| 摘要 |
<p>A push-pull driver circuit is disclosed comprising two stages. The first stage includes a current switch (T1,T2) producing a dual phase output. The second stage includes a first emitter follower (TH) for output pull-up and a second emitter follower (TH) and a current mirror (TM,TL) for output pull-down. The inputs of the first and second emitter followers are connected to respective output phases (4,3) of the first stage. The outputs (5,7) of the emitter followers (TH,T4) are connected to respective terminals of the current mirror (TM,TL) . The output of the second emitter follower (TH) also is connected to the output line being driven. A fixed biasing (Vcc,R4) source maintains the current mirror transistors (TL,TM) in conductive states at all times. Schottky diodes (S1,S2) are connected to the current mirror transistors (TL,TM) to prevent saturation. <IMAGE></p> |
