Integrated, bistable flip=flop with differential amplifier - has current mirror in output branch of each amplifier switching transistor

摘要

The differential amplifier consist of two pnp transistors (T1,2) acting as switches, which are alternately made conductive by supplied current pulses. In the output branch of each switching transistor is fitted an active load of a current mirror (T3, 4) between collector and supply voltage (+V). The mirror two conductive transistors have their output current fed back to the switching transistor(s) input that it remains conductive. For the flip-flop switching, the base-emitter voltage of each non-conductive switching transistor is lifted for a short period such that the respective transistor becomes conductive. ADVANTAGE - No rapid switching and no substrate current injection.