Digital phase-locked loop circuit

Details Digital phase-locked loop circuit Digital phase-locked loop circuit

1981-03-10

1983-11-29

Heyman, John S.

Boots, shoes, and leggings

364715, 375120, 331 1A, 331 25, H03L 708

Patent

active

044183186

ABSTRACT:
A digital phase-locked loop consisting of a digital phase detector for detecting the phase differences between the output and the input frequency signals, a microprocessor programmed to perform both the functions of the loop filter and the phase shifter, and a binary rate multiplier to perform the function of voltage-to-frequency conversion is disclosed. A more precise frequency resolution is obtained by use of the binary rate multiplier and a further reduction in circuit complexity is achieved by removal of the phase shifter circuit in favor of the microprocessor programming.

REFERENCES:
patent: 3736590 (1973-05-01), Lipsey et al.
patent: 3913028 (1975-10-01), Bosselaers
patent: 4144489 (1979-03-01), Ward et al.
patent: 4229822 (1980-10-01), Bench
patent: 4231091 (1980-10-01), Motz
patent: 4276512 (1981-06-01), Wittke
patent: 4305045 (1981-12-01), Metz et al.
patent: 4307346 (1981-12-01), Kurosawa et al.

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