Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By phase
Patent
1996-05-31
1998-04-07
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By phase
327 12, H03D 1300
Patent
active
057368724
ABSTRACT:
A circuit is described for detecting a difference in phase and frequency between two incoming signals. Digital output signals are produced whose widths vary according to a degree of phase lead or phase lag of one signal with respect to the other. First sub-circuits are connected, one to each of the input signals to produce an output pulse of short duration, compared with a period of the incoming signal, at rising transitions of the associated input signal. Two resettable pulse detection circuits each have an output set to a first stable state when an active signal is received on a reset input and which change to a second stable state when a short duration pulse is received from one of the subcircuits on a pulse input. Further circuitry is connected such that when both outputs of the resettable pulse detection circuits are in the second stable state, an active reset signal is supplied to both resettable pulse detection circuits, to return both of their outputs to the first stable state. The outputs of the resettable pulse detection circuits provide the outputs of the circuit.
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Samani Davoud
Sharma Vivek
Callahan Timothy P.
Morris James H.
Nu Ton My-Trang
SGS-Thomson Microelectronics S.A.
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