Apparatus and method for controlling a delay chain

Details Apparatus and method for controlling a delay chain Apparatus and method for controlling a delay chain

2007-04-17

2007-04-17

Nguyen, Linh My (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S158000

Reexamination Certificate

active

11349516

ABSTRACT:
A method and apparatus for updating the control signal received by a delay chain in a DDR application. A register is used to regulate the control signal to the delay chain. The register only updates the signal at the delay chain when a signal is not passing through the delay chain. Additionally, the present invention is directed to a delay circuit that uses a plurality of PMOS and NMOS transistors connected in parallel to each other and to an inverter that provides the desired delay. The delay provided is achieved by sequentially turning off/on a series of the NMOS/PMOS transistor pairs.

REFERENCES:
patent: 6404258 (2002-06-01), Ooishi
patent: 6573777 (2003-06-01), Saint-Laurent et al.

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