Level shift circuit

Details Level shift circuit Level shift circuit

2006-12-21

2008-11-11

Cho, James H (Department: 2819)

Electronic digital logic circuitry

Interface

Supply voltage level shifting

C326S068000

Reexamination Certificate

active

07449918

ABSTRACT:
To provide a single-ended-output-type level shift circuit capable of improving an increase in a delay time according to a voltage level shift operation at low voltage and suppressing an increase in an area occupied by the circuit, first and second inverters300and200of a CMOS type in which a gate of each MOS transistor is individually driven are provided and the first inverter300is used as a level converting unit. A voltage level of a first control signal CS1output from an output node no1of the first inverter300is forcibly dropped down by a voltage dropping circuit CONT1so as to accelerate the operation of the second inverter200. As a result, the inversion of the level of an output signal of the first inverter300is accelerated. Further, the balance between current capabilities of the individual transistors is optimized and, in particular, the sizes of the transistors constituting the second inverter200are reduced so as to suppress an increase in a circuit area.

REFERENCES:
patent: 6700429 (2004-03-01), Kanno et al.
patent: 6940332 (2005-09-01), Yamahira et al.
patent: 7085177 (2006-08-01), Savage
patent: 2004-153524 (2004-05-01), None

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