A switched-capacitor band-pass biquad filter using a simple quasi-unity gain amplifier

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Abstract

This paper presents a switched-capacitor (SC) band-pass biquad using a simple quasi-unity gain amplifier. In sub-nanometer CMOS technologies the intrinsic gain of the transistors is low; this increases the difficulty of designing high gain amplifiers. The proposed SC filter is based on the Sallen-Key biquad and it requires only a simple low gain amplifier. A differential filter circuit, including a suitable amplifier based on a fullydifferential voltage-combiner is presented and analyzed. The correct functionality of this circuit is validated through electrical simulations of a second-order band-pass filter. These simulations show that, for a clock frequency of 100 MHz, the frequency response of the circuit is similar to the corresponding prototype filter.

Original languageEnglish
Title of host publicationTechnological Innovation for the Internet of Things
Subtitle of host publication4th IFIP WG 5.5/SOCOLNET Doctoral Conference on Computing, Electrical and Industrial Systems, DoCEIS 2013, Costa de Caparica, Portugal, April 15-17, 2013. Proceedings
EditorsL. M. Camarinha-Matos, S. Tomic, P. Graça
Place of PublicationBerlin, Heidelberg
PublisherSpringer-Verlag
Pages582-589
Number of pages8
ISBN (Electronic)978-3-642-37291-9
ISBN (Print)978-3-642-37290-2
DOIs
Publication statusPublished - 2013
Event4th IFIP WG 5.5/SOCOLNET Doctoral Conference on Computing, Electrical and Industrial Systems, DoCEIS 2013 - Costa de Caparica, Portugal
Duration: 15 Apr 201317 Apr 2013

Publication series

NameIFIP Advances in Information and Communication Technology
PublisherSpringer-Verlag
Volume394
ISSN (Print)1868-4238

Conference

Conference4th IFIP WG 5.5/SOCOLNET Doctoral Conference on Computing, Electrical and Industrial Systems, DoCEIS 2013
CountryPortugal
CityCosta de Caparica
Period15/04/1317/04/13

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Keywords

  • Analog circuits
  • Band-pass Sallen-Key
  • Switched-capacitor circuits
  • Voltage-combiner amplifier

Cite this

Serra, H., Paulino, N., & Goes, J. (2013). A switched-capacitor band-pass biquad filter using a simple quasi-unity gain amplifier. In L. M. Camarinha-Matos, S. Tomic, & P. Graça (Eds.), Technological Innovation for the Internet of Things: 4th IFIP WG 5.5/SOCOLNET Doctoral Conference on Computing, Electrical and Industrial Systems, DoCEIS 2013, Costa de Caparica, Portugal, April 15-17, 2013. Proceedings (pp. 582-589). [A064] (IFIP Advances in Information and Communication Technology; Vol. 394). Berlin, Heidelberg: Springer-Verlag. https://doi.org/10.1007/978-3-642-37291-9_63