Abstract: A high speed voltage switching circuit comprises symmetrically arranged voltage relay transistor circuits coupled between voltage input terminals and a switched voltage output terminal. A first voltage relay transistor circuit relays a first voltage at the first input terminal to the output terminal in response to the controlled application of current directly to the output terminal from a first switched current source. A second voltage relay transistor circuit relays a second voltage at the second input terminal directly to the output terminal in response to the removal of current from the output terminal by way of a second switched current source. Each voltage relay transistor circuit preferably comprises pairs of bipolar transistors having their base-emitter junctions coupled in series between the first voltage input terminal and the output terminal.