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?
With a finite frequency beat signal one gets a periodic modulation of
the phase difference between the 2 inputs.
Or do you mean the unfiltered IF output signal?
The low pass filtered IF signal is of more interest as it ideally
doesn't contain components at the sum frequency (nor at the RF and LO
frequencues).
Bruce
Cheers,
Magnus
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