Multimode Gm-C channel selection filter for mobile applications in 1-V supply voltage

Tien Yu Lo*, Chung-Chih Hung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


A CMOS transconductor for multimode channel selection filter is presented. The transconductor includes a voltage-to-current converter and a current multiplier. Voltage-to-current conversion employs linear region MOS transistors, and the conversion features high linearity over a wide input swing range. The current multiplier which operates in the weak inversion region provides a wide transconductance tuning range without degrading the linearity. A third-order Butterworth low-pass filter implemented with the transconductors was designed by TSMC 0.18-μm CMOS process. The measurement results show that the filter can operate with the cutoff frequency of 135 kHz to 2.2 MHz. The tuning range and the linearity performance would be suitable for the wireless specifications of GSM, Bluetooth, cdma2000, and wide-band CDMA. In the design, the maximum power consumption at the highest cutoff frequency is 2 mW under a 1-V supply voltage.

Original languageEnglish
Pages (from-to)314-318
Number of pages5
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Issue number4
StatePublished - 1 Apr 2008


  • Channel-selection filter
  • Linear current multiplier
  • Low voltage
  • Mobile application
  • Transconductor
  • Wide tuning range

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