A high-precision reference voltage source resistant to production process deviation
A reference voltage source and reference voltage technology, applied in the direction of adjusting electrical variables, instruments, control/regulating systems, etc., can solve the problems of MOS tube threshold voltage difference, the influence of the output reference voltage cannot be completely eliminated, and the accuracy of the output reference voltage is affected.
Active Publication Date: 2021-06-22
HEFEI WISDOM DRAGON MACHINERY DESIGN CO LTD
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Problems solved by technology
However, in the production process of integrated circuits, due to the influence of production process deviations, the threshold voltages of completely identical MOS transistors in the two design drawings are different in actual circuits.
This difference directly affects the accuracy of the output reference voltage
Moreover, the carrier mobility of the MOS tube in the actual circuit has a nonlinear relationship with the temperature
This makes it impossible to completely eliminate the effect of temperature changes on the output reference voltage
Method used
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[0012]In order to facilitate the understanding of the present invention, the present invention will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are given in the description and drawings, but the present invention can be implemented in many different forms and is not limited to the embodiments described in the description. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.
[0013] It should be noted that when a certain element is fixed to another element, it includes directly fixing the element to the other element, or fixing the element to the other element through at least one other element in the middle. When an element is connected to another element, it includes directly connecting the element to the other element, or connecting the element to the other element throug...
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The invention provides a high-precision reference voltage source resistant to production process deviation, which includes two parts: a high-precision driving current generation circuit and a reference voltage generation circuit. The present invention adjusts the threshold voltage of the MOS transistor by setting the voltage from the grid to the substrate terminal of the MOS transistor to eliminate the influence of the production process deviation on the threshold voltage of the MOS transistor; the present invention eliminates the production process by adjusting the branch current The impact of process deviation on the gate-source voltage of the key MOS tube of the branch; the invention generates and outputs a high-precision and high-stability reference voltage that is not affected by temperature changes by setting a temperature compensation circuit structure that is not affected by the production process deviation.
Description
technical field [0001] The invention relates to the design of a reference voltage source circuit system, in particular to the design of a high-precision reference voltage source resistant to production process deviations. Background technique [0002] The reference voltage source is an important reference in the circuit, and its accuracy and stability are crucial. However, in the production process of integrated circuits, due to the influence of production process deviations, the threshold voltages of completely identical MOS transistors in the two design drawings are different in actual circuits. This difference directly affects the accuracy of the output reference voltage. Moreover, the carrier mobility of the MOS transistor in the actual circuit has a nonlinear relationship with the temperature. This makes it impossible to completely eliminate the influence of temperature changes on the output reference voltage. Aiming at the above problems, the present invention propo...
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IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 邵珠雷张翼张军利
Owner HEFEI WISDOM DRAGON MACHINERY DESIGN CO LTD