Abstract: An active regulator that reduces the noise occurring on an image intensif tube particularly suited for use in night vision system is disclosed. The active regulator reduces the noise thereof and increases the sensitivity of the night vision system.

Abstract: A cathode switch particularly suited for an image intensifier tube (IIT) is disclosed. The cathode switch provides cathode pulses to turn "on" and n "off" the IIT tube and does so with reduced power consumption and with reduced noise generated by associated high voltage switching.

Abstract: A resistance monitoring solid state circuit distinguishes between a minimum high resistance condition and a maximum low resistance condition by current mode switching of a pair of transistors the switching control voltages of which are established by bias resistor networks forming legs of a bridge, with the monitored resistance in one leg, the transistors switching current flow into one or the other of two logic signal generating paths that include opto-isolators for electrical isolation from utilization circuitry.

Abstract: A binary digital data link includes a differential transmitter, a shielded wire pair transmission line, and a receiver having electro-optic isolation utilizes input logic transistorized switching to control current flow direction in the wire pair, the receiver being responsive thereto to provide electrically isolated binary data output.

Abstract: A high speed fiber optic communication link having a differential transmir circuit for receiving digital data and providing a first output for transmitting a signal representing a logic "one" and a second output for transmitting a signal representing a logic "zero". First and second light emitting diodes are provided for converting the electrical signals into light signals. These light signals are transmitted by optical waveguides to first and second light detecting diodes which convert the light signals back into electrical signals. These converted electrical signals are then amplified by a differential receiver circuit.

Abstract: A receiver for use with a photodiode in an electro-optical transmission l. First and second amplifier circuit channels are connected to an output port of a photodiode. One channel is provided with a wide-bandwidth amplifier for amplifying the high frequency portion of a signal from said output signal port and a second channel is provided with a low frequency amplifier for amplifying direct current and the low frequency portions of the signal from said output signal port. The outputs of the wide-bandwidth amplifier and the low frequency amplifier are combined to provide a composite output signal which is an amplified replica of the output of said photodiode.

Abstract: An amplifier for use with a photodiode in an electro-optical transmission ne. A transimpedance amplifier is connected to an output port of a photodiode and a T-network feedback circuit is provided as a feedback element in order to provide a significant increase in the transimpedance gain-bandwidth product.