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Weak Inversion MOS Varactors for Tunable Integrators

  • Shouri Chatterjee
  • Kong Pang Pun
  • Nebojša Stanić
  • Yannis Tsividis
  • Peter Kinget
Part of the Analog Circuits and Signal Processing Series book series (ACSP)

Abstract

A tunable integrator is the basic building block of a tunable filter. Traditionally, tunability can be accomplished using a MOSFET-C structure with MOS devices replacing resistors; or, using switches and banks of resistors and capacitors for discrete tuning; or, using transconductance-C techniques; or, using a varactor-R structure with varactors replacing capacitors. A MOSFET-C structure typically requires the MOS devices to be in strong inversion, which might not be feasible given the ultra-low supply voltage requirement. Using switches in the signal path would require voltage boosting to turn on the switches, which raises reliability concerns. The design of highly linear tunable transconductors at very low supply voltages is very challenging. We have thus investigated the use of varactor-R techniques.

Keywords

Series Resistance Strong Inversion Junction Diode Tuning Voltage BSIM Model 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Shouri Chatterjee
    • 1
  • Kong Pang Pun
    • 2
  • Nebojša Stanić
    • 3
  • Yannis Tsividis
    • 3
  • Peter Kinget
    • 3
  1. 1.IIT DelhiNew DelhiIndia
  2. 2.Chinese University of Hong KongHong KongChina
  3. 3.Columbia UniversityNew YorkUSA

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