The Farran Technology FDB-F4 Precision DC Bias Supply has been developed for use with high quality mixers and detectors. At mm and submm wavelengths these devices contain an ultra-low capacitance Schottky diode which must be biased in order to achieve maximum sensitivity. It is thus imperative that the bias supply be carefully designed if damage to, or failure of, the Schottky diode is to be avoided.

The FDB-F4 consists of a specially designed voltage regulated DC supply and includes two output current ranges, 1mA and 10mA, limited to full scale value. This protects the user from device burnout in case of udden self-bias or improper bias. The supply is battery operated from a built-in rechargeable battery and is designed for minimum standby power consumption. The supply can be removed from its enclosure and rack mounted. The FDB-F4 also has a fully buffered output connector on the rear panel, enabling remote / extenal precision monitoring of voltage and current bias simultaneously.