Succesive approximation type analogue-digital converting circuit

A successive approximation and capacitive technology, applied in analog-to-digital converters, analog-to-digital conversion, code conversion, etc., can solve the problems of voltage calibration sub-circuits without correction function, increased power consumption, complex circuits, etc., to achieve functional The effect of low power consumption, elimination of mismatch error, and compact structure

Active Publication Date: 2010-05-12
SANECHIPS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the circuit in the prior art is complex, and has no correction effect on the sub-circuit of voltage calibration, and a large number of digital circuits increase the power consumption correspondingly

Method used

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  • Succesive approximation type analogue-digital converting circuit
  • Succesive approximation type analogue-digital converting circuit
  • Succesive approximation type analogue-digital converting circuit

Examples

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Embodiment Construction

[0029] Below in conjunction with the accompanying drawings, the method of the present invention will be further described in detail.

[0030] The analog-to-digital conversion circuit of successive approximation of the present invention, as image 3 shown in the prior art figure 2 On the basis of the circuit, firstly, the module 202 is transformed into a window comparator 302. The window comparator includes a first comparator COMP1, a second comparator COMP2 and a pair of switches sp1 and sp2. The output signal and reference signal of the first comparator COMP1 are Vup compares once, the negative terminal of the first comparator COMP1 and the positive terminal of the second comparator COMP2 are connected to the switch signal Vsw signal of the 301 module (ie, the switch array 201 of the prior art), and the positive terminal of the first comparator COMP1 is connected to Vup signal, the negative terminal grounding signal of the second comparator COMP2, the second comparator COMP...

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Abstract

The comparator module is a window comparator (WC). WC includes a first comparator (FC), second comparator (SC) and a pair of switch. FC carries out comparison between the output signal and a referencesignal once. Negative end of FC and positive end of SC are connected to the switching signals of the capacitance and the switch array. Positive end of FC is connected to the reference signal, and thenegative end of SC is connected to ground signal. FC and SC carry out comparison between the output signal and ground signal once respectively. Result signal is obtained by AND operation for the twocompared results. The higher signal in result signals is the result caused by mismatched error (ME) of charge calibration. Feeding back ME to the correction resistance switches, the sequential approximation register, and the switch control logic module to correct the output of WC to zero. Eliminating ME, the invention possesses features of fine structure, and lower power consumption.

Description

technical field [0001] The present invention relates to a successive approximation (SAR) analog-to-digital conversion circuit (ADC), in particular to a charge-scaling and voltage-scaling successive approximation model with error correction Microelectronic circuit for digital conversion. Background technique [0002] The successive approximation A / D converter has become one of the most commonly used methods of A / D conversion due to its reasonably fast conversion time and moderate circuit complexity. [0003] The successive approximation A / D converter is divided into two main commonly used forms: voltage calibration first followed by charge calibration and charge calibration followed by voltage calibration. Here, voltage calibration is a module structured by the distribution of resistor switch strings. Charge calibration is a module with a switched capacitor array structure. The reason why a single resistive switch module or switched capacitor module is not used is to avoid a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/38H03M1/12
Inventor 易律凡
Owner SANECHIPS TECH CO LTD
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