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Voltage reference generating circuit

A technology for generating circuits and voltage references, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve problems such as increasing system complexity, increasing layout area, and voltage reference circuits failing to meet user needs, achieving savings The effect of layout area and system complexity reduction

Active Publication Date: 2016-07-27
SHANGHAI BEILING
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AI Technical Summary

Problems solved by technology

[0003] Using the traditional voltage reference generating circuit in the high-voltage field not only needs to use high-voltage MOS transistors to isolate the input voltage, but also needs to add LDO and other circuits to generate the required output voltage, which increases the complexity of the system and increases the layout area.
[0004] Therefore, the existing voltage reference circuit can no longer meet the needs of users

Method used

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  • Voltage reference generating circuit

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Embodiment Construction

[0012] The voltage reference generating circuit of the present invention will be further described in detail below in conjunction with the drawings and specific implementation methods, but it is not intended to limit the present invention.

[0013] refer to figure 1 , the voltage reference generation circuit of the present invention includes a voltage divider circuit 100 and a reference voltage source circuit 200 . Wherein, the voltage divider circuit 100 includes the first, second, and third resistors R1, R2, and R3 sequentially connected in series between the input voltage VIN and the ground, and the first node formed between the first and second resistors R1, R2 A is the output terminal of the voltage reference generating circuit, and its output voltage is denoted as VOUT. The second node B formed between the second and third resistors R2 and R3 is connected to the output voltage Vg of the reference voltage source circuit 200 .

[0014] Specifically, the reference voltage ...

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Abstract

The invention relates to a voltage reference generating circuit which comprises a voltage division circuit and a reference voltage source circuit. The voltage division circuit comprises a first resistor, a second resistor and a third resistor which are sequentially connected between input voltage and the ground in series, a first node formed between the first resistor and the second resistor serves as the output end of the voltage reference generating circuit, and a second node formed between the second resistor and the third resistor is connected with output voltage of the reference voltage source circuit. According to the voltage reference generating circuit, reference voltage higher than a bandgap reference can be output, a low voltage resistance device can still be used under high input voltage, and therefore the systematic complexity is reduced, and the layout area is saved.

Description

technical field [0001] The invention relates to a voltage reference generating circuit. Background technique [0002] In a high-voltage circuit, the generation of a reference voltage higher than the bandgap reference (1.2V) generally uses a high-voltage device to generate a 1.2V bandgap reference, and then uses an operational amplifier, MOS tube, resistor, etc. Composing the LDO circuit is realized by setting the proportional relationship of different resistances. [0003] Using the traditional voltage reference generation circuit in the high-voltage field not only needs to use high-voltage MOS transistors to isolate the input voltage, but also needs to add LDO and other circuits to generate the required output voltage, which increases the complexity of the system and increases the layout area. [0004] Therefore, the existing voltage reference circuits are increasingly unable to meet the needs of users. Contents of the invention [0005] In order to overcome the deficie...

Claims

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Application Information

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IPC IPC(8): G05F1/56
Inventor 常祥岭孙彪
Owner SHANGHAI BEILING
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