GB1447573A - Circuit arrangement for providing unipolar output signals - Google Patents

Abstract

1447573 Transistor circuits KOMBINAT VEB FUNKWERK ERFURT 8 April 1974 15524/74 Heading H3T A circuit for converting bipolar input signals to unipolar output signals with simultaneous delivery of polarity information comprises: a delay network 3 and a trigger circuit 5 connected to input 1; an impedance converter 2 and a polarity inverter 4 connected to outputs from the delay network 3; gating circuits 6, 7 having their inputs connected to the outputs from the converter 2 and inverter 4 respectively and their output connected to a circuit output 9, the gates being controlled by respective control signal from the trigger circuit 5; and an output 10 for polarity information also connected to the trigger circuit 5. Input signals of one polarity set trigger circuit 5 to a first state in which gate 6 is open to pass the input at 1 to output 9 via impedance converter 2. Input signals of the other polarity cause trigger circuit 5 to open gate 8 to pass the input to the output via inverter 4. The outputs from the trigger circuit are fed to the gates via a control stage 7 (detailed in Fig. 2, not shown) which comprises two cascaded transistor stages in each control path (19, 21 or 20, 22) the output control signals being taken from the collectors of the second transistor of each pair and the emitters of these second transistors (21, 22) being coupled to a constant current source including a further transistor (23). The two gates comprise respective diode bridge circuits.