Electrical pulse counters – pulse dividers – or shift registers: c – Systems – Having phase shift
Patent
1986-10-09
1987-12-08
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Systems
Having phase shift
377 47, 328133, 331 1A, H04L 702, H03L 718
Patent
active
047122250
ABSTRACT:
Phase quantizer apparatus in an all digital phase locked loop to provide a two-part digital number representing the phase of the input signal (a noncontinuous pulse train) relative to the output signal of the all digital phase locked loop. The phase quantizer comprises a write counter (modulo m counter) and a phase counter (modulo n counter) which receive the noncontinuous pulse train as an input signal. The leading pulse edge in the noncontinuous pulse train increments the write counter and resets the phase counter. The write counter comprises a binary counter and a conversion circuit. The binary counter portion of the write counter was being used and is still being used in the digital communications system to provide address information to the elastic buffer to read data into predetermined storage locations in the elastic buffer. In addition, in the phase quantizer, the output of the binary counter is provided to the conversion circuit which converts the digital count to a two's complement code or notation which comprises the output signal. The phase counter comprises a counter and a divider circuit. The divider circuit receives an input signal from a high speed reference clock and divides the high speed reference clock signal to provide a clock signal to the counter of the correct frequency such that the counter will count a predetermined number of cycles between the receipt of consecutive pulses of the noncontinuous pulse train. The outputs of the write counter and the phase counter are combined to provide the two-part digital number representing the phase difference.
REFERENCES:
patent: 3688201 (1972-08-01), Pommerening
patent: 3753125 (1973-08-01), Ishikawa et al.
patent: 3758720 (1973-09-01), Dinn
patent: 3812433 (1974-05-01), Bradley
patent: 4449102 (1984-05-01), Frazer
Hammann H. Fredrick
Heyman John S.
Lutz Bruce C.
Rockwell International Corporation
Sewell V. L.
LandOfFree
Phase quantizer apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Phase quantizer apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phase quantizer apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-25290