Programmable level shifter

Details Programmable level shifter Programmable level shifter

2007-12-17

2009-10-20

Tan, Vibol (Department: 2819)

Electronic digital logic circuitry

Interface

Logic level shifting

C326S063000, C326S081000, C326S083000

Reexamination Certificate

active

07605609

ABSTRACT:
In one embodiment of the invention, a programmable level shifter can be selectively configured to operate in either a high-speed mode or a low-power mode. In both modes, the level shifter converts an input signal in one power supply domain into an output signal in another power supply domain. In the high-speed mode, p-type devices are configured as a current-mirror amplifier that provides the level shifter with relatively fast switching speed. In the low-power mode, the same p-type devices are configured as a cross-coupled latch that provides the level shifter with relatively low power consumption. Selectively enabled n-type devices provide the low-power mode with larger effective n-type devices to flip the cross-coupled latch formed by the p-type devices in the low-power mode.

REFERENCES:
patent: 5528172 (1996-06-01), Sundstrom
patent: 6025737 (2000-02-01), Patel et al.
patent: 6066977 (2000-05-01), Felton et al.
patent: 6249145 (2001-06-01), Tanaka et al.
patent: 6462602 (2002-10-01), Potter
patent: 6717451 (2004-04-01), Klein et al.
patent: 7019559 (2006-03-01), Kouzuma
patent: 7400168 (2008-07-01), Katou
patent: 7432740 (2008-10-01), Kanzaki

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