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Adc calibration apparatus

A technology of calibration device and voltage correction, applied in the field of electronics, can solve problems such as inability to process at the same time, inability to effectively realize compensation, etc.

Active Publication Date: 2014-12-17
TAIWAN SEMICON MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the first type can only compensate for comparator offset, the second type can handle either offset or non-linearity but not both
Although the proposed third technique compensates for offset and nonlinearity, it is also not effective in compensating
Additionally, most techniques require additional calibration input

Method used

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Embodiment Construction

[0035] The making and using of the preferred embodiment are discussed in detail below. It should be appreciated that the present invention, while presenting many applicable concepts, can be implemented in a wide variety of specific contexts. The specific embodiments discussed are merely illustrative of specific ways to make and use the invention, and do not limit the scope of the invention.

[0036] The invention will be described below with respect to a preferred embodiment in a specific context, a blinking analog-to-digital converter (ADC). However, the present invention can also be applied to various ADC structures.

[0037] first reference figure 1 , showing a block diagram of a blinking ADC with ADC calibration setup. The blink ADC includes a track-and-hold (TH) amplifier 112 , a comparator array 114 , a reference generator 120 and an encoder 116 . In ADC processing, TH amplifier 112 receives an analog signal, and samples the analog signal at a certain voltage level, ...

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Abstract

An analog-to-digital (ADC) calibration apparatus comprises a calibration buffer, a comparator and a digital calibration block. Each reference voltage is sent to a track-and-hold amplifier as well as the calibration buffer. The comparator compares the output from the track-and-hold amplifier and the output from the calibration buffer and generates a binary number. Based upon a successive approximation method, the digital calibration block finds a correction voltage for ADC offset and nonlinearity compensation. By employing the ADC calibration apparatus, each reference voltage can be calibrated and the corresponding correction voltage can be used to modify the reference voltage during an ADC process.

Description

technical field [0001] The present invention relates to the field of electronics, and in particular to an ADC calibration device. Background technique [0002] Most signals received by electronic devices such as mobile phones are analog signals. An analog signal is a signal having an analog signal level with a continuous range of amplitudes. On the other hand, processors in electronic devices can only process digital data. Therefore, an intermediate device is required to convert the analog signal into a binary form of 1s and 0s for digital processing. This intermediate device is called an analog-to-digital converter (ADC). Various ADC structures exist, including pipeline type, flash type, Sigma-Delta (Sigma-Delta (Σ-Δ) type, successive approximation type, and the like. [0003] An n-bit blinking ADC includes five parts: a reference voltage generator, a track-and-hold (TH) amplifier; a comparator array, an array of latch devices, and an encoder. In this n-bit blinker ADC...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/10
CPCH03M1/1061H03M1/361
Inventor 赖逢时张秦豪曼诺吉·M·姆哈拉薛旭峰林永福翁正彦
Owner TAIWAN SEMICON MFG CO LTD