A wide tuning range GmC filter for multi-mode CMOS direct-conversion wireless receivers

Tien Yu Lo*, Chung-Chih Hung, Mohammed Ismail

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

75 Scopus citations


A third-order channel selection filter for multi-mode direct-conversion receivers is presented. The filter is designed with a Butterworth prototype and with the target wireless applications of Bluetooth, cdma2000, Wideband CDMA, and IEEE 802.11a/b/g/n wireless LANs. Linear-region MOS transistors are used to perform voltage-to-current conversion. The wide tuning range is achieved by the current multipliers and linear voltage-to-current converters. Implemented in the TSMC 0.18\ μ m CMOS process, the measurement results show that the filter can operate successfully over a cutoff frequency range of 500∼kHz to 20 MHz, and is compliant with the requirements of different wireless applications. The power consumption is 4.1 mW to 11.1 ∼mW for minimum and maximum cutoff frequencies respectively from a 1.2 V supply voltage. The circuit performance compares favorably with previously reported works.

Original languageEnglish
Article number5226756
Pages (from-to)2515-2524
Number of pages10
JournalIEEE Journal of Solid-State Circuits
Issue number9
StatePublished - 1 Sep 2009


  • Current multiplier
  • Direct-conversion receiver
  • Multi-mode
  • Transconductor
  • Wide tuning range

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