A high speed, highly linear CMOS fully differential track and hold circuit

  • Authors:

  • Shaahin Haddadi Nejad;Ziaaddin Daie Kouzekanani;Jafar Sobhi;Iman Salami Fard;Kuresh Ghanbari

  • Affiliations:

  • Faculty of Electrical and Computer Engineering, Tabriz University, Tabriz, Iran;Faculty of Electrical and Computer Engineering, Tabriz University, Tabriz, Iran;Faculty of Electrical and Computer Engineering, Tabriz University, Tabriz, Iran;Faculty of Electrical and Computer Engineering, Tabriz University, Tabriz, Iran;Faculty of Electrical and Computer Engineering, Tabriz University, Tabriz, Iran

  • Venue:
  • SBCCI '10 Proceedings of the 23rd symposium on Integrated circuits and system design
  • Year:
  • 2010

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Abstract

A fully differential high speed and highly linear CMOS Track-and-Hold amplifier (THA) that was used in front end of an Pipline ADC is described here. The architecture of Track-and-Hold based on an open-loop architecture with Miller hold capacitance. The Track-and-Hold circuit consists of an op-amp with low impedance nodes and properly voltage gain and bootstrapped switches. Designed circuit is simulated in a standard 0.35 um CMOS technology, the THA achieves -75.7 dB THD (Total Harmonic Distortion) for 1.6 Vp-p, 86 MHz input at 320 MHz sampling rate. The circuit design of major building blocks is described in details.