ECE3400 Lecture 26: BJT Current Mirrors (Analog Electronics, Georgia Tech course)

Reference: leachlegacy.ece.gatech.edu/ec...
Marshall Leach's BJT formula sheet: leachlegacy.ece.gatech.edu/ec...
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Torsten Abel's PPG Wave 2.3 demo: • PPG WAVE 2.3 Sounds
REwire's Buchla 259 Programmable Complex Waveform Generator demo: • Buchla 259 Vintage Mod...
ECE4450 Voltage Controlled Amplifiers: Operational Transconductance Amplifiers: • ECE4450 L4.1: Voltage ...
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0:00 -- Introduction
1:12 -- Basic current mirror
4:07 -- Output impedance of basic mirror
6:20 -- Base current compensation
8:29 -- Emitter resistors
9:18 -- Wilson current mirror
11:47 -- Output impedance of Wilson mirror
17:54 -- PNP mirrors
18:35 -- Current sinks vs current "sources"
19:13 -- Buchla 259 Waveform Generator
19:50 -- OTAs (Operational Transconductance Amplifiers)

[@DollysplitBand]

This came at a good time. Your explanation of pnp current mirrors with the added context of npn really made it sink in for me, thank you.

[@AnalogDude_]

There are at least 2 other methods or variations on this to create a current mirrors or like on top of the differential amps and does equal job.
Current mirrors on a chip die are differently executed, "hack a day" on hacking chips.
6:28 cool!
I see it as problem the traditional pnp current mirror on top of the differential amp, since the legs alternate but it only uses on leg to set the current and cutting of when the polarity of wave switches, why did they did do that?