>
>
> call it a QSD.
Actually it is a IQSD (Integrating Quadrature Sampling Detector). In regular
sampling, the signal is captured by taking snapshots at relative short time
(Dirac comb). For a QSD the signal is integrating in 0.25-0.5 of the period
of the sampling frequency. When playing with a Spice model, this effect is
observable.
Another interesting observation is that when a differential op amp is used,
it needs to be fast enough (have a GBW>30MHz), otherwise the QSD will have
conversion losses (for the SDR-1000 INA163, the model showed 17dB conversion
loss). Maybe this effect is also a serious contributor to the performance
degradation at higher bands ?
Guido
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