewlett and Packard a while ago.
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> Hello everybody, excuse me please,
> but I see quite often mentioned the 'Wein bridge'. (Wein in german is 
> 'vino' or 'wine' ;-)
> Not of real technical importance, but shouldn't this not be correctly 
> called a 'Wien bridge'?
> As I know that this tricky circuit was developed by Max Wien in 1891.
> Max Karl Werner Wien was a German physicist and the director of the 
> Institute of Physics at the University of Jena at that time.
>   (sorry, I am a nut ;-)  )

Ah yes. And I imagine then that the pronounciation should be in english 

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