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A 12-bit, 40-Ms/s pipelined ADC with an improved operational amplifier

Wang Yu, Yang Haigang, Yin Tao and Liu Fei

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Abstract: This paper proposes a 12-bit, 40-Ms/s pipelined analog-to-digital converter (ADC) with an improved high-gain and wide-bandwidth operational amplifier (opamp). Based on the architecture of the proposed ADC, the non-ideal factors of opamps are first analyzed, which have the significant impact on the ADC's resolution. Then, the compensation techniques of the ADC's opamp are presented to restrain the negative effect introduced by the gain-boosting technique and switched-capacitor common-mode-feedback structure. After analysis and optimization, the ADC implemented in a 0.35 μm standard CMOS process shows a maximum signal-to-noise distortion ratio of 60.5 dB and a spurious-free dynamic range of 74.5 dB, respectively, at a 40 MHz sample clock with over 2 Vpp input range.

Key words: pipelined ADC

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    Received: 20 August 2015 Revised: 09 December 2011 Online: Published: 01 May 2012

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      Wang Yu, Yang Haigang, Yin Tao, Liu Fei. A 12-bit, 40-Ms/s pipelined ADC with an improved operational amplifier[J]. Journal of Semiconductors, 2012, 33(5): 055004. doi: 10.1088/1674-4926/33/5/055004 Wang Y, Yang H G, Yin T, Liu F. A 12-bit, 40-Ms/s pipelined ADC with an improved operational amplifier[J]. J. Semicond., 2012, 33(5): 055004. doi: 10.1088/1674-4926/33/5/055004.Export: BibTex EndNote
      Citation:
      Wang Yu, Yang Haigang, Yin Tao, Liu Fei. A 12-bit, 40-Ms/s pipelined ADC with an improved operational amplifier[J]. Journal of Semiconductors, 2012, 33(5): 055004. doi: 10.1088/1674-4926/33/5/055004

      Wang Y, Yang H G, Yin T, Liu F. A 12-bit, 40-Ms/s pipelined ADC with an improved operational amplifier[J]. J. Semicond., 2012, 33(5): 055004. doi: 10.1088/1674-4926/33/5/055004.
      Export: BibTex EndNote

      A 12-bit, 40-Ms/s pipelined ADC with an improved operational amplifier

      doi: 10.1088/1674-4926/33/5/055004
      • Received Date: 2015-08-20
      • Accepted Date: 2011-11-22
      • Revised Date: 2011-12-09
      • Published Date: 2012-04-11

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