2.4-GHz Tunable Miniature CMOS Active Bandpass Filter with Two Transmission Zeros Using Lumped Stepped-Impedance Ring Resonator

Yu Chih Hsiao, Chin-Chun Meng, Hsieh Hsiu Chang Chien, Guo Wei Huang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

This paper demonstrates a small-size 2.4-GHz CMOS active bandpass filter with two transmission zeros using a lumped stepped-impedance ring resonator. To obtain low insertion loss and small size, four high-Q active inductors using 0.18 μ m CMOS transistors only are employed in the design. The measured insertion loss is 2.9-dB at 2.4 GHz center frequency with two transmission zeros located at 2.1 GHz and 3.1 GHz, respectively. By tuning the bias currents of active inductors, the center frequency has 1.4 GHz tuning range and the 1-dB bandwidth can be adjusted in the range of 190 MHz to 260 MHz. The demonstrated active filter occupies a small chip area of 0.47 mmx 0.33mm excluding I/O pads and has 24 dB noise figure. Thus, an active filter with a preceding two-stage common-source LNA for suppression of noise of the active filter is also demonstrated and the resulting LNA + active filter has 6 dB noise figure. The power consumption of the active filter core and the LNA cnte is 9 mW and 7.2 mW, respectively.

Original languageEnglish
Title of host publicationProceedings of the 2018 IEEE/MTT-S International Microwave Symposium, IMS 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages405-408
Number of pages4
ISBN (Print)9781538650677
DOIs
StatePublished - 17 Aug 2018
Event2018 IEEE/MTT-S International Microwave Symposium, IMS 2018 - Philadelphia, United States
Duration: 10 Jun 201815 Jun 2018

Publication series

NameIEEE MTT-S International Microwave Symposium Digest
Volume2018-June
ISSN (Print)0149-645X

Conference

Conference2018 IEEE/MTT-S International Microwave Symposium, IMS 2018
CountryUnited States
CityPhiladelphia
Period10/06/1815/06/18

Keywords

  • Active bandpass filter
  • active inductor
  • CMOS
  • ring resonator
  • transmission zero

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