A rapid power-switchable track-and-hold amplifier in 90-nm CMOS

  • Authors:

  • He-Gong Wei;U.-Fat Chio;Yan Zhu;Sai-Weng Sin;Seng-Pan U;R. P. Martins

  • Affiliations:

  • Analog and Mixed-Signal VLSI Laboratory, Faculty of Science and Technology, University of Macau, Macao, China;Analog and Mixed-Signal VLSI Laboratory, Faculty of Science and Technology, University of Macau, Macao, China;Analog and Mixed-Signal VLSI Laboratory, Faculty of Science and Technology, University of Macau, Macao, China;Analog and Mixed-Signal VLSI Laboratory, Faculty of Science and Technology, University of Macau, Macao, China;Analog and Mixed-Signal VLSI Laboratory, Faculty of Science and Technology, University of Macau, Macao, China;Analog and Mixed-Signal VLSI Laboratory, Faculty of Science and Technology, University of Macau, Macao, China and Instituto Superior Técnico, Technical University of Lisbon, Lisbon, Portugal

  • Venue:
  • IEEE Transactions on Circuits and Systems II: Express Briefs
  • Year:
  • 2010

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Abstract

This brief presents the design and implementation of a high-speed and high-accuracy power-switchable track-and-hold (T/H) in 90-nm CMOS that achieves a total harmonic distortion of -60 dB at 100 MS/s. With the proposed power-switching (P-S) technique, the T/H amplifier obtains not only further power optimization but also enhanced sampling speed and accuracy. The P-S technique requires no extra voltage headroom in the source-follower amplifier, thus allowing a relatively large input voltage swing of 0.8-Vpp in differential mode. A spurious-free dynamic range of 70 dB at 100 MS/s was measured with an input of 40.6 MHz and 0.8 Vpp. While driving a 2.5-pF capacitive load, the T/H consumes 2.97 mW from the 1.2-V supply.