Driver circuits

摘要

A driver circuit has a number of transformers, the primary windings of which have a common terminal 38. A transistor arrangement 31 provides a low impedance output signal on the terminal 38 which is in antiphase to the clock signal applied to the terminal 45. Thus, one connection of the primary coil of each of pulse transformers 12 - 17 is always driven. The other connection of the primary coil of the pulse transformer is connected to the output of its respective tri-state gate 24 - 29 by way of its respective primary drive output terminal 39 - 44. The gates 24 - 29 are each operable to provide on their output terminal either a signal which follows the clock signal, in the case of a control signal applied to the respective control input terminal 32 - 37 being high, or a high impedance or "tri-state" output in the case of the control signal being low. <IMAGE>