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You have ramps that are not matched in their dV/dT rate, due to differences between

NPN and PNP and NPN-NPN PNP-PNP matching. The cap size smaller was simply to

get a triangle wave, eg. to prevent the current sources from running into their supply

rails and no longer function as linear V controlled current sources.

I may have missed it but what matching spec do you want for the source/sink current

generators ? And frequency range.....And I still dont understand hold specs.