Abstract: A switch for selectively routing a signal to a receiving device for interrupting the transmission of said signal to said receiving device includes two latches, a differential delay circuit, and a buffer amplifier. State commands to individual switches in a routing system can be preset asynchronously by one latch and all of the switches in the system can be enabled to change states simultaneously by triggering a second latch. The switch is also of the make before break type, i.e., it turns on more rapidly than it turns off. The switch also includes programmable current sources in the buffer amplifier stage. These current sources are programmable to provide full power when the switch is conducting and to provide only standby power when the switch is nonconductive.

Abstract: A current mirror which is stable and accurate for a broad range of beta gain factors of the individual transistors thereof has two transistors of one type connected substantially as a Darlington pair. A multiplying, multi-collector transistor of the opposite type is connected serially between the collectors of the Darlington pair from base to emitter. One collector is diode connected to the base and the other is returned to a potential source. The collectors are of equal area.