Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Phase shift by less than period of input
Patent
1997-10-24
2000-04-18
Ton, My-Trang Nu
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Phase shift by less than period of input
327243, H03H 1116
Patent
active
060520108
ABSTRACT:
An improved clock generation circuit is provided for changing the phase of one signal relative to the phase of another signal. Both signals presented to the clock generation circuit transition at the same frequency. One or both of those signals are delayed by dissimilar amounts to skew the phase difference between the signal pairs and 90.degree.. A phase detector, or logic gate, determines a phase differential between the incoming signals. A charge pump and storage device maintain a voltage level commensurate with that difference. The stored voltage is then used to control a feedback loop coupled from the output of the detector to a current path which traverses a buffer coupled between an input signal and a phase compensated output signal. The current path receives current necessary to change both the rise and fall rates produced by the buffer. According to another embodiment, two feedback loops may be used for a corresponding pair of buffers. A pair of buffers allows phase modification of both incoming signals to corresponding output signals in a more efficient and timely manner.
REFERENCES:
patent: 5566204 (1996-10-01), Kardontchik et al.
patent: 5610954 (1997-03-01), Miyashita et al.
patent: 5844950 (1998-12-01), Aono et al.
patent: 5894496 (1999-04-01), Jones
patent: 5896053 (1999-04-01), Prentice
Cypress Semiconductor Corp.
Daffer Kevin L.
Nu Ton My-Trang
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