modified 8 years ago

Cascode current source

00:43:21

The bottom transistor is the actual current source transistor, ordinarily the load ( here the 1K resistor ) is connected to the collector of this transistor. The top transistor is the cascode transistor and by holding the CCS transistor at a fixed voltage the CCS is much steadier with varying load or supply voltage. When I built this circuit the impedance was about 12Mohm at DC less at higher frequencies. 

Note I used a jfet and resistor for the 200uA CCS in the real circuit.

published 8 years ago

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