Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Patent
1997-06-30
1999-07-06
Cunningham, Terry D.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
327163, H03L 706
Patent
active
059202157
ABSTRACT:
In a charge pump the noise due to switching transients on the input pulse lines is kept to extremely low levels by translating input up/down pulses into small signal differential pulses which swing a differential pair of transistors by a small amount. This is done with level converters. The differential pair is kept in a saturation region, so that a large swing is not needed from the level converters and channel creation/destruction noise is avoided in addition to the noise reduction due to smaller swings. To avoid inherent offsets which might require a nonzero delta time width difference in the input pulses to produce a zero delta current, identical differential structures are used at the inputs for the two input pulse signals.
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Bosnyak Robert J.
Drost Robert J.
Albert Philip H.
Cunningham Terry D.
Kim Jung Ho
Sun Microsystems Inc.
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