Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Patent
1997-01-24
1999-05-04
Wambach, Margaret R.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
327111, 327153, 327270, 327333, H03L 700
Patent
active
059007524
ABSTRACT:
A circuit and method for deskewing signals by using cross power supply logic paths to compensate for delays created by power supplies operating at different voltages. A first replica circuit operating at a first supply voltage is placed in series with a first signal operating at a second supply voltage. A second replica circuit operating at the second supply voltage is placed in series with a second signal having a skew difference from the first signal and operating at the first supply voltage. The replica circuits generally have a scale factor which is generally a fraction of the equivalent driver circuits associated with the particular output signals. As a result, the present invention will deskew arbitrary power supply differences. By matching delays, the replica and true circuits provide the same delay. As a result, the sum of the delays for all the blocks in each path will be constant which maintains a desired skew difference between the output signals.
REFERENCES:
patent: 5521530 (1996-05-01), Yao et al.
patent: 5656961 (1997-08-01), Tran et al.
patent: 5712883 (1998-01-01), Miller et al.
patent: 5742183 (1998-04-01), Kuroda
Cypress Semiconductor Corp.
Maiorana Christopher P.
Wambach Margaret R.
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