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Flash analog-to-digital converter

A digital converter, flash technology, applied in the direction of analog/digital conversion, code conversion, physical parameter compensation/prevention, etc., can solve problems such as reducing the accuracy of conversion operations

Inactive Publication Date: 2011-10-26
艾普契科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another problem is that fluctuations that are always present on the supply voltage will couple through these capacitors to the comparator inputs, where they degrade the accuracy of the switching operation

Method used

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  • Flash analog-to-digital converter

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0014] figure 1 The flash analog-to-digital converter is a circular resistor string RS including an even number of 2n equal-value resistors R. The connections between these resistors form 2n taps T 1 ...T 2n . Each of these taps is connected to a comparator C 1 ...C 2n the reference input. These comparators C 1 ...C 2n Each of them has to be connected to receive the analog input signal V i signal input terminal. The output of the comparator is connected to a clocked encoder E which converts the output signal of the comparator into a digital PCM code D.

[0015] 2n taps T of resistor string RS 1 ...T 2n connected to the same number of three-position switches S 1 ... S 2n . Each of these switches connects its respective tap at the first station to the reference voltage source V r The positive terminal of the second station is connected to the reference voltage source V r negative terminal and is not connected at the third station. The clocked controller CO contr...

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PUM

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Abstract

A flash analog-to-digital converter comprises a resistive string powered by a reference voltage source for providing a set of equidistant reference voltages and a set of comparators for comparing the analog input signal with the reference voltages. A set of switches are arranged and controlled to perform an algorithm for mitigating the influence of mismatches between the components. The switches are arranged between the reference voltage source and the resistive string so that switches in the reference inputs to the comparators are avoided. The resistive string is preferably circular. The converter can handle differential signals.

Description

technical field [0001] The present invention relates to a flash analog-to-digital converter for converting an analog input signal into a digital output code representative of the input signal, said analog-to-digital converter comprising Resistor string, comparator group, encoder and switching device, the reference voltage source is used to provide multiple equidistant reference voltages, the comparator group is used to compare the analog input signal with multiple reference voltages, the encoder receives the comparator As a result of the set, from which the digital output code is derived, the switching means are arranged and controlled to perform a mismatch reduction algorithm. Background technique [0002] Such a flash analog-to-digital converter is known eg from US patent 6281828 B1. In a flash ADC, the function of each comparator is to determine whether the analog input signal is above or below a reference voltage applied to the comparator. All comparators with a refere...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/06
CPCH03M1/0673H03M1/365
Inventor 马赛尔·佩尔格罗姆阿图尔·卡托奇马尔滕·韦尔特里格特
Owner 艾普契科技有限公司