Increment type Sigma-Delta digital-to-analog converter

Abstract

The invention relates to an increment type Sigma-Delta digital-to-analog converter. The overall circuit is implemented by using a switched capacitor structure, the circuit uses the correlated double-sampling technique to reduce imbalance and errors, the increment type Sigma-Delta digital-to-analog converter is composed of two levels of integrators, and the first level integrator adopts a gain bootstrap operational amplifier. The increment type Sigma-Delta digital-to-analog converter provided by the invention has a clear and simple circuit structure, and has the advantages of high precision andlow power consumption.

Description

technical field [0001] The invention relates to an incremental Sigma-Delta digital-to-analog converter. Background technique [0002] With the advancement of digital signal processing technology, contemporary society has entered the digital age. Compared with analog signals, the calculation, storage and transmission process of digital signals can be realized more conveniently, so various digital devices continue to enrich people's lives. However, the signals that exist in nature are usually analog signals, such as light signals, sound signals, heat signals, and so on. Making full use of these analog signals to achieve an intelligent living environment is the direction of human continuous efforts, such as the invention of telephones and mobile phones to achieve long-distance communication; the development of light-controlled lighting systems can realize automatic lighting when night falls; Thermal Signal has designed temperature monitors, electronic thermometers and other p...

AI Technical Summary

Problems solved by technology

At this time, the offset voltage in the ADC, 1 / f The impact of non-ideal factors such as noise will be more prominent, which will greatly reduce the conversion accuracy of the ADC

Because the traditional Sigma-Delta ADC usually works under the condition of high-frequency input signal, its 1 / f The suppression effect of noise is not strong, and it cannot be applied to the field of temperature and humidity measurement. Therefore, the circuit design mainly considers reducing the influence of factors such as offset and thermal noise.

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