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In-plate digital self calibration capacitive successive approximation analog-to-digital converter and self calibration method thereof

An analog-to-digital converter and successive approximation technology, applied in analog/digital conversion, code conversion, instruments, etc., can solve the problems of increasing calibration unreliability, achieve the effect of reducing area overhead and increasing effective number of bits

Active Publication Date: 2017-12-05
北京大学(天津滨海)新一代信息技术研究院
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Problems solved by technology

Communication with the outside world increases calibration unreliability

Method used

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  • In-plate digital self calibration capacitive successive approximation analog-to-digital converter and self calibration method thereof
  • In-plate digital self calibration capacitive successive approximation analog-to-digital converter and self calibration method thereof

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Embodiment Construction

[0035] The present invention will be described in detail below through embodiments.

[0036] The SAR ADC in the present invention can work in two modes of calibration and non-calibration, can converge after a certain number of iterations on the weight of the SAR ADC, and can work for a certain period of time in the mode without calibration. In the application of the array-level SAR ADC, each SAR ADC can time-multiplex the calibration circuit.

[0037] In calibration mode, the sigma-delta ADC and SAR ADC simultaneously sample the same signal. After the SAR ADC conversion is completed, wait for the conversion result of the sigma-delta ADC, and finally the two ADCs get the digital output D 1 =11 ,D 12 ,...,D 1n > and D 2 =21 ,D 22 ,...,D 2n >. These two digital codes carry out the weight value of each bit of SAR ADC through the digital calibration circuit, such as the equation To update, the addition of each bit in this formula is not calculated in parallel. In the high-...

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Abstract

The invention discloses an in-plate digital self calibration capacitive successive approximation (SAR) analog-to-digital converter and a self calibration method thereof. The analog-to-digital converter comprises a weight register, a capacitive SAR ADC and a calibration unit, wherein the calibration unit comprises a sigma-delta ADC, a sample hold circuit and a digital calibration circuit, an input end of the sample hold circuit is connected with a signal input end, an output end of the sample hold circuit is connected with the digital calibration circuit through the sigma-delta ADC, a comparator output end of the capacitive SAR ADC is connected with the digital calibration circuit, the digital calibration circuit is connected with the weight register and is used for carrying out update weight values of the weight register according to D1 and D2, and the weight register is connected with the comparator output end of the capacitive SAR ADC. The analog-to-digital converter is advantaged in that the valid bit number of an analog to digital conversion circuit is improved, and area cost of a calibration circuit is reduced.

Description

technical field [0001] The invention belongs to the technical field of microelectronics and solid electronics. In order to improve the effective precision of a successive approximation SAR (Successive Approximation) analog-to-digital converter (ADC), a capacitance array self-calibration technology based on an integrated digital domain algorithm in a chip is proposed. Background technique [0002] With the development of information technology, many IoT, wearable electronic device applications require high sampling rate, high precision, low power consumption and small size analog-to-digital converters. As the interface between the real analog signal world and the computer system digital signal world, ADC plays a key role in military, communication, imaging, audio, medical and other fields. It converts the analog signal in the real world into the corresponding binary code through sampling and quantization, which is convenient for the computer system to further process the info...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/40
CPCH03M1/403
Inventor 吕彬彬鲁文高陈中建张雅聪
Owner 北京大学(天津滨海)新一代信息技术研究院
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