Copy of Op-Amp - NPN-PNP BJT Feedback Pair Current Sink
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Op-Amp - Compound NPN-PNP BJT Pair Current Sink.
Rrefllim (reference high limit) forbids very low reference current.
Rrefhlim (reference low limit) prevents PNP's Vec from going lower than about 1.5 V.
Compared with just an NPN at the output, the advantage of using the compound pair is that the output current is much closer to the reference current. The drawback is the higher minimum voltage needed across the output transistor to maintain proper operation. This limits the range of operation of the circuit.
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BMCTrain01
1 Circuit
Date Created
2 years ago
Last Modified
2 years ago
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