An Ultrafast Multibit/Stage Pipelined ADC Testing and Calibration Method
| Autor: | Tao Chen, Degang Chen, Chulhyun Park, Randall L. Geiger, Shravan K. Chaganti, Jose Silva-Martinez |
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| Rok vydání: | 2020 |
| Předmět: |
Spurious-free dynamic range
Dynamic range Computer science 020208 electrical & electronic engineering Linearity 02 engineering and technology Chip Effective number of bits Sine wave Least significant bit Sampling (signal processing) Integral nonlinearity 0202 electrical engineering electronic engineering information engineering Electronic engineering Electrical and Electronic Engineering Instrumentation Ultrashort pulse |
| Zdroj: | IEEE Transactions on Instrumentation and Measurement. 69:729-738 |
| ISSN: | 1557-9662 0018-9456 |
| DOI: | 10.1109/tim.2019.2907035 |
| Popis: | A novel ultrafast and low-cost pipelined analog-to-digital converter (ADC) testing and calibration method is proposed. The ADC nonlinearities are modeled as segmented parameters with interstage gain errors. During the test phase, a pure sine wave is sent as input and the model parameters are estimated from the output data with the system identification method. Significantly, fewer samples are required when compared to traditional histogram testing. The modeled errors are then removed from the digital output codes during the calibration phase. Extensive simulations have been run to verify the correctness and robustness of the proposed method. With just 4000 samples, a 12-bit ADC can be accurately tested and calibrated to achieve less than 1 least significant bit (LSB) integral nonlinearity (INL). Measurement results show that the ADC effective number of bits (ENOB) is improved from 9.7to 10.84 bits and the spurious-free dynamic range (SFDR) is improved by 20 dB after calibration. The chip is fabricated in 40-nm technology and consumes 10.71 mW at a sampling rate of 125 MS/s. |
| Databáze: | OpenAIRE |
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