Duty cycle correction circuit whose operation is largely...

Details Duty cycle correction circuit whose operation is largely... Duty cycle correction circuit whose operation is largely...

Filed on

2006-07-14

Date issued

2008-08-26

Examiner

Cox, Cassandra (Department: 2816)

Patent Class

Miscellaneous active electrical nonlinear devices, circuits, and

SubClass

Signal converting, shaping, or generating

SubSubClass

Rectangular or pulse waveform width control

Other Related Categories

C327S172000

Type

Reexamination Certificate

Status

active

Patent number

07417480

Description

ABSTRACT:
A Duty Cycle Correction (DCC) circuit is provide in which pairs of field effect transistors (FETs) in known DCC circuit topologies are replaced with linear resistors coupled to switches of the DCC circuit such that when the switch is open, the input signal is routed through the linear resistors. The linear resistors are more tolerant of process, voltage and temperature (PVT) fluctuations than FETs and thus, the resulting DCC circuit provides a relatively smaller change in DCC correction range with PVT fluctuations than the known DCC circuit topology that employs FETs. The linear resistors may be provided in parallel with the switches and in series with a pair of FETs having relatively large resistance values. The linear resistors provide resistance that pulls-up or pulls-down the pulse width of the input signal so as to provide correction to the duty cycle of the input signal.

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