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Switched Capacitor Circuit and Pipelined Analog-to-Digital Converter

A digital converter and pipeline technology, applied in analog/digital conversion, code conversion, instruments, etc., can solve problems such as consumption, multi-power, and reducing the execution speed of the overall circuit

Active Publication Date: 2015-09-09
HIMAX TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because this technology must add an additional set of capacitors (and increase the circuit area), the two sets of capacitors in the input stage cause double loading, so more power will be consumed; and because three clock phases (clock phase ), thus slowing down the execution speed of the overall circuit

Method used

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  • Switched Capacitor Circuit and Pipelined Analog-to-Digital Converter
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  • Switched Capacitor Circuit and Pipelined Analog-to-Digital Converter

Examples

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Embodiment Construction

[0045] First, please refer to figure 2 , is a circuit diagram of a pipelined analog-to-digital converter (pipelined ADC) 2 according to an embodiment of the present invention. Such as figure 2 As shown, the pipelined analog-to-digital converter 2 includes a front-end sample-and-hold amplifier (SHA) 21, a multi-stage circuit 22, a delay element (delay element) 23 and a digital correction circuit twenty four. input signal V in Sampling is first performed by the front-end sample-and-hold circuit 21 to provide a stable hold signal to the rear-stage circuit 22 . The delay element 23 is connected between the output of the multistage circuit 22 and the digital correction circuit 24, and each stage circuit 22 analyzes part of the bit (B) respectively, and the analyzed part of the bit is synchronized through the delay element 23, and passed through the digital correction circuit 24 Correction and integration are performed to output a complete N-bit digital code (N is the resoluti...

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Abstract

Provided are a switched capacitor circuit and a pipelined analog-to-digital converter. The switched capacitor circuit comprises a first sampling capacitor, a second sampling capacitor, an operational amplifier (op-amp), a third capacitor and a fourth capacitor. The first sampling capacitor is used for taking the sample of an input signal at a sampling stage, and the second sampling capacitor is used for taking the sample of the input signal at the sampling stage. At a first amplifying stage, the third capacitor stores an offset voltage of the operational amplifier, and the fourth capacitor temporarily stores charges transferred by the first sampling capacitor and the second sampling capacitor. At a second amplifying stage, the fourth capacitor returns the stored charges to the first sampling capacitor and the second sampling capacitor.

Description

technical field [0001] The present invention relates to a switched-capacitor circuit, in particular to a switched-capacitor circuit used in a pipelined analog-to-digital converter (ADC). Background technique [0002] In recent years, the rapid growth of portable communication and audio-video electronic devices has made it an urgent need to extend the operating time of the devices. However, since the growth of battery life is slow, reducing power consumption has become an alternative feasible solution to meet this demand. [0003] In current video application specifications, a pipelined (also called pipeline) analog-to-digital converter (ADC) is more commonly used than other ADC architectures. figure 1 A traditional pipelined ADC architecture is shown1. input signal V in Sampling is first performed by a front-end sample-and-hold amplifier (SHA) 11 to provide a stable hold signal to a subsequent circuit 12 . As shown in the expanded block in the figure, each stage circuit ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/54
Inventor 林进富黄嘉玄
Owner HIMAX TECH LTD