Measuring clock feed through Switched capacitor circuit

[analogdesigngiga]

Hi,

Can anybody help me how to measure non idealities in a simple switched capacitor circuit in cadence.

1) measuring clock injection
2) measuring the resistance offered by the switch

Thanks
satya

 

[dick_freebird]

I'd suggest using a FFT (calculator) on the output and
look at the clock frequency and multiples of it. With some
realism as far as load and source parasitics, because your
IC switched capacitor circuit devices are liable to be much
smaller than circuit board or test equipment impose, so
these may dominate the measurement. You probably want
to get from an output clock noise amplitude, to a charge
impulse number (which would be better characterized by
a series V=0 source and an integral of its single pulse current
(which you might do by a cccs, integrator cap and reset
switch depending off that vdc source's current).

Resistance ought to be rather obvious.