Digital-to-analog conversion control method and system

Abstract

The invention discloses a digital-to-analog conversion control method and system. A controller converts a received digital signal into a primary signal, an intermediate signal and an output signal; and the controller turns on the corresponding main switch group in the main voltage division group according to the value of the first-level signal, turns on the corresponding middle switch group in the middle voltage division group according to the value of the middle signal, and turns on the output switch of the corresponding analog signal in the output group according to the value of the output signal. The system comprises: a main voltage dividing group, which is used for dividing a reference voltage into a plurality of voltage segments; an auxiliary voltage division group which is used for dividing the voltage section of the main voltage division group into a plurality of auxiliary voltage sections in a switchable manner; and a controller which is used for switching a proper main voltage division group voltage section for the auxiliary voltage division group, and selecting the voltage output of the auxiliary voltage section as an analog signal according to the digital signal value. The invention provides the digital-to-analog conversion control method and system which can realize high-precision digital-to-analog signal conversion and occupy a small space.

Description

technical field [0001] The invention relates to the field of digital-to-analog conversion, in particular to a digital-to-analog conversion control method and system. Background technique [0002] At present, the voltage-type digital-to-analog conversion method usually uses a series of resistors to divide the reference voltage. One end of a control switch is connected between the two resistors, and the other ends of all control switches are connected in parallel to form an analog signal output end. The control switch is generally The mos tube controls the opening and closing of the switch through a certain frequency, and reads the potential value somewhere in the series resistance, and then the analog signal can be output at the analog signal output terminal. However, as the accuracy of the analog signal is getting higher and higher, When digital-to-analog signal conversion is realized by this method, more resistors need to be connected in series, which will occupy a larger v...

AI Technical Summary

Problems solved by technology

[0002] At present, the voltage-type digital-to-analog conversion method usually uses a series of resistors to divide the reference voltage. One end of a control switch is connected between the two resistors, and the other ends of all control switches are connected in parallel to form an analog signal output end. The control switch is generally The mos tube controls the opening and closing of the switch through a certain frequency, and reads the potential value somewhere in the series resistance, and then the analog signal can be output at the analog signal output terminal. However, as the accuracy of the analog signal is getting higher and higher, When digital-to-analog signal conversion is realized by this method, more resistors need to be connected in series, which will occupy a larger volume and increase the difficulty of manufacturing. Therefore, in order to deal with high-fidelity digital-to-analog signal conversion The demand for a new type of digital-to-analog conversion scheme is urgently needed

Images