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Pipeline architecture analog digital converter and offset voltage influence correction method thereof

An analog-to-digital, offset voltage technology, applied in the field of analog-to-digital conversion circuits, can solve problems such as error codes and errors, and achieve the effect of avoiding errors

Active Publication Date: 2014-01-29
HIMAX TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the offset of the comparator will be amplified by the subsequent circuit, this will lead to the generation of wrong code and other serious errors.

Method used

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  • Pipeline architecture analog digital converter and offset voltage influence correction method thereof
  • Pipeline architecture analog digital converter and offset voltage influence correction method thereof
  • Pipeline architecture analog digital converter and offset voltage influence correction method thereof

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Embodiment Construction

[0025] The offset voltage influence correction method and the pipeline structure analog-to-digital converter of the following embodiments can correct the error code and the out-of-range output voltage caused by the offset voltage of the comparator, so as to avoid errors in the operation of the whole circuit.

[0026] Please refer to Figure 5 , which is a block diagram of a pipeline architecture ADC according to an embodiment of the present invention. The pipeline architecture analog-to-digital converter 500 includes several stages of circuits, that is, a first stage circuit 503 , a second stage circuit 505 , a third stage circuit 507 , and up to an Nth stage circuit. The pipeline architecture ADC 500 further includes an acknowledgment code generator 511 , an offset voltage correction circuit 513 , and a code correction circuit 501 , wherein the code correction circuit 501 has a correction code generator 521 and a built-in decoding logic circuit 519 .

[0027] The first stage...

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Abstract

The invention provides a pipeline architecture analog digital converter and an offset voltage influence correction method thereof. The method includes: according to first input voltage, generating a first-level code and first output voltage; generating a second-level code according to the first output voltage; generating a confirmation code according to output voltage; determining a first correction code by reference to the first-level code and the confirmation code; when the first-level code is different from the first correction code, correcting the first-level code by the first correction code.

Description

technical field [0001] The invention relates to an analog-to-digital conversion circuit, and in particular to an analog-to-digital conversion circuit including multiple digital-to-analog converters. Background technique [0002] Analog digital converter (Analog digital converter; ADC), as the name suggests, converts analog data signals into digital codes, and the action of this conversion is to digitize and quantize analog signals. Analog-to-digital converters are an essential part of mixed-signal integrated circuits. Once the analog signal is converted to the digital domain, those complex signal processing processes can be implemented in a simpler way, and the immunity to noise will be improved. In some cases, implementing the ADC in a deep sub-micron process will reduce power consumption. [0003] Analog-to-digital converters use various functional architectures, such as integration, successive approximation, flash, and delta-sigma architectures. Recently, pipeline-base...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/10
Inventor 林进富
Owner HIMAX TECH LTD