The fast time-interleaved ADC channel mismatch calibration method based on equivalent sampling and dynamic reference point

2019 ◽  
Author(s):  
Xiang Qian ◽  
Liu Hongqing ◽  
Wu Hengkui ◽  
Zhu Wenxing
Keyword(s):  
Reference Point ◽  
Calibration Method ◽  
Fast Time ◽  
Channel Mismatch ◽  
Interleaved Adc ◽  
Time Interleaved

scholarly journals A Statistic-Based Calibration Method for TIADC System

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Kuojun Yang ◽  
Shulin Tian ◽  
Peng Ye ◽  
Peng Zhang ◽  
Yuanjin Zheng
Keyword(s):  
Sampling Rate ◽  
Calibration Method ◽  
Wide Frequency Range ◽  
Accurate Estimation ◽  
Analog To Digital ◽  
Average Value ◽  
Gain Error ◽  
Sampling Points ◽  
Interleaved Adc ◽  
Time Interleaved

Time-interleaved technique is widely used to increase the sampling rate of analog-to-digital converter (ADC). However, the channel mismatches degrade the performance of time-interleaved ADC (TIADC). Therefore, a statistic-based calibration method for TIADC is proposed in this paper. The average value of sampling points is utilized to calculate offset error, and the summation of sampling points is used to calculate gain error. After offset and gain error are obtained, they are calibrated by offset and gain adjustment elements in ADC. Timing skew is calibrated by an iterative method. The product of sampling points of two adjacent subchannels is used as a metric for calibration. The proposed method is employed to calibrate mismatches in a four-channel 5 GS/s TIADC system. Simulation results show that the proposed method can estimate mismatches accurately in a wide frequency range. It is also proved that an accurate estimation can be obtained even if the signal noise ratio (SNR) of input signal is 20 dB. Furthermore, the results obtained from a real four-channel 5 GS/s TIADC system demonstrate the effectiveness of the proposed method. We can see that the spectra spurs due to mismatches have been effectively eliminated after calibration.

Researches on Channel Mismatch Effects in Time-Interleaved ADC System

2013 ◽  
Vol 655-657 ◽  
pp. 978-983
Author(s):  
Hui Yong Sun ◽  
Peng Cao
Keyword(s):  
High Speed ◽  
Dynamic Range ◽  
Signal To Noise Ratio ◽  
Mismatch Error ◽  
Signal To Noise ◽  
Gain Error ◽  
Channel Mismatch ◽  
High Speed Data Acquisition ◽  
Interleaved Adc ◽  
Time Interleaved

The Time-Interleaved ADC（TIADC) is an effective method for implement ultra high-speed data acquisition. However, the errors of channel mismatch are seriously degrade the signal-to-noise ratio of the system, such as Time-skew error, Gain error and Offset error. This paper have done some researches and analysis, and given the modeling of the three channels mismatch. What's more, it also given a detailed analysis of error and the method of measure it, derived the formula of signal to noise and distortion ratio(SINAD) and spurious free dynamic range(SFDR). All of them provide a reference for the tolerance range of TIADC channel mismatch error. Meanwhile, the result of this paper has provided a theoretical basis for eliminating TIADC channel mismatch error.

Research of Channel Dismatch Errors in Parallel AD Acquisition System Based on FPGA

2011 ◽  
Vol 201-203 ◽  
pp. 2126-2131
Author(s):  
Xing Ling Shao ◽  
Wei Yang ◽  
Zheng Yan Wang ◽  
Wen Dong Zhang
Keyword(s):  
Feature Extraction ◽  
Acquisition System ◽  
Echo Signal ◽  
Large Bandwidth ◽  
Channel Mismatch ◽  
Radar Echo ◽  
Explicit Analysis ◽  
Interleaved Adc ◽  
Time Interleaved

With the development of modem broadband radar, amount of reaserchers focus on broadband radar echo signal acquisitions and feature extraction of the target. Due to the large bandwidth as high as several MHz, the time interleaved ADC system is playing an important in radar echo systems, but this structure will bring in channel dismatch errors. The paper gave an explicit analysis of such three channel mismatch errors, and established the formulas of spectrum when all three mismatch errors exist together. Then presented the measure errors algorithm combined three errors according to the formulas of spectrum and the effective calibration algorithm．The algorithm was implemented in FPGA at last.

scholarly journals Explicit analysis of channel mismatch effects in time-interleaved ADC systems

2001 ◽  
Vol 48 (3) ◽  
pp. 261-271 ◽  
Author(s):  
N. Kurosawa ◽  
H. Kobayashi ◽  
K. Maruyama ◽  
H. Sugawara ◽  
K. Kobayashi
Keyword(s):  
Channel Mismatch ◽  
Explicit Analysis ◽  
Interleaved Adc ◽  
Time Interleaved
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