Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Slope control of leading or trailing edge of rectangular or...
Reexamination Certificate
2008-04-16
2010-12-28
Donovan, Lincoln (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Slope control of leading or trailing edge of rectangular or...
C327S184000, C327S291000
Reexamination Certificate
active
07859317
ABSTRACT:
Clock generation circuitry is arranged in stages so as to convert a slow slew rate input signal into a high slew rate clock signal in a low power environment. Each stage includes a capacitor and an inverter, both fed by respective current mirrors. The capacitor is trickle-charged through its current mirror, and charge of the capacitor is dumped onto an output of the stage at a controlled timing. Two or more such stages may be provided, so as to improve the slew rate of both of the leading and trailing edges of the clock signal, and also so as to provide a convenient source of timing for dumping charge of each capacitor. Each stage might also include a diode switchably connected across the capacitor, so as to discharge the capacitor at appropriate timings, to reduce interference on succeeding stages that might otherwise be caused by residual charge on the capacitor.
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Enger Nathan
Stevenson Paul E.
Tourville Jon E.
Donovan Lincoln
Hernandez William
Marvell International Ltd.
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