Improved single-slope serial analog-digital converter

Abstract

The invention discloses an improved single-slope serial analog-digital converter, which comprises a ramp generator, a comparator, an adding counter and a system clock module; an output of the ramp generator is connected with an inverting input end of the comparator; an analog signal is connected with a non-inverting input end of the comparator; an output of the comparator is connected with an input end of the adding counter; and a control signal generated by the system clock module is respectively connected with the ramp generator and a clock control end of the adding counter. The phase and amplitude of a voltage ramp are adjusted by adopting a feedback mode, so that the influence of device parameter deviation on ramp voltage precision is reduced. The improved single-slope serial analog-digital converter overcomes the defect that the performance of the conventional single-slope serial analog-digital converter is influenced by an error of the ramp generator, and has conversion time thesame as that of the single-slope serial analog-digital converter. The improved single-slope serial analog-digital converter has a simple circuit structure; the whole system consists of elementary analog and digital modules; the design and analysis are quite simple; and the improved single-slope serial analog-digital converter is applicable to portable products in the pursuit of cost reduction andquick marketing.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to an improved single-slope serial analog-to-digital converter. Background technique [0002] Analog-to-digital converters play an important role in data acquisition systems. In the field of power management, because digital controllers have advantages such as good stability, programmable and low power consumption, more and more systems are controlled by digital circuits. In order to obtain the input of the digital circuit, an analog-to-digital converter is needed to convert analog signals such as voltage and temperature into digital signals that can be processed by the digital controller. With the continuous improvement of the integration level of integrated circuits, portable products have developed rapidly and maintained a strong growth momentum. Because digital power has the above-mentioned advantages, it is a trend to introduce digital power in portable products. ...

AI Technical Summary

Problems solved by technology

The disadvantage of the single-slope integrating ADC is that its performance is affected by circuit parameters such as the integrating capacitor; the dual-slope integrating ADC improves this shortcoming of the single-slope integrating ADC, but its conversion time is single slope integrating ADC with twice the

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