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Airplanes and Rockets:
Diode detectors, discriminators, and limiters cover a very wide range of circuit configurations that perform functions like demodulating communications signal and signaling the presence of signals. Early detectors were implemented using vacuum tubes, but of course modern versions use silicon, germanium, GaAs, and other kinds of semiconductor compounds. Peak detectors, average detectors, video detectors, and others are built out of anything from standard PN junction silicon diodes to more elaborate constructions like Schottky, Gunn, and Esaki tunnel diodes.
Discriminators typically consist of a differentiator followed by an envelope detector, as with an FM radio. In general, it is a device that converts a property of an input signal, such as frequency or phase, into an amplitude variation, depending on how the signal differs from a standard or reference signal. Whereas a detector can be made of a single diode, resistor and capacitor, a discriminator is usually a more complex circuit.
Limiters are designed to prevent signals from exceeding a predetermined level, either to prevent damage to the following circuits, or to prevent signal degradation beyond a defined amount.
Advanced Control Components (now Aeroflex
Control Components - ACC)
Agile Microwave Technology | agilemwt.com
Cernex | cernex.com
Cougar Components (now Teledyne Cougar)
Herotek | herotek.com
Micronetics (now Mercury Systems)
Planar Monolithics | pmi-rf.com
Radar Technology, Inc | radartechinc.com
Radiall | radiall.com
Specialist Microwave Solutions Ltd |