A voltage reference source circuit
A voltage reference source and circuit technology, applied in the direction of adjusting electrical variables, instruments, control/regulating systems, etc., can solve the problems of large circuit area and high circuit power consumption, and achieve low operating voltage and output voltage, low power consumption, The effect of low temperature coefficient
Active Publication Date: 2020-07-17
SYSU CMU SHUNDE INT JOINT RES INST +1
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Problems solved by technology
First of all, the output voltage of this circuit is about 1.2V, which is not suitable for low-voltage occasions. Secondly, this circuit uses transistors and resistors, and the area of the circuit is relatively large.
On the other hand, this kind of circuit requires a large static circuit, which leads to a large power consumption of the circuit, usually at the level of several hundred uW, which is a fatal weakness for applications with low operating voltage and low power consumption
Method used
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Embodiment 1
[0029] Such as figure 2 As shown, a voltage reference source circuit, a standard threshold CMOS tube working in the sub-threshold region and a high threshold CMOS tube are combined, and a reference source circuit that utilizes substrate bias technology and output negative feedback technology; The voltage reference source circuit has the characteristics of extremely low power consumption, low temperature coefficient, lower operating voltage and output voltage, better high-frequency PSRR and small area; the structure of the voltage reference source circuit includes: a start-up unit, a current generation unit and output feedback unit. The start-up circuit unit provides start-up voltage and current for subsequent circuits during the start-up phase of the circuit to prevent the circuit from operating in the zero-state region; the current generation circuit unit is composed of a standard threshold CMOS transistor and a high threshold CMOS transistor, and generates a bias for the ou...
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The invention provides a voltage reference source circuit. The circuit comprises a starting unit, a current generating unit and an output feedback unit; the starting circuit unit provides starting voltage and current for the current generating unit and the output feedback unit in a circuit starting stage; the current generating circuit unit is used for generating a bias current for the output feedback unit, enabling the generated current to be as low as possible to reduce the power consumption of the whole circuit, and enabling a current generating circuit to generate a current unrelated to apower voltage through the negative feedback effect of the output feedback unit; and the output feedback unit generates an output reference voltage and realizes an output zero temperature coefficient.The circuit is low in power consumption, low in temperature coefficient, relatively low in working voltage and output voltage, relatively high in high-frequency PSRR and small in area.
Description
technical field [0001] The present invention relates to the field of reference source circuits, in particular to a voltage reference source circuit. Background technique [0002] Reference source circuits are widely used in analog and mixed circuits, such as A / D, D / A converters, voltage tuners, voltmeters, test instruments for ammeters, and bias circuits. Its characteristic is that the output reference signal is stable and has nothing to do with changes in power supply voltage, temperature and process. In the SOC (system on chip) chip, the reference source circuit is an indispensable part, and its temperature stability and anti-interference performance affect the accuracy and performance of the entire circuit system. [0003] The following performance indicators are mainly considered in the design of the reference source circuit: power consumption, temperature coefficient, operating voltage range, and power supply rejection ratio. In order to meet the current requirements ...
Claims
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IPC IPC(8): G05F3/26
CPCG05F3/26
Inventor 谭洪舟张鑫曾衍瀚黄思帆陈翔张浩廖裕兴陈荣军
Owner SYSU CMU SHUNDE INT JOINT RES INST