Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By phase
Patent
1995-05-25
1997-06-03
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By phase
327175, 327247, 327355, G01R 2504, H03K 522
Patent
active
056358636
ABSTRACT:
A programmable phase comparator comprises a switch circuit operable in response to first and second signals to provide an output signal representative of the phase relationship of the first and second signals. A reference signal is applied to the switch circuit to offset the output signal. A phase adjustment adjusts the phase relationship of the first and second signals so that the offset output signal is representative of a null condition. The switch circuit preferably is a Gilbert multiplier having a current source, an impedance means, and a transistor circuit connected between the current source and the impedance means. The transistor circuit has first and second inputs for receiving the first and second signals. The reference signal is input between the transistor circuit and the impedance means and is connected to an output. The output provides the output signal having a value based on the reference signal and the phase relationship of the first and second signals.
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Callahan Timothy P.
Englund Terry L.
VTC Inc.
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