Analog-to-digital (AD) conversion method based on cosine algorithm and Gray code

A technology of analog-to-digital conversion and gray coding, applied in the direction of analog-to-digital converters, etc., can solve problems such as increasing system errors, large noise, and affecting conversion accuracy

Inactive Publication Date: 2013-01-09
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
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Problems solved by technology

There is a sudden change in the output waveform of the circuit margin of each stage, and it is easy to introduce large noise, thereby affe

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  • Analog-to-digital (AD) conversion method based on cosine algorithm and Gray code
  • Analog-to-digital (AD) conversion method based on cosine algorithm and Gray code
  • Analog-to-digital (AD) conversion method based on cosine algorithm and Gray code

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Embodiment Construction

[0061] A preferred embodiment of the bidirectional communication isolation circuit according to the present invention will be specifically described below with reference to the accompanying drawings. Herein, like reference numerals denote like units or elements.

[0062] A / D conversion is to convert the analog voltage into the corresponding binary value output. Although the result of A / D conversion is an integer value, from the perspective of binary data bits, each bit value can also be regarded as a sequence of 0 and 1 that varies independently with the input voltage. Take 4-bit A / D conversion as an example, as figure 1 Process state diagram for natural binary code versus reference voltage shown.

[0063] Depend on figure 1 The conversion state of each conversion bit can be obtained,

[0064] D 0 = 1 ( U ...

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Abstract

The invention provides a binary analog-to-digital (AD) conversion method based on a cosine algorithm and a Gray code, which is characterized by comprising the following steps: sampling an analog input signal Ui; based on the cosine algorithm, calculating the n-bit data value Yn of the analog input signal Ui, wherein n is a natural number; comparing the data value Yn with zero to obtain an n-bit Gray code value Gn; and using the sequence of the Gray code Gn as an AD conversion output signal of the analog input signal. By using the Gray code mode, spike pulse possibly existing in the code can be eliminated; and due to the introduction of the cosine function algorithm, a full parallel coding method is realized. By using the concatenated pipeline type coding method based on the cosine algorithm, the jumping of the pipeline output of each stage can be effectively eliminated.

Description

technical field [0001] The present invention relates to a digital signal and analog signal conversion method, and more specifically, the present invention relates to an analog-to-digital conversion method based on cosine algorithm and gray coding. Background technique [0002] Analog-to-digital converter ADC is a bridge that converts analog signals into digital signals, and is the key and bottleneck of the development of electronic technology. At present, there are many types of ADCs in the world, such as parallel ADCs, successive approximation ADCs, integral ADCs, Σ-Δ ADCs, and pipeline ADCs. Various types of ADCs have their advantages and disadvantages and can meet specific application requirements. Parallel comparison ADC, also known as blinking ADC, is the fastest conversion speed among A / D converters, and it plays an irreplaceable role in video coding and other occasions that require high-speed digital-to-analog conversion. Since the resolution is limited by the die s...

Claims

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Application Information

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IPC IPC(8): H03M1/12
Inventor 吕锦柏王毅
Owner BEIJING JIAOTONG UNIV
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