Circuit for coupling signals between circuit parts having separated power lines

摘要

A first circuit part (1) connects to a first supply line (3) with a first earthed voltage (GND1). Other circuit parts (2) connect to a supply line (4) different from the first supply line with an appropriate second earthed voltage (GND2). Signal paths (6-9) between the first and other circuit parts each have coupling capacitors (11-14) to transfer wanted signals (N1-N4) between the first and other circuit components. In each circuit part alongside the capacitors there are logical units (16-23) to transmit and receive wanted signals to be transferred along the signal paths. One of the circuit parts has a clock pulse generator (15) to send a clock pulse signal (TS) to the logical units where a wanted signal to be transferred is linked through an 'EXCLUSIVE OR' function to the clock pulse signal on both the transmission and receiving sides.