how to increase the slew rate with source degeneration?

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wholx

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can someone explain how a source degeneration config works for increasing the SR?

if the circuit is composed of a differential pair followed by a common source amp then an output stage. a compensation capa is applied by connecting the Gate and Drain of the CS transistor. so the SR could be calculated as

SR = Vdsat(diff)*Wp2

where Wp2 is the sencond pole of the circuit.

in this case, how to use the source degeneration in the differential pair to increase the SR?
 

In the source config, the output impedence is 1/gm, which is really small resistance. So it can generate larger output current to increase SR
 

Are you sure by using the source degeneration in differential stage could increase SR? I think by increasing the second stage bias current, you could increase SR.
 

You can increase tail current because SR=I/C.
 

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