Sigma-Delta analog-to-digital converter

An analog-to-digital converter and operational amplifier technology, applied in the direction of analog-to-digital converters, etc., can solve the problems of temperature drift and low-frequency noise offset of Sigma-Delta analog-to-digital converters, and achieve the effect of eliminating offset and ensuring conversion accuracy.

Active Publication Date: 2015-06-03
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0015] The present invention solves the problem of the misadjustment of the Sigma-D

Method used

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Examples

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Embodiment Construction

[0044] As described in the Background Art, for figure 1 The Sigma-Delta analog-to-digital converter shown can eliminate the offset caused by its internal impedance mismatch by using off-chip calibration, but it cannot eliminate the offset caused by temperature drift and low-frequency noise (mainly 1 / f noise, that is, flicker noise ) caused by imbalance.

[0045] In order to eliminate the offset caused by temperature drift and low-frequency noise, the technical solution of the present invention provides a Sigma-Delta analog-to-digital converter with chopper technology. The chopping technique is to eliminate the offset voltage by modulating the offset voltage to a high frequency and then processing it through low-pass filtering. Specifically, a square wave signal is used to modulate the input signal to a high frequency, then the modulated input signal and the offset voltage are amplified together as the input signal of the amplifier, and finally the output signal of the amplifi...

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Abstract

The invention provides a Sigma-Delta analog-to-digital converter, which comprises a sampling maintaining unit, an amplification unit, a voltage comparison unit, an input chopped wave unit and an output chopped wave unit, wherein the input chopped wave unit is suitable for being used for carrying out chopped wave processing on a first input signal and a second input signal to obtain a first processing signal and a second processing signal and to send the first processing signal and the second processing signal to the sampling maintaining unit, the first input signal and the second input signal are differential signals, and the output chopped wave unit is applicable to the chopped wave processing on a first comparison signal and a second comparison signal which are output by the voltage comparison unit for obtaining an output signal of the Sigma-Delta analog-to-digital converter. The Sigma-Delta analog-to-digital converter provided by the invention has the advantage that the detuning due to temperature drift and low-frequency noise is eliminated by using a chopped wave technology.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a Sigma-Delta analog-to-digital converter. Background technique [0002] With the rapid development of digital electronic technology, various digital devices, especially digital electronic computers, are widely used and penetrate into almost all fields of the national economy. Digital computers can only process digital signals, and the processed results are still digital quantities. When it is used for automatic control of analog-to-digital converters in the production process, the variables to be processed are often continuously changing physical quantities, such as temperature, pressure, and speed. These are all analog quantities. The analog quantities of these non-electronic signals must first be converted into voltage or current signals through sensors, and then converted into digital quantities through an analog-to-digital converter before they can be sent to the...

Claims

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Application Information

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IPC IPC(8): H03M1/12
Inventor 沈海峰吴建刚张富强李力游
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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