Patent · US Active

Duty cycle correction circuit and semiconductor integrated circuit apparatus including the same

US7863957B2 · kind B2 · utility

9Cited by
8References
25Claims
0Family size

Assignee

Inventors

Key dates

Filing dateDec 9, 2008
Grant dateJan 4, 2011
Priority date
Expiry dateFeb 18, 2029

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH03K2005/00058
  • WIPO fieldBasic communication processes
  • WIPO sectorElectrical engineering

Abstract

A duty cycle correction circuit includes a phase splitter configured to control a phase of a DLL clock signal to generate a rising clock signal and a falling clock signal, a clock delay unit configured to delay the rising clock signal and the falling clock signal in response to control signals to generate a delayed rising clock signal and a delayed falling clock signal, a duty ratio correction unit configured to generate a correction rising clock signal and a correction falling clock signal that toggle in response to an edge timing of the delayed rising clock signal and the delayed falling clock signal, and a delay control unit configured to detect duty cycles of the correction rising clock signal and the correction falling clock signal to generate the control signals.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.