A widely-tunable, reconfigurable CMOS analog baseband IC for software-defined radio

Masaki Kitsunezuka, Shinichi Hori, Tadashi Maeda

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


This paper describes a reconfigurable analog baseband (ABB) for a software-defined radio (SDR). A wide variety of filter characteristics needed for SDR can be obtained by a reconfigurable filter based on a newly developed duty-cycle controlled discrete-time transconductor. The ABB, implemented in a 90 nm CMOS process, provides second- and fourth-order Butterworth, Chebyshev, and elliptic responses with bandwidths from 400 kHz to 30 MHz. The chip draws only 12 mA and achieves a P 1dB of +7∼ dBm with a 1.0 V supply. The input-referred integrated in-band noise is 0.31∼ mV rms and the die area is as small as 0.57∼mm2.

Original languageEnglish
Article number5226708
Pages (from-to)2496-2502
Number of pages7
JournalIEEE Journal of Solid-State Circuits
Issue number9
Publication statusPublished - 2009 Sept
Externally publishedYes


  • Analog baseband
  • Discrete-time filter
  • Duty-cycle control
  • Reconfigurable filter
  • Software-defined radio

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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