Reference voltage generating circuit

Abstract

Provided is a reference voltage generating circuit. The reference voltage generating circuit comprises a driving unit, a first switch device, a second switch device and a first compensating circuit, wherein the input end of the driving unit is connected with an external input signal and suitable for generating driving voltage according to the input signal and a feedback signal; the input end of the first switch device is coupled to a power source, and the output end of the first switch device outputs the feedback signal; the control end of the second switch device is coupled to the driving voltage, the input end of the second switch device is coupled with the output end of the first switch device, and the output end of the second switch device is connected with the ground through a first offset circuit; the input end of the first compensating circuit is coupled with the control end of the first switch device, the output end of the first compensating circuit is coupled with the output end of the second switch device, and the first compensating circuit is suitable for conducting voltage drop between the input end and output end of the first compensating circuit. According to the technical scheme, the application range of the reference voltage generating circuit is wider.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a reference voltage generating circuit. Background technique [0002] An analog-to-digital converter (ADC) is a type of device used to convert a continuous signal in analog form to a discrete signal in digital form. An analog-to-digital converter can provide the signal for measurement. High-precision ADCs have high requirements on the reference voltage. Usually, in order to reduce the design difficulty, the reference voltage is led off-chip and decoupled with a large capacitor. As the speed of the ADC becomes higher and higher, the inductance introduced by the chip package cannot be ignored more and more. Therefore, many high-speed and high-precision ADCs require that the reference voltage can be integrated on-chip. [0003] In prior art, please refer to figure 1 , figure 1 It is a structural schematic diagram of a reference voltage generation circuit in the prior art. Con...

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Problems solved by technology

[0004] However, the reference voltage generating circuit in the prior art can only generate a reference voltage slightly lower than the power supply voltage VDD, and the reference voltage value is limited within the range of several hundred millivolts; the value difference between the required reference voltage and VDD is large When , the reference voltage generation circuit in the prior art cannot play a role, which limits the application range of the reference voltage generation circuit

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