[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




More information about the time-nuts mailing list