Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Phase shift by less than period of input
Patent
1995-09-18
1998-10-20
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Phase shift by less than period of input
327157, 327158, 327148, 327149, 327244, 331 1A, H03K 513, H03K 500
Patent
active
058252266
ABSTRACT:
A delay equalization circuit for minimizing the static phase error in a PLL is provided. The delay equalization circuit includes an external clock signal variable delay path, and an element for creating a pulse with a width proportional to the delay of the external clock signal variable delay path. The delay equalization circuit also includes a delay path in the feedback loop, and second element for creating a second pulse in proportion to the delay of the internal delay path. Finally, the circuit contains a comparison device. The comparison device compares the first and second pulses. The comparison device outputs a difference signal in proportion to the difference in the external and internal path delays. That difference signal is fed back and used to control the external path delay such that the external delay is driven to be substantially equal to the internal delay, minimizing the static phase error of the PLL device.
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Ferraiolo Frank D.
Gersbach John E.
Novof Ilya I.
Callahan Timothy P.
International Business Machines - Corporation
Le Dinh T.
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