Application Note
Application And Design Of Gunn Oscillators
By HXI, LLC
Gunn diodes have been commercially successful as microwave oscillators since the late 1960's. They are employed wherever a stable low cost microwave source is needed. Gunn oscillators have found many slots throughout the industry including communications: as mixer local oscillators, pumps for parametric amplifiers, TX and RX oscillators for radio communications, radar sources - including police radar, commercial, and military, wireless LANs and also as detectors: commercial sensors for detecting: velocity, direction, proximity, or level sensing alarms. They have now found new markets in vehicular collision avoidance and intelligent cruise control.
"GUNN EFFECT" OPERATION
The "Gunn Effect" has been widely known since the discovery of microwave current instabilities in bulk N - type GaAs by J. Gunn in 1963. This transferred electron device or TED produces oscillations using the negative resistance property of bulk Ga As. This "negative resistance" phenomenon results when the electrons in N type Ga As traverse from a high mobility to a lower mobility valley thus producing a lower net electron velocity.
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