A reconfigurable OTA-C baseband filter with wide digital tuning for GNSS receivers

Pan Wenguang; Ma Chengyan; Gan Yebing; Ye Tianchun

doi:10.1088/1674-4926/31/9/095006

J. Semicond. > 2010, Volume 31 > Issue 9 > 095006

SEMICONDUCTOR INTEGRATED CIRCUITS

A reconfigurable OTA-C baseband filter with wide digital tuning for GNSS receivers

Pan Wenguang, Ma Chengyan, Gan Yebing and Ye Tianchun

+ Author Affiliations

DOI: 10.1088/1674-4926/31/9/095006

Abstract: The design of a digitally-tunable sixth-order reconfigurable OTA-C filter in a 0.18-μm RFCMOS process is proposed. The filter can be configured as a complex band pass filter or two real low pass filters. An improved digital automatic frequency tuning scheme based on the voltage controlled oscillator technique is adopted to compensate for process variations. An extended tuning range (above 8 : 1) is obtained by using widely continuously tunable transconductors based on digital techniques. In the complex band pass mode, the bandwidth can be tuned from 3 to 24 MHz and the center frequency from 3 to 16 MHz.

Key words: reconfigurable filter

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Pan Wenguang, Ma Chengyan, Gan Yebing, Ye Tianchun. A reconfigurable OTA-C baseband filter with wide digital tuning for GNSS receivers[J]. Journal of Semiconductors, 2010, 31(9): 095006. doi: 10.1088/1674-4926/31/9/095006

Pan W G, Ma C Y, Gan Y B, Ye T C. A reconfigurable OTA-C baseband filter with wide digital tuning for GNSS receivers[J]. J. Semicond., 2010, 31(9): 095006. doi: 10.1088/1674-4926/31/9/095006.

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Received: 18 August 2015 Revised: Online: Published: 01 September 2010

The design of a digitally-tunable sixth-order reconfigurable OTA-C filter in a 0.18-μm RFCMOS process is proposed. The filter can be configured as a complex band pass filter or two real low pass filters. An improved digital automatic frequency tuning scheme based on the voltage controlled oscillator technique is adopted to compensate for process variations. An extended tuning range (above 8 : 1) is obtained by using widely continuously tunable transconductors based on digital techniques. In the complex band pass mode, the bandwidth can be tuned from 3 to 24 MHz and the center frequency from 3 to 16 MHz.

A reconfigurable OTA-C baseband filter with wide digital tuning for GNSS receivers

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