Level shift circuit based on low voltage tube

Abstract

The invention provides a level shift circuit based on a low voltage tube. The circuit comprises an input stage circuit for receiving an inverted input signal, a load stage circuit with a positive feedback structure, and a clamp-level circuit consisting of a P tube voltage protection clamp circuit and an N tube voltage protection clamp circuit. The steady-state voltage of an input device and a drain terminal of a load device can be adjusted by adjusting a width and length ratio of a clamp device so as to control the voltage applied to the device to ensure that the voltage varies within an allowable range.

Description

technical field [0001] The invention relates to the field of integrated circuits, more specifically, it relates to a level shift circuit based on a low voltage tube. Background technique [0002] To realize the conversion of positive voltage logic (0V, 5V) to negative voltage logic (-5V, 0V), generally use such as figure 1 The circuit configuration shown. There is an inverter connected between the input port Vin1 and Vin2, so when Vin1 is low level (0V), Vin2 is high level (5V), and when Vin1 becomes high level (5V), Vin2 becomes Low level (0V). The gates of the transistors M5 and M6 are connected and grounded (0V), and they can clamp the upper limit of the output voltage to about 0V. M7 and M8 are a gate-drain cross-connected positive feedback structure, so that the two output terminals quickly reach high and low levels and reach a stable state. [0003] figure 1 The working state of the middle circuit is described as follows: When Vin1 changes from high level (5V) to ...

AI Technical Summary

Problems solved by technology

Compared with using low-pressure tubes, using high-pressure tubes has many disadvantages: such as large area, affecting response speed, requiring additional masks, increasing costs, etc.

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