Level shift circuit

A technology of level shifting and circuit, which is applied in the direction of circuit, logic circuit connection/interface layout, electrical components, etc. It can solve the problems of slow action and deterioration of level shifting circuit action speed, and achieve the effect of suppressing hysteresis effect and action delay Discrete effect
CN1433076AInactive Publication Date: 2003-07-30SOCIONEXT INC
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
SOCIONEXT INC
Publication Date
2003-07-30
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

In a level shift circuit according to the invention, either an input signal IN or an inverted input signal XIN, which are input into the gate electrodes of n-type transistors 1, 2 for signal input, is also given to the substrate of that n-type transistor via p-type transistors 5, 6 for substrate bias. When the signal IN or XIN rises and changes, the threshold voltages of the n-type transistors 1, 2 for signal input is lowered due to the substrate bias effect. Consequently, even if the signal IN or XIN has a low voltage level, operation is carried out at high speeds. Also, when either an output signal OUT or an inverted output signal XOUT is changed to a high voltage level, the transistors 5, 6 for substrate bias become non-conducting, and thus the input signal IN or the inverted input signal XIN is not supplied to the substrate of the n-type transistors 1, 2 for signal input other than when the signal is changing. Consequently, a constant passing-through current does not flow to the substrate of these transistors.
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Description

technical field

[0001] The present invention relates to level shifting circuits for interfacing between circuits having different supply voltages. Background technique

[0002] With recent refinement of manufacturing, the power supply voltage of the internal circuits of semiconductor integrated circuits tends to be lowered due to the reliability of components. On the other hand, among the components used in systems such as electronic equipment, there are some components that continue to use the conventional power supply voltage. In order to achieve connection between these elements having different power supply voltages and the semiconductor integrated circuit, a level shift circuit is generally built in the semiconductor integrated circuit.

[0003] Recently, even in semiconductor integrated circuits, in order to reduce power consumption, measures have been taken to supply optimal power supply voltages to each circuit block, and in order to obtain the connection between th...

Claims

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