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Help calculating the output Z of a mosfet constant current sink please...

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Hello,

I'm posting my question here following a recommendation from an inmate at tube DIY. I'd appreciate if a kind inmate would provide me with the formula for calculating the output impedance of the sink in the tail of the differential input stage above (eg Z as seen from the tubes). I have browsed through various papers on the web but they are more intented to EE students and i don't quite understand them.

I need a ballpark value to check if the rk >> RL (XL in my case) requirement for the diff pair is met at all frequencies.

Thanks a lot!

Joris in Quebec city


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