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Analog-to-digital conversion apparatus, analog-to-digital conversion method, and electronic device

一种模数转换、设备的技术，应用在模数转换器、模/数转换、代码转换等方向，能够解决消耗、电阻温度特性差、大电流等问题

Active Publication Date: 2012-02-01
TANITA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Zener diodes have the following problems: Zener diodes consume a large amount of current, their individual differences are large, and their temperature characteristics are worse than those of resistors
Therefore, it is difficult to perform sigma-delta type sampling at high frequency

Method used

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  • Analog-to-digital conversion apparatus, analog-to-digital conversion method, and electronic device
  • Analog-to-digital conversion apparatus, analog-to-digital conversion method, and electronic device
  • Analog-to-digital conversion apparatus, analog-to-digital conversion method, and electronic device

Examples

Experimental program
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no. 1 example

[0034] figure 1 It is a block diagram showing the AD conversion apparatus 1 according to the embodiment of the present invention. Provide analog input signal C to AD conversion device 1 in . AD conversion device 1 outputs digital output signal C out . The AD conversion device 1 includes an offset signal generation section 20 and an offset signal control section 10. The offset signal generating unit 20 generates n (n is a natural number greater than 1) offset signals δ k (k is an integer from 0 to n-1). The offset signal control section 10 controls the offset signal generation section 20 to switch n offset signals δ according to a predetermined rule k .

[0035] The AD conversion device 1 further includes an offset signal addition section 30, an AD conversion section 40, and a signal processing section 50. The offset signal adding section 30 adds n offset signals δ k Respectively with analog input signal C in Add them to generate n first signals S1. The AD conversion sectio...

no. 2 example

[0067] The second embodiment will be explained using the body measuring device 100 as an example of an electronic device including the AD conversion device 1 described above.

[0068] Composition of body measuring equipment

[0069] image 3 It is a block diagram showing the configuration of the body measuring device 100 according to the embodiment of the present invention. The body measurement device 100 measures the biological impedance and weight of the examinee, and calculates biological information such as body fat percentage by calculation based on these measurement results and personal information such as height, gender, and age input in advance.

[0070] The body measuring device 100 includes a weight scale 110, a first storage part 120, a second storage part 130, an input part 150, and a display 160. These components are connected to the microcontroller 140 via a bus (not shown). The microcontroller 140 serves as a control center for controlling the overall equipment. Th...

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PUM

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Abstract

The invention relates to an analog-to-digital conversion apparatus, an analog-to-digital conversion method, and an electronic device. The AD conversion apparatus includes a shift signal generating portion configured to generate n shift signals ( n is a natural number greater than one) of which amplitudes are different from each other; a shift signal controlling portion configured to control the shift signal generating portion; a compounding portion configured to compound input analog signal and the n shift signals sequentially into n first signals; an AD converting portion configured to execute AD conversion to convert the n first signals into n second signals; and a signal processing portion configured to calculate an average of the n second signals to generate output digital signal, wherein the shift signal generating portion is configured to generate the n shift signals so that each difference between adjacent shift signals differs from natural number multiples of a minimum resolution of the AD converting portion when the n shift signals are arranged according to the amplitudes.

Description

Technical field [0001] The present invention relates to analog-to-digital (AD) conversion equipment, AD conversion method and electronic device. Background technique [0002] The sampling method used by the AD converter is roughly divided into a type that performs sampling using a Nyquist frequency and an oversampling type that performs sampling using a frequency higher than the Nyquist frequency. The oversampling type aims to increase the resolution even when using a low-resolution AD converter. As one of the currently commonly used sampling methods, sigma-delta (sigma-delta) sampling is exemplified. [0003] The oversampling type AD converter obtains the intermediate value of the output code by averaging a plurality of AD conversion results obtained by sampling at a sampling rate higher than the Nyquist frequency. The intermediate value is obtained using various techniques. The original form used to obtain the intermediate value uses white noise as dithering noise. [0004] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/12
CPCH03M1/201H03M1/12
Inventor 中田雅人
Owner TANITA CORP