IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
LETTER
Programmable pulsewidth control loop (PWCL) in dual-slope combination
H. S. MoB. K. MoonDaejeong Kim
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2010 Volume 7 Issue 9 Pages 615-620

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Abstract

A new technique to adjust the duty cycle of the output clock by adopting a pulsewidth control loop (PWCL) in dual-slope combination is presented. Correcting both rising and falling slopes simultaneously in their combination leads to a simple way for a wide correction range. Furthermore, the duty cycle can be easily adjusted to a desired value by setting up the programmable current sources in the charge pump. A generic circuit is suggested, and its validity is verified in a 0.13-µm CMOS technology under 1.2V supply. The simulated results with Spectre exhibit the integral nonlinearity (INL) of less than 2% for the output duty-cycle range from 6.25% to 93.75% with the consideration of process, voltage, and temperature (PVT) variation.

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© 2010 by The Institute of Electronics, Information and Communication Engineers
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