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How to increase the output impedance of a NMOS current source?

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urian

urian

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I only know two ways,such as increasing the L of NMOS and using cascode structure,I wonder whether there is more way?


Regard
urian
 

You can try using a different topology, such as Wilson or Widlar current mirrors.
Or just a simple cascode.
 
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    urian

    urian

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There are also methods involving series feedback, the most common being source degeneration. Look for example also for regulated cascode.
Of course cascoding is essentially series feedback too.
 
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    urian

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thanks, sharonma, but I think Wilson is the same as cascode when refer to output impedance.

hi,kgl,you really remind me of the source degeneration,thanks a lot
 

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