In a differential amplifier, where matching is crucial, this inherent mismatch can cause significant performance degradation, such as increased input offset voltages. However, one drawback of the BJT current mirror is the inherent mismatch between the two collector currents due to their associated base currents. Since we need a differential amplifier with a single-ended output, we can use a current mirror load to efficiently convert the differential output current to a single-ended output voltage. The Single-Ended Output Differential Amplifier For a differential amplifier gain of around 40, we expect an input swing of about 750 A. To get an idea of the individual amplifier voltage swings, if we set the op-amp output swing of 3V, and a common-emitter amplifier with a gain of 100, the output swing of the differential amplifier will be around 30mV. Figure 1: A simple three-stage operational amplifier.
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