Digital signed phase-to-frequency converter for very high freque

Details Digital signed phase-to-frequency converter for very high freque Digital signed phase-to-frequency converter for very high freque

1991-04-05

1993-06-29

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

329307, 375119, H03D 318

Patent

active

052241254

ABSTRACT:
A signed phase-to-frequency (`P-to-F`) converter for use in a very high frequency Phase Locked Loop is disclosed. The P-to-F converter receives an input signal indicating plus/minus phase errors and an enable signal. The input signal is converted into a count by a counting circuit. An upper part of the count signal is used to generate a 3-phase sawtooth digital pattern. A lower part of the count is converted by a lower-bit pulse density modulation (`PDM`) circuit to generate a signal indicating the binary weight of the lower part of the count. The output of the lower-bit PDM circuit is applied, along with the 3-phase digital pattern, to three higher-bit PDM circuits. The carry output of the higher-bit PDM circuits is the digital output of the P-to-F converter and is converted from a digital to an analog signal by RC filters. The positive and negative phase error is indicated by the leading/lagging phase among the 3-phase output waveforms.

REFERENCES:
patent: 4019153 (1977-04-01), Cox, Jr. et al.
patent: 4295098 (1981-10-01), Crowley
patent: 4374438 (1983-02-01), Crowley
patent: 4682116 (1987-07-01), Wolaver et al.
patent: 4821293 (1989-04-01), Shimizume et al.
patent: 5056054 (1991-11-01), Wong et al.
AT&T Advance Data Sheet, "T7351 FDDI Physical Layer Device", Sep. 1990.

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