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Interface circuit for high-low level conversion

An interface circuit, high and low level technology, applied in the field of interface circuits with high and low level conversion, can solve the problems affecting the reliability of the interface circuit and cannot be adjusted, and achieve the effect of improving reliability and simple circuit structure

Pending Publication Date: 2020-04-17
3PEAK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The prior art first threshold voltage V IH and the second threshold voltage V IL It will change with different processes and cannot be adjusted, which greatly affects the reliability of the interface circuit

Method used

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  • Interface circuit for high-low level conversion
  • Interface circuit for high-low level conversion
  • Interface circuit for high-low level conversion

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with various embodiments shown in the drawings. However, these embodiments do not limit the present invention, and structural, method, or functional changes made by those skilled in the art according to these embodiments are included in the protection scope of the present invention.

[0029] The invention discloses an interface circuit for high-low level conversion. The interface circuit includes:

[0030] A level conversion unit, including a plurality of cascaded first inverters, the level conversion unit is used to achieve high and low level conversion according to the threshold voltage;

[0031] The feedback unit includes a second inverter and an impedance adjustment unit, and the feedback unit is used to adjust the threshold voltage.

[0032] The present invention will be further described below in conjunction with specific examples.

[0033] ginseng figure 2 Shown is a schematic circuit diag...

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Abstract

The invention discloses an interface circuit for high-low level conversion. The interface circuit comprises a level conversion unit which comprises a plurality of cascaded first inverters and is usedfor achieving conversion of high and low levels according to a threshold voltage, and a feedback unit which comprises a second phase inverter and an impedance adjusting unit and is used for adjustingthe threshold voltage. The circuit is simple in structure, the feedback unit adjusts the threshold voltage in the interface circuit by adjusting the resistance value of the impedance adjusting unit, and the reliability of the interface circuit is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of chip interface, and in particular relates to an interface circuit for high-low level conversion. Background technique [0002] In chip input interface circuits, such as synchronous parallel interface (SPI) input serial digital interface (SDI), it is usually necessary to realize low level to high level and high level to low level. [0003] ginseng figure 1 Shown is an interface circuit with a feedback function in the prior art, which includes two cascaded first-stage CMOS inverters 11' and second-stage CMOS inverters 12'. When the input IN signal gradually rises from low level to exceed the first threshold voltage V IH Afterwards, the output OUT signal is reversed to a high level; on the contrary, when the input IN signal gradually decreases from a high level to be lower than the second threshold voltage V IL After that, the output OUT signal is reversed to a low level. [0004] In addition, in the pri...

Claims

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Application Information

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IPC IPC(8): H03K17/687
CPCH03K17/687
Inventor 程龙
Owner 3PEAK INC