Digital phase detector

Details Digital phase detector Digital phase detector

1974-10-21

1976-05-11

Ruggiero, Joseph F.

Registers

Transfer mechanism

Traveling pawl

178 68, 328133, 235156, G06F 1534, H03B 304

Patent

active

039566234

ABSTRACT:
A digital phase detector which periodically detects the phase angle .theta..sub.k of a carrier signal in which data are encoded as discrete phase changes. A coherent or differential phase-modulated carrier signal is split into its in-phase and quadrature phase components R.sub.o Sin.theta.(t) and R.sub.o Cos.theta. (t). Each signal component is sampled at a predetermined modulation interval and converted into a digital word having the form R.sub.o Cos.theta..sub.k and R.sub.o Sin.theta..sub.k. In one configuration, the two signal components are applied to a digital divider network which forms the quotient .PSI. of the two digital words such that .vertline..PSI..vertline..ltoreq. 1. The quotient .PSI.is applied to a data look-up ROM, programmed for Tan.sup.-.sup.1 operation, which forms a digital reference phase angle .PHI.limited to an angle .ltoreq. 45.degree. is corrected by selection logic to form the desired phase angle .theta..sub.k. Once .theta..sub.k is known for each modulation interval, the encoded data may be readily extracted, since .theta..sub.k is proportional to the encoded data.

REFERENCES:
patent: 3551664 (1970-12-01), Mebus
patent: 3588710 (1971-06-01), Masters
patent: 3624520 (1971-11-01), Perkins, Jr. et al.
patent: 3746995 (1973-07-01), Schroeder et al.
patent: 3825737 (1974-07-01), Croisier

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