[time-nuts] Triangle Waves

Magnus Danielson magnus at rubidium.dyndns.org
Wed Feb 3 20:12:27 UTC 2010

Bruce Griffiths wrote:
> Magnus Danielson wrote:
>>> When both the RF and LO ports are saturated, the mixer output 
>>> waveform depends on how the IF port is terminated.
>>> The output is indeed approximately triangular with your IF port 
>>> termination method when both the RF and LO ports are saturated.
>> My experience says that it also depends on the relative phase... so it 
>> shifts between approx falling saw to approx tri to approx rising saw 
>> to approx falling saw over a 360 degree beat period. Kind of 
>> comforting to see this shift occurring slowly on the scope.
> Your description is for the beat frequency output or for the input 
> signal waveforms?

I am describing the beat frequency waveform.

> With a finite frequency beat signal one gets a periodic modulation of 
> the phase difference between the 2 inputs.

Indeed, tuning offset oscillator will provide a suitable phase sweep rate.


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