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Multiplicative ADC and its pipeline ADC

An analog-to-digital converter technology, applied in the field of multiplying analog-to-digital converters, can solve the problems of high energy consumption, large circuit area, high power loss, and large circuit area

Inactive Publication Date: 2016-07-13
NOVATEK MICROELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, for existing pipeline analog-to-digital converters, it is necessary to use capacitors with higher capacitance and high-energy-consuming operational amplifiers in the front-stage sample-and-hold circuit. The converter faces the problems of high power consumption and large circuit area
Accordingly, how to propose a suitable circuit design scheme for the existing pipeline analog-to-digital converters, so as to improve the problems of high power consumption and large circuit area of ​​the existing pipeline analog-to-digital converters, is one of the directions that the industry is constantly working on.

Method used

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  • Multiplicative ADC and its pipeline ADC
  • Multiplicative ADC and its pipeline ADC
  • Multiplicative ADC and its pipeline ADC

Examples

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no. 1 example

[0041] Please refer to figure 2 , which shows a detailed block diagram of the multiplying ADC 100 according to the first embodiment. As an example of operation, the multiplying analog-to-digital converter 100 is a 1.5-bit analog-to-digital converter, which is used to convert the analog signal Vin to obtain a digital signal (the value of the digital signal is referred to as a digital value Dd0 hereinafter), It indicates, for example, the value of the first 1.5 bits in the digital data Dd.

[0042] In the example where the multiplying analog converter 100 is a 1.5-bit analog-to-digital multiplier, the value range of the digital value Dd0 is the values ​​0, 1 and 2; in other words, the minimum value Dd0_min and the maximum value Dd0_max of the digital value Dd0 are respectively equal to the digital value 0 and the numeric value 2. If it is represented by a thermometer code (ThermometerCode), the minimum value Dd0_min and the maximum value Dd0_max can respectively be the follow...

no. 2 example

[0052] Please refer to Figure 5 , which shows a block diagram of a multiplying ADC according to a second embodiment of the present invention. The multiplication analog-to-digital converter 100' of the present embodiment and figure 2 The difference between the multiplication analog-to-digital converter 100 of the first embodiment mainly lies in that the multiplication analog-to-digital converter 100' of this embodiment is except the sample-and-hold unit 310, the analog-to-digital conversion unit 320, the digital-to-analog conversion unit 330 and the arithmetic unit 40 In addition, a comparison unit 50 and a control unit 60 are provided to improve the multiplying ADC 100 to solve the problem that the digital value Dd0 generated by the multiplying ADC 100 may be wrong. The following is right Figure 5 Before the description of the multiplying analog-to-digital converter 100', we will use Figure 6 to Figure 8 The principle of the error in the digital value Dd0 in the multipl...

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Abstract

A multiplication analog-to-digital converter (Multiplying Analog-to-digital Converter) and its pipeline analog-to-digital converter, the multiplication analog-to-digital converter includes a sample and hold unit, which samples an analog signal to obtain a sampling level; analog-to-digital conversion The unit converts the analog signal to obtain a digital signal; the digital-to-analog conversion unit converts the digital signal to obtain a restored signal level; the arithmetic unit generates an output signal according to the difference between the sampling level and the restored signal level; the comparison unit compares the level of the output signal with the The upper threshold level is compared with the lower threshold level, and an indication signal is output. The upper threshold level and the lower threshold level define a predetermined level range; and the control unit, when the indication signal indicates that the level of the output signal falls outside the predetermined level range , shift the value of the digital signal and output the adjusted digital signal accordingly.

Description

technical field [0001] The present invention relates to a multiplying analog-to-digital converter (Multiplying Analog-to-digital Converter), and in particular to a multiplying analog-to-digital converter omitting a pre-sample and hold (Sample and Hold) circuit. Background technique [0002] In today's era of rapid technological development, pipeline (Pipeline) analog-to-digital converter (Analog-to-digital Converter) has been developed, and is widely used in such as wireless transmission circuits and consumer digital electronic products. Generally, a multi-bit pipeline ADC includes a sample and hold (Sample and Hold) circuit and at least one stage of multiplication ADC. The front-stage sample-and-hold circuit samples the input analog signal to obtain a sampled signal. The at least one-stage multiplication analog-to-digital converter converts the sampling signal to obtain a corresponding digital signal. [0003] However, for the existing pipeline analog-to-digital converter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/12
Inventor 苏东铭
Owner NOVATEK MICROELECTRONICS CORP