Fast-response low-ripple envelope follower

  • Authors:

  • J. P. Alegre;S. Celma;J. M. García del Pozo;N. Medrano

  • Affiliations:

  • Group of Electronic Design (I3A), Department of Electronics and communications Engineering, Facultad de Ciencias, University of Zaragoza, Pedro Cerbuna 12, Area Electronica, 50009 Zaragoza, Spain;Group of Electronic Design (I3A), Department of Electronics and communications Engineering, Facultad de Ciencias, University of Zaragoza, Pedro Cerbuna 12, Area Electronica, 50009 Zaragoza, Spain;Group of Electronic Design (I3A), Department of Electronics and communications Engineering, Facultad de Ciencias, University of Zaragoza, Pedro Cerbuna 12, Area Electronica, 50009 Zaragoza, Spain;Group of Electronic Design (I3A), Department of Electronics and communications Engineering, Facultad de Ciencias, University of Zaragoza, Pedro Cerbuna 12, Area Electronica, 50009 Zaragoza, Spain

  • Venue:
  • Integration, the VLSI Journal
  • Year:
  • 2009

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Abstract

A novel envelope detector structure is proposed in this paper that overcomes the traditional trade-off required in these circuits. It improves both the tracking and keeping of the signal and thereby obtains great savings of capacitor area. At the same time, it cancels nonlinearities due to the use of switches when this technique is employed, such as nonlinearities caused by charge injection and, tenders high performance with small ripple (