a low - voltage , complementary symmetry amplifier arrangement is disclosed which functions effectively on supply voltages down to one volt dc . the amplifier is especially suited for audio processing applications in hand - held personal electronics apparatus , such as pocket radio receivers . the circuit configuration is easily implemented in integrated circuit form and operates efficiently on class b operation with its attendant advantages . the amplifier arrangement is characterized by the use of current sources in the collector and emitter circuits of a differential amplifier and thereby employs current ratios instead of the more conventional voltage levels to selectively control the conduction of associated output devices .