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Low sensitivity complex image rejection filter for GNSS receivers
Affiliation:1. Netas Telecommunication, Research & Development Department, Istanbul, Turkey;2. Istanbul Technical University, Faculty of Electrical-Electronics Engineering, 34469 Maslak, Istanbul, Turkey;1. LaMOS Research Unit, Faculty of exact sciences, University of Bejaia, 06000, Algeria;2. Mathematic, Informatic and Application Laboratory, University of Haute-Alsace, 12 rue des Freres Lumiere, 68093 Mulhouse Cedex, France;3. Autonomic Networking Environment, ICD/ERA, CNRS UMRSTMR 6279, University of Technology of Troyes, 12 rue Marie Curie, 10010 Troyes Cedex, France;1. Le Quy Don Technical University, Hanoi, Viet Nam;2. Vietnam People’s Army Broadcast Center, Viet Nam;1. Department of Electronic Engineering, Jinwen University of Science and Technology, No. 99, Anzhong Road, Xindian Dist., New Taipei City 23154, Taiwan;2. Instrument Technology Research Center, National Applied Research Laboratories, No. 20, R&D Road VI, Hsinchu Science Park, Hsinchu 30076, Taiwan;1. Weinberg Medical Physics LLC, Bethesda, MD 20817, USA;2. Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599, USA
Abstract:In this paper, a new approach for the design of a low sensitivity complex-filter is proposed. The approach is based on realising the filter using low sensitivity allpass sections. The complex filter obtained can be used as image-reject filter in low-IF GNSS receivers. The filter configuration is modular, i.e. is composed of the same subcircuits which simplifies the design of the circuit. A Chebyshev type OTA-C image-reject filter obtained by cascading two third-order allpass-based complex filters is presented. Post layout simulation results of the filter using SPECTRE in CADENCE design tool verifying its proper operation are provided.
Keywords:Complex filters  GNSS receivers  Low-IF receivers  CMOS integrated circuits
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