| 摘要 |
An operational amplifier that may be fabricated on an integrated circuit is disclosed. Three precision emitter followers and four additional transistors comprise the major components of the op-amp. Two of the precision emitter followers are connected to the inverting and non-inverting inputs of the op-amp, respectively. The outputs of these two precision emitter followers are connected together to form a differential pair of precision emitter followers. Four additional transistors are used to convert the differential output of the precision emitter follower differential pair to a single-ended output and to provide gain. Two of the four additional transistors are used to mirror the currents in the drive transistors of the differential pair of precision emitter followers. These two mirrored currents are then fed to the drive and sense transistors of a current mirror respectively to convert the differential currents into a single-ended voltage. This single-ended output is coupled to the third precision emitter follower that is used as an output stage.
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