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Detectors, Discriminators, & Limiters
Manufacturers & Services

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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)
advanced-control.com
732-460-0212 | Eatontown, NJ
Products include amplifiers, attenuators, detectors, frequency converters, custom integrated assemblies, limiters, phase shifters, switches, switch matrices, synthesizers. Services include hybrid micro-electronic assembly, wire bonding, PCB assembly, RF and microwave test to 40GHz, product design.

Agile Microwave Technology | agilemwt.com
516-931-1760 | Hicksville, NY
RF amplifiers, limiters, switches, and multipliers. Our goal is to cut product cost by more than 50% by keeping our overhead low, by staying small and focusing on innovative designs which are inspired by the commercial wireless market. Our goal is to provide same or better performance, size and quality at a much lower cost through better engineering and outsourcing to U.S. based contract manufacturers.

Cernex | cernex.com
408-541-9226 | Sunnyvale, CA
Amplifiers, antennas, couplers, isolators, circulators, filters, diplexers, oscillators, noise sources, switches, phase shifters, transition & adapters, mixers, waveguide products, attenuators, terminations, detectors, subsystems.

Cougar Components (now Teledyne Cougar) | cougarcorp.com
408-522-3838 | Sunnyvale, CA
RF and microwave cascadable amplifiers and subsystems in 100 kHz to 12 GHz range. Detectors, limiters, limiting amplifiers, attenuators, AGC amplifiers, oscillators w/MMIC amplifiers.

Herotek | herotek.com
408-941-8399 | San Jose, CA
GaAs FET amplifiers, low-noise, small signal & power 0.01 to 50 GHz, limiters, detectors, switches, harmonic generators.

Micronetics (now Mercury Systems)
micronetics.com
603-883-2900 | Hudson, NH
Test equipment, noise sources, voltage controlled oscillators, switches, limiters, phase shifters, attenuators.

Planar Monolithics | pmi-rf.com
301-662-5019 | Frederick, MD
Successive detection log video amplifiers, detectors, limiters, log amps, frequency discriminators, threshold detectors and receiver front-ends, phase shifters, digital control, fixed attenuators, power dividers.

Radar Technology, Inc | radartechinc.com
978-346-9775 | Merrimac, MA
Log, linear amplifiers, FM discriminators, IF limiters.

Radiall | radiall.com
203-380-9800 | Stratford, CT
Antennas, attenuators, couplers, DC blocks, detectors, fiber optic components, phase shifters, surge protectors, terminations, coaxial adapters, connectors, switches.

Specialist Microwave Solutions Ltd | smslimited.co.uk
01234 756034 | UK
Manufactures a wide range of custom control devices based on Silicon PIN diode and GaAs MMIC technology, develops custom circuitry to specifications repairs 3rd-party components, offers PIN and GaAs FET switches, attenuators, amplifiers, oscillators, limiters, phase shifters, switched filter banks, & multi function assemblies.

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