A 250 MHz 14 dB-NF 73 dB-gain 82 dB-DR analog baseband chain with digital-assisted DC-offset calibration for ultra-wideband

Horng Yuan Shih*, Chien-Nan Kuo, Wei Hsien Chen, Tzu Yi Yang, Kai Chenug Juang

*Corresponding author for this work

Research output: Contribution to journalArticle

45 Scopus citations

Abstract

A 250 MHz analog baseband chain for Ultra-Wideband was implemented in a 1.2 V 0.13 μ m CMOS process. The chip has an active area of 0.8 mm 2. In the analog baseband, PGAs and filters are carried out by current-mode amplifiers to achieve wide bandwidth and wide dynamic range of gain, as well as low noise and high linearity. Besides, a current-mode SallenKey low-pass filter is adopted for effective rejection of out-of-band interferers. A 6th-order Chebyshev low-pass filter realized in Gm-C topology is designed in the baseband chain for channel selection. Digitally-assisted DC-offset calibration improves second-order distortion of the entire chain. The design achieves a maximum gain of 73 dB and a dynamic range of 82 dB. Measured noise figure is 14 dB, an IIP3 of -6 dBV, and IIP2 of -5 dBV at the maximum gain mode. The analog baseband chain consumes 56.4 mA under supply of 1.2 V.

Original languageEnglish
Article number5405150
Pages (from-to)338-350
Number of pages13
JournalIEEE Journal of Solid-State Circuits
Volume45
Issue number2
DOIs
StatePublished - 1 Feb 2010

Keywords

  • Analog baseband
  • Analog filter
  • Current-mode VGA
  • Current-mode filter
  • DC offset calibration
  • Ultra wideband

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