Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1989-07-24
1990-07-17
Callahan, Timothy P.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328133, 328140, 307511, 307526, 307527, H03L 700, H03K 906
Patent
active
049423657
ABSTRACT:
A circuit and method for detecting and determining the magnitude of either a synchronous frequency signal whose phase relationship to a reference signal is known or unknown or a non-synchronous signal near the reference frequency is based on using a pair of synchronous detectors one of which develops a COS Output and the other of which develops a SIN Output. The input sides of both synchronous detectors are connected to receive the signal being processed. The synchronous detector which develops the COS Output is connected to a first reference signal and the other synchronous detector input is connected to a second reference signal having a plus 90 degree phase relationship with the first reference signal. The COS Output and SIN Output are fed through a chopper analog switch controlled by a chop frequency and then to a RMS detector which develops the desired output.
REFERENCES:
patent: 4516042 (1985-05-01), Nakamura
patent: 4675613 (1987-06-01), Naegeli et al.
patent: 4675614 (1987-06-01), Gehrke
Callahan Timothy P.
Teltest Electronics Laboratories, Inc.
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