hi michael, we haven't characterized these adc08-5000 adc above 2.5 GHz.
it would be pretty easy for you to do it. but my prediction is that these adc's will work extremely poorly, if at all, from 5 to 7.5 GHz. they will have extremely low gain, huge ripples in that passband, and each adc will have different characteristics... for frequency response up to 2.5 GHz: see sections 8, 9 and 10 of https://casper.berkeley.edu/wiki/ADC1x5000-8 figure 7.1 of https://casper.berkeley.edu/wiki/images/1/19/Ev8aq160.pdf see figure 4 of http://www.worldscientific.com/doi/pdf/10.1142/S2251171714500019 or figure 2 of https://casper.berkeley.edu/memos/adc08-5000-char.pdf best wishes, dan On Fri, Mar 6, 2015 at 7:13 AM, Michael D'Cruze < [email protected]> wrote: > Hello everyone, > > > > We are considering using one of the 5 GS/s ADCs in our C-band system. We > would like to directly sample the C-band signal (which we would set at > 5—7.5 GHz using an anti-aliasing filter, so we’d operate in the third > Nyquist zone), however many of the documents available on the wiki > (including the advice of people currently using them) indicate this may be > beyond the sampler’s ability (6dB attenuation at 2.5 GHz). We wondered if > anyone had tried to drive these samplers at such high frequencies, and > ideally could send us some plots so we know what we’re dealing with? > Otherwise we’ll have to mix in analogue and we really want to avoid that if > we can… > > > > Many thanks > > Michael >
