Digital phase aligner

Details Digital phase aligner Digital phase aligner

Filed on

1986-12-24

Date issued

1988-07-05

Examiner

Buczinski, Stephen C.

Patent Class

Pulse or digital communications

SubClass

Spread spectrum

SubSubClass

Direct sequence

Other Related Categories

375 86, 375 95, H04L 700

Type

Patent

Status

active

Patent number

047560118

Description

ABSTRACT:
This circuit phase aligns a phase-varying input data stream with a local clock. The incoming data stream is sampled at four quadrature points and these samples are applied to Ex-Or gates to yield four disagreement signals which indicates whether or not a transition from binary 0 to 1, or vise versa, has occurred between any pair of samples. The in-phase (0.degree.) and anti-phase (180.degree.) samples are serially loaded into different but similar shift registers, the taps of which provide the output with earlier or later versions of the input data stream at either 0.degree. or 180.degree.. A control circuit analyzes the disagreement signals and provides control signals which determine which of the shift register taps is connected to the aligner output. The circuit can correct for phase slippage between input data and local clock of up to plus or minus several time slots.

REFERENCES:
patent: 3404232 (1968-10-01), Burford
patent: 3851101 (1974-11-01), En et al.
patent: 3982184 (1976-09-01), Sanderson
patent: 4010323 (1977-03-01), Peck
patent: 4012598 (1977-03-01), Wiley
patent: 4128812 (1978-12-01), Pavlis
patent: 4191998 (1980-03-01), Carmody
patent: 4278898 (1981-07-01), Rhode
patent: 4376309 (1983-03-01), Fenderson et al.
patent: 4543531 (1985-09-01), Sugita et al.
patent: 4569065 (1986-02-01), Cukier
patent: 4604582 (1986-08-01), Strenkowski et al.
patent: 4611335 (1986-09-01), Arai et al.
patent: 4637037 (1987-01-01), Chao
patent: 4651108 (1987-03-01), Okita et al.
patent: 4672639 (1987-06-01), Tanabe et al.

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