Title:
DUTY CYCLE CORRECTION CIRCUITRY
Document Type and Number:
WIPO Patent Application WO/2011/050216
Kind Code:
A3
Abstract:
Closed-loop techniques for adjusting the duty cycle of a cyclical signal, e.g., a clock signal, to approach a target value. In an exemplary embodiment, a charge pump is coupled to a charge and sample module, which drives a de-skew circuit in a negative feedback loop. The charge and sample module couples the charge pump to the integration capacitor during two of four successive phases, and also couples the integration capacitor to sampling capacitors during the other two of the four successive phases. The voltages across the sampling capacitors may be used to control the de-skew circuit, which adjusts the duty cycle of a cyclical signal to be adjusted.
Inventors:
WADHWA SAMEER (US)
PEDRALI-NOY MARZIO (US)
PEDRALI-NOY MARZIO (US)
Application Number:
PCT/US2010/053629
Publication Date:
September 22, 2011
Filing Date:
October 21, 2010
Export Citation:
Assignee:
QUALCOMM INC (US)
WADHWA SAMEER (US)
PEDRALI-NOY MARZIO (US)
WADHWA SAMEER (US)
PEDRALI-NOY MARZIO (US)
International Classes:
H03K5/156
Foreign References:
| US7432752B1 | 2008-10-07 | |||
| US20080164926A1 | 2008-07-10 |
Attorney, Agent or Firm:
XU, Jiayu (5775 Morehouse DriveSan Diego, Califonia, US)
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