Low-skew digital lever shifter for I/O

Details Low-skew digital lever shifter for I/O Low-skew digital lever shifter for I/O

2008-12-09

2010-02-23

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

C326S062000, C326S080000

Reexamination Certificate

active

07667522

ABSTRACT:
Circuits, methods, and apparatus for low-skew input/output level-shift circuits. One low-skew input/output circuit includes a single-ended-to-differential converter, a level-shift circuit, and a differential-to-single-ended converter. The circuit employs a low-skew single-ended-to-differential converter that provides an output to a level-shift circuit. To reduce skew, the single-ended-to-differential converter includes multiple paths from the input to its inverting and non-inverting outputs. The level-shift circuit translates signal levels between voltages used by the core and voltages used by the input and output circuits of the integrated circuit. An output from the level-shifter is received by the differential-to-single-ended converter. This converter also includes multiple signal paths coupling inverting and non-inverting signal paths. A threshold of an input inverter in the differential-to-single-ended converter is set by appropriately adjusting ratio of the size of its p-channel pull-up and n-channel pull-down transistors to match the rising and falling edges of the signals provided by the level-shift circuit.

REFERENCES:
patent: 5399915 (1995-03-01), Yahata
patent: 5872476 (1999-02-01), Mihara et al.
patent: 5909134 (1999-06-01), Sohn et al.
patent: 6683475 (2004-01-01), Baker
patent: 6774695 (2004-08-01), Hayashi et al.
patent: 6809554 (2004-10-01), Wada
patent: 6836163 (2004-12-01), Spehar
patent: 7034595 (2006-04-01), Lee

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