Inverter based duty cycle correction apparatuses and systems

Details Inverter based duty cycle correction apparatuses and systems Inverter based duty cycle correction apparatuses and systems

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.

REFERENCES:
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.

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