Improved Current Mirrors - Transistors 101, episode 13
Improving on the current mirror The simple two-transistor current mirror that we saw last time has problems with its output impedance/voltage compliance and its accuracy. This video presents a collection of designs that improve on its limitations with a few extra components. Schematics are on the project GitHub: https://github.com/kennykb/kevins-cav... (Yes, I know it says episode 12. I use the same test circuit to evaluate these mirrors. TIMELINE 00:00 Intro 01:24 Emitter resistors 06:11 Widlar asymmetric mirror 07:35 Wilson mirror 11:32 Symmetric Wilson mirror 14:25 Matched transistor pairs 16:12 Outro CREDITS Music: “Light Sting” Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 4.0 License http://creativecommons.org/licenses/b... Images: "Barrie Gilbert and George Wilson" From "George Wilson, Barrie Gilbert speak at next Friday's engineering seminar." TekWeek, 2 February 1968. Obtained from https://vintagetek.org/barrie-gilbert/ "Robert Widlar" Courtesy of National Inventors' Hall of Fame Used by permission. DMMT5401 data sheet courtesy of Diodes Incorporated
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