Open main menu
Home
Random
Recent changes
Special pages
Community portal
Preferences
About Wikipedia
Disclaimers
Incubator escapee wiki
Search
User menu
Talk
Dark mode
Contributions
Create account
Log in
Editing
Current mirror
(section)
Warning:
You are not logged in. Your IP address will be publicly visible if you make any edits. If you
log in
or
create an account
, your edits will be attributed to your username, along with other benefits.
Anti-spam check. Do
not
fill this in!
== Practical approximations == For [[small-signal]] analysis the current mirror can be approximated by its equivalent [[Norton's theorem|Norton impedance]]. In [[large-signal]] hand analysis, a current mirror is usually and simply approximated by an ideal current source. However, an ideal current source is unrealistic in several respects: * it has infinite AC impedance, while a practical mirror has finite impedance * it provides the same current regardless of voltage, that is, there are no compliance range requirements * it has no frequency limitations, while a real mirror has limitations due to the parasitic capacitances of the transistors * the ideal source has no sensitivity to real-world effects like noise, power-supply voltage variations and component tolerances.
Edit summary
(Briefly describe your changes)
By publishing changes, you agree to the
Terms of Use
, and you irrevocably agree to release your contribution under the
CC BY-SA 4.0 License
and the
GFDL
. You agree that a hyperlink or URL is sufficient attribution under the Creative Commons license.
Cancel
Editing help
(opens in new window)