A dual-mode complex filter for GNSS receivers with frequency tuning

Gan Yebing; Ma Chengyan; Yuan Guoshun

doi:10.1088/1674-4926/30/10/105004

J. Semicond. > 2009, Volume 30 > Issue 10 > 105004

SEMICONDUCTOR INTEGRATED CIRCUITS

A dual-mode complex filter for GNSS receivers with frequency tuning

Gan Yebing, Ma Chengyan and Yuan Guoshun

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DOI: 10.1088/1674-4926/30/10/105004

Abstract: A fifth/seventh order dual-mode OTA-C complex filter for global navigation satellite system receivers is implemented in a 0.18 μm CMOS process. This filter can be configured as the narrow mode of a 4.4 MHz bandwidth center at 4.1 MHz or the wide mode of a 22 MHz bandwidth center at 15.42 MHz. A fully differential OTA with source degeneration is used to provide sufficient linearity. Furthermore, a ring CCO based frequency tuning scheme is proposed to reduce frequency variation. The measured results show that in narrow-band mode the image rejection ratio (IMRR) is 35 dB, the filter dissipates 0.8 mA from the 1.8 V power supply, and the out-of-band rejection is 50 dB at 6 MHz offset. In wide-band mode, IMRR is 28 dB and the filter dissipates 3.2 mA. The frequency tuning error is less than ±2%.

Key words: complex filter

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Shang Haiping, Xu Qiuxia. SBH adjustment characteristic of the dopant segregation process for NiSi/n-Si SJDs[J]. Journal of Semiconductors, 2010, 31(5): 056001. doi: 10.1088/1674-4926/31/5/056001

Shang H P, Xu Q X. SBH adjustment characteristic of the dopant segregation process for NiSi/n-Si SJDs[J]. J. Semicond., 2010, 31(5): 056001. doi: 10.1088/1674-4926/31/5/056001.

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Received: 18 August 2015 Revised: 20 May 2009 Online: Published: 01 October 2009

A fifth/seventh order dual-mode OTA-C complex filter for global navigation satellite system receivers is implemented in a 0.18 μm CMOS process. This filter can be configured as the narrow mode of a 4.4 MHz bandwidth center at 4.1 MHz or the wide mode of a 22 MHz bandwidth center at 15.42 MHz. A fully differential OTA with source degeneration is used to provide sufficient linearity. Furthermore, a ring CCO based frequency tuning scheme is proposed to reduce frequency variation. The measured results show that in narrow-band mode the image rejection ratio (IMRR) is 35 dB, the filter dissipates 0.8 mA from the 1.8 V power supply, and the out-of-band rejection is 50 dB at 6 MHz offset. In wide-band mode, IMRR is 28 dB and the filter dissipates 3.2 mA. The frequency tuning error is less than ±2%.

A dual-mode complex filter for GNSS receivers with frequency tuning

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A dual-mode complex filter for GNSS receivers with frequency tuning

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A dual-mode complex filter for GNSS receivers with frequency tuning

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