High speed phase/frequency detector

Details High speed phase/frequency detector High speed phase/frequency detector

1984-03-19

1986-07-01

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328133, H03K 906

Patent

active

045982171

ABSTRACT:
A phase/frequency detector to detect the phase/frequency difference between two signals comprises a first bistable circuit to produce a first output pulse in response to one of the two signals; a second bistable circuit to produce a second output pulse in response to the other of the two signals; a gate circuit coupled to the first and second bistable circuits responsive to the first and second output pulses to produce a reset pulse to reset the first and second bistable circuits after a predetermined time delay. A first circuit arrangement is coupled to the first bistable circuit and the gate circuit to reduce the width of the first output pulse and a second circuit arrangement is coupled to the second bistable circuit and the gate circuit to reduce the width of and invert the second output pulse. The second circuit arrangement includes a third circuit arrangement to equalize turn on and turn off times of the reduced width first output pulse and the reduced width second output pulse. A high speed switching arrangement is coupled to the first and the second circuit arrangements and a constant current arrangement for high speed switching of current into one of two electrical loads. An arrangement is provided, coupled to the constant current arrangement, to enable programming of the switched current. The detector further includes a level shifting arrangement to shift the reduced width first output pulse to a level of higher electrical potential to extend the voltage swing of the output voltage of the detector provided by the switching means.

REFERENCES:
patent: 4378509 (1983-03-01), Hatchett et al.

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