1
\$\begingroup\$

Is input resistance always a small signal parameter or is also defined for large signal model of any circuit? How do we model any circuit after we calculate its input/output resistances?

\$\endgroup\$
1
\$\begingroup\$

For defining or calculating the input impedance you have to discriminate berween DC and AC. For DC signals you can define the voltage-to-current ratio for small as well as also for large signals (where the voltage-to-current relation is non-linear).

However, for AC signals the input impedance is defined for small signals only because a voltage-to-current ratio can be meaningful defined for identical (sinusoidal) waveforms only. Because linearity is not ensured for "large signal operation" the term "impedance" applies to small-signal operation only.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.