Level shifter

A level shifter and positive power supply technology, which is applied in the direction of electrical components, electric pulse generation, logic circuit connection/interface layout, etc., can solve the problems that the level shifter cannot be used universally, and the switching noise current is large, so as to reduce the use area , Improve the switching speed and reduce the effect of switching noise

CN101908880AInactive Publication Date: 2010-12-08TAIWAN SEMICON MFG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2010-12-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

A level shifter includes a latch having a first output node and a second output node complementary to each other. A first pre-charge transistor has a source-drain path coupled between a positive power supply node and the first output node. A second pre-charge transistor has a source-drain path coupled between the positive power supply node and the second output node. The integrated circuit structure further includes a delay-inverter coupled between a signal input node and inputs of a first NMOS transistor and a second NMOS transistor in the latch. The delay-inverter is configured to allow one of the first pre-charge transistor and the second pre-charge transistor to pre-charge a respective one of the first output node and the second output node before an input signal at the signal input node arrives at a gate of a respective one of the first NMOS transistor and the second NMOS transistor. The invention has advantages of high shifting speed, low shifting noise and reduced chip applying area.
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Description

Technical field

[0001] The present invention mainly relates to an integrated circuit, and particularly relates to a level shifter. Background technique

[0002] The level shifter is a circuit for converting an input signal with a first voltage amplitude into an output signal with a second voltage amplitude, where the second voltage amplitude is different from the first voltage amplitude. Generally speaking, the amplitude conversion is to fix the low potential part and switch the high potential part. Level shifters are widely used in integrated circuits that integrate different types of circuits with different operating voltages.

[0003] The general application of the level shifter is to shift the voltage level of the signal transmitted between the I / O circuit and the core circuit of the integrated circuit device. Traditionally, the operating voltage of the I / O circuit is compatible with the operating voltage of the core circuit. However, with the shrinking of VLSI circuits, the...

Examples

Embodiment Construction

[0054] Hereinafter, embodiments of making and applying the present invention will be described in detail. However, it should be understood that the embodiments provide many applicable innovative concepts that can be implemented in a variety of specific situations. This embodiment only illustrates a specific way of making and applying the present invention, but it is not intended to limit the scope of the present invention.

[0055] According to an embodiment of the present invention, a level shifter is provided. Next, the changes and operations of the embodiment are discussed. In the description of various drawings and embodiments of the present invention, the same reference numerals represent the same elements. due to figure 2 with Figure 4 The level shifter shown is essentially symmetrical, so the discussion on one side of the level shifter can still be applied to the other side.

[0056] figure 2 A circuit diagram of a level shifter according to an embodiment of the inven...