Voltage level conversion circuit, method and method for providing initial voltage

Abstract

A voltage-electric level conversion circuit consists of an input buffer unit being connected between the first voltage source and a grounding voltage source and being used to receive input signal, an output buffer unit being connected between the second voltage source and a grounding voltage source and being used to output an output signal, a level processing unit being connected between input buffer unit and output buffer unit and being biased between the second voltage source and grounding voltage source for converting input signal to be output signal, a voltage drop unit connected to level processing unit and used to receive bias.

Description

technical field [0001] The present invention is a voltage level conversion circuit, especially a voltage level conversion circuit with automatic initialization function. Background technique [0002] A voltage level shifter is usually placed in the circuit system to shift the voltage level. [0003] Please refer to FIG. 1 , which is a schematic functional block diagram of a common voltage level conversion circuit 10 . The voltage level conversion circuit 10 includes: an input buffer unit 102 (input buffer) biased between a first voltage source VDD and a ground voltage source GND, the input buffer unit 102 is used to receive an input signal Vin, wherein the input signal The voltage level range of Vin is between VDD and GND; an output buffer unit (output buffer) 106 is biased between a second voltage source VPP and the ground voltage source GND, and the output buffer unit 106 is used to output an output signal Vout, wherein the voltage level range of the output signal Vout i...

AI Technical Summary

Problems solved by technology

[0005] In the above circuit system, since the first voltage source VDD and the second voltage source VPP are two independent voltage sources, it cannot be guaranteed that the first voltage source VDD and the second voltage source VPP can be turned on at the same time

When the second VPP is turned on but the first voltage source VDD is not turned on, the input buffer unit 102 that relies on the first voltage source VDD will not be able to operate normally, so the voltage at the output end of the input buffer unit 102 may be in an unknown state, with consequential effects The output voltage signal of the output terminal of the next-stage output buffer unit 106 (that is, the output terminal of the voltage level conversion circuit 10) is abnormal, which may cause the system to fail to operate normally.

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