Method, system for adjusting digital potentiometers based on coherent signal and circuit

Abstract

The invention provides a method and system for adjusting digital potentiometers based on a coherent signal and a circuit. The method is applied to the circuit including a variable resistor unit composed of a plurality of digital potentiometers, firstly the expected total resistance value of the variable resistor unit is ensured by utilizing the expected value of the coherent signal of the circuit, and the order of each digital potentiometer is ensured based on the expected total resistance value; after the order of each digital potentiometer is set, whether a preset constraint condition is met or not is judged, and when the preset constraint condition is met, the order of each digital potentiometer is adjusted based on the difference of the actual total resistance value and the expected total resistance value of the variable resistor unit confirmed by the actual value of the coherent signal of the circuit; then, whether the order of each digital potentiometer needs to be adjusted again or not continues to be judged, the step is continuously repeated in the same way until the preset constraint condition is not met, and therefore the errors of the digital potentiometers can be effectively reduced.

Description

technical field [0001] The invention relates to the field of digital circuits, in particular to an adjustment method, system and DC power supply circuit for adjusting a digital potentiometer based on circuit related signals. Background technique [0002] The DC regulated power supply is generally implemented by a DC voltage conversion module (DC-DC) or a low-dropout linear regulator (LDO), and a feedback resistor network is used to adjust the output voltage. As long as the resistance value of the feedback resistor network is changed, the output voltage can be dynamically adjusted according to the load demand to achieve accurate and efficient power supply. [0003] With the development and maturity of digital potentiometer technology, in more and more applications, the mechanical variable resistors in the feedback resistor network are replaced by digital potentiometers, which not only improves product stability, digitalization and intelligence Level, can also reduce the volu...

AI Technical Summary

Problems solved by technology

Although the differential nonlinearity error is small after end-to-end resistance correction, but considering the wiper R W Error and temperature drift factors, in practice, the integral nonlinear error often exceeds 5LSB

[0006] Existing circuits using digital potentiometers often calculate the resistance value of the digital potentiometer according to the ideal formula, and then configure the corresponding order of the digital potentiometer. Since the error of the digital potentiometer itself (may reach hundreds of ohms) is not considered, it is determined by This will seriously affect the accuracy of the circuit output voltage

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