Dual state phase detector having frequency steering capability

Details Dual state phase detector having frequency steering capability Dual state phase detector having frequency steering capability

1989-05-30

1990-09-25

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328104, 328137, 328155, 307514, 307262, H03K 906, H03D 1300

Patent

active

049596179

ABSTRACT:
A digital phase detector for providing an output characterized by the phase difference of a first input signals and a second input signal is provided. The phase detector comprises a first and a second dual state phase detector, each providing an output having a duty cycle corresponding to the phase difference of the input signals. The phase detectors operate linearly for a range of 360 degrees of phase difference, and provide a signal when the phase diference between the two input signals has exceeded the 360 degree range. The first phase detector provides the phase difference of the first and second input signals, while the second phase detector provides the phase difference between the second and the inverse of the first input signal. The output of the phase detector of the invention is provided by the phase detector having the phase difference within the 360 degree range.

REFERENCES:
patent: 4499425 (1985-02-01), Maas
patent: 4712060 (1987-12-01), Bailey et al.
patent: 4868513 (1989-09-01), Piercy et al.

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