Differential amplifier having balanced output

摘要

A classical differential amplifier provides outputs of unequal magnitude due to its emitter resistance being finite. In order to equalize its output, a voltage follower circuit is associated with each of the inputs of the differential amplifier. The output of each voltage follower circuit is converted to a current and subtracted from one of the outputs of the differential amplifier. Subtracting the outputs results in a differential amplifier with both outputs being substantially equal.