Double-sampling modulator applicable to incremental sigma delta ADC (analog to digital converter)

A double sampling and modulator technology, applied in the direction of analog-to-digital converters, etc., can solve problems such as power consumption, and achieve the effect of improving power consumption efficiency

Inactive Publication Date: 2012-09-26
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the sampling phase, the op amp is not doing its job, but is still consuming power

Method used

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  • Double-sampling modulator applicable to incremental sigma delta ADC (analog to digital converter)
  • Double-sampling modulator applicable to incremental sigma delta ADC (analog to digital converter)
  • Double-sampling modulator applicable to incremental sigma delta ADC (analog to digital converter)

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Embodiment Construction

[0023] The operation of the double-sampling modulator proposed by the present invention will be described in detail below with reference to the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0024] like figure 2 Shown is the basic circuit diagram of the fully-floating bilinear integrator used in the present invention, the positive-phase input voltage Vin+ is respectively connected to the seventeenth node A1 and the nineteenth node A3, and the inverting input voltage Vin- is respectively Connect the eighteenth node A2 and the twentieth node A4; the twenty-third switch S23, the seventh sampling capacitor Cs3 and the twenty-fifth switch S25 are sequentially connected in series, the twenty-fourth switch S24, the eighth sampling capacitor Cs3' and The twenty-sixth switch S26 is sequentially connected in series; the positive input terminal of the third opera...

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Abstract

The invention relates to a double-sampling modulator applicable to incremental sigma delta ADC (analog to digital converter) in the field of high precision analog to digital converters. A circuit structure of a complete floating double linear integrator is used, and two set of sampling capacitors and four reset switches are used. The double-sampling modulator has the advantages that power efficiency is enhanced, the problem of linearity deterioration caused by mismatch of the capacitors is solved, and chip area is not increased.

Description

technical field [0001] The invention belongs to the field of high-precision analog-to-digital converters, in particular to a double-sampling modulator suitable for incremental ΣΔADC. Background technique [0002] Incremental (incremental) ΣΔ ADC is a variant of traditional ΣΔ ADC, mainly used to realize high-precision analog-to-digital conversion of DC or low-speed signals, and its application fields are instruments, meters, sensor readout circuits, etc. Similar to traditional ΣΔ ADCs, incremental ΣΔ ADCs also include 1st-order, 2nd-order or high-order structures. In addition, incremental ΣΔ ADCs can also be combined with algorithmic (algorithm) ADCs to implement extended counting (Extended Counting) ADCs. In terms of circuit structure, the main difference between the modulator of the incremental ΣΔ ADC and the modulator of the traditional ΣΔ ADC is the reset operation, that is, the incremental ΣΔ ADC needs to reset and clear the modulator before converting each sampling poi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/12
Inventor 陈宏雷伍冬沈延钊许军
Owner TSINGHUA UNIV
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