A Virtual-ADC Digital Background Calibration Technique for Multistage A/D Conversion

作者：Peng Bei^*; Li Hao; Lee Seung Chul; Lin Pingfen; Chiu Yun

来源：IEEE Transactions on Circuits and Systems II-Express Briefs, 2010, 57(11): 853-857.

DOI：10.1109/TCSII.2010.2082850

• Adaptive digital calibration
• analog-to-digital converter (ADC)
• equalization
• interpolation
• nonlinear distortion
• parallel-ADC equalization
• virtual-ADC equalization

A nonlinear adaptive digital calibration technique for multistage analog-to-digital converters (ADCs) is presented. The approach is derived from a replica-path scaling principle inspired by the parallel-ADC equalization architecture. The treatment of residue gain nonlinearities leads to potentially significant power savings for a simple modification of the first ADC stage. The design tradeoffs involved in this technique, particularly a band-limited interpolator employed, are discussed in detail. Computer simulations demonstrate signal-to-noise-plus-distortion-ratio and spurious-free-dynamic-range improvements from 40 to 90 dB and 45 to more than 100 dB, respectively, for a 15-bit pipelined ADC.

• 出版日期2010-11
• 单位北京工业大学