Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Rectangular or pulse waveform width control
Reexamination Certificate
2007-02-28
2009-02-24
Donovan, Lincoln (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Rectangular or pulse waveform width control
C327S172000, C327S176000
Reexamination Certificate
active
07495491
ABSTRACT:
Apparatuses, circuits, and methods to reduce duty cycle errors are disclosed. Embodiments generally comprise buffer circuits coupled with error detection circuits and correction feedback circuits that sense duty cycles errors in output signals from the buffer circuits, generate error signals, and couple the error signals back to the inputs to correct or reduce the duty cycle errors. The error circuits may comprise active low pass filters in various embodiments, while amplifiers generally comprise inverter buffers or other simple buffers which alter or affect the input signals to the buffer circuits in order to reduce the duty cycle errors. In many system and apparatus embodiments, the error circuits comprise a resistor-capacitor circuit coupled with an inverter buffer. The error detection circuits generally function as active low pass filters and generate error signals for the feedback circuits.
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patent: 5572158 (1996-11-01), Lee et al.
patent: 6411145 (2002-06-01), Kueng et al.
patent: 6456133 (2002-09-01), Nair et al.
patent: 6833743 (2004-12-01), Gu et al.
patent: 6900681 (2005-05-01), Takano
patent: 6933759 (2005-08-01), Wu et al.
Charpiot Garland D.
Donovan Lincoln
Intel Corporation
O'Neill Patrick
Schubert Osterrieder & Nickelson PLLC
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