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Definition of "PFD" |
Phase/frequency detector / Phase/frequency detector, Primary Flight Display(s) , personal flotation device / A phase frequency detector, in electronics is a device which compares the phase of two input signals. It has two inputs which correspond to two different input signals, usually one from a voltage-controlled oscillator (VCO) and another from some external source. It has two outputs which instruct subsequent circuitry on how to adjust to lock onto the phase. |
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