Oops, I noted a sign error in the previous diagram. The attached seems better...
On Sat, Dec 23, 2017 at 4:46 PM Stephan Sandenbergh <[email protected]> wrote: > Hi All, > > Consider the following very common scenario: A perfect RF signal is > heterodyne down-converted to baseband using an offset oscillator. Let's > assume this oscillator has x(t) = xo + yot. This produces a time and > frequency offset baseband signal. Then, this baseband signal is coherently > ADC sampled using that same offset oscillator. > > What would the effect of this coherent ADC sampling be? > > See attached diagram. Here I assumed the ADC timebase is a time-dependent > function of the oscillator offset. However, it feels like I'm making a > logic error? I can't remember ever seeing anyone accounting for the ADC > time-base errors in coherent heterodyne down-converter stages. I have > limited experience though. > > Regards, > > Stephan. > > >
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