Linearized digital phase and frequency detector

Details Linearized digital phase and frequency detector Linearized digital phase and frequency detector

1980-07-10

1983-03-29

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307526, 307514, 331 1A, 328133, H03K 526, H03D 1300

Patent

active

043785093

ABSTRACT:
A digital phase and frequency detector is capable of providing a linearized transfer function. The digital phase and frequency detector includes two latches each receiving an input and each providing an output. The output of the latches is combined by a logic gate to generate a reset signal. The linearization is a result of providing a delay to the reset signal. The reset signal is used to reset the two latches within the phase and frequency comparator. This improved phase and frequency comparator eliminates non-linearities which would otherwise be inherent in its transfer function and thereby degrade performance of phase-locked systems employing the comparator. The phase and frequency detector is easily manufactured as an integrated circuit and does not require any external signals in order to eliminate the non-linear region.

REFERENCES:
patent: 3710140 (1973-01-01), Volmerange
patent: 3714463 (1973-01-01), Laune
patent: 3750035 (1973-07-01), Crow
patent: 3792362 (1974-02-01), Grant
patent: 4027262 (1977-05-01), Sharpe
patent: 4297274 (1981-09-01), Suzuki et al.
patent: 4322643 (1982-03-01), Presler

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