[time-nuts] Triangle Waves
Bruce Griffiths
bruce.griffiths at xtra.co.nz
Wed Feb 3 20:22:00 UTC 2010
Magnus Danielson wrote:
> 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.
>
Before low pass filtering it?
>> 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.
>
> Cheers,
> Magnus
>
Bruce
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