MOS-only complex filter design for dual-band GNSS receivers |
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| Affiliation: | 1. Netas Telecommunication, Research & Development Department, Istanbul, Turkey;2. Istanbul Technical University, Faculty of Electrical-Electronics Engineering, 34469 Maslak, Istanbul, Turkey;1. Dept. of Electrical and Electronics Engineering, Istanbul University, 34340 Istanbul, Turkey;2. Dept. of Electronics and Communications Engineering, Dogus University, 34722 Istanbul, Turkey;1. Department of Microelectronics, Brno University of Technology, Technická 10, Brno, Czech Republic;2. Faculty of Biomedical Engineering, Czech Technical University in Prague, nám. Sítná 3105, Kladno, Czech Republic;3. Faculty of Engineering, King Mongkut''s Institute of Technology Ladkrabang, Bangkok 10520, Thailand;4. Department of Electrical Engineering, Technical University of Cz?stochowa, 42-201 Cz?stochowa, Poland;1. LISIC Lab., Department of Telecommunications, Electronic and Computer Engineering Faculty, USTHB University, 16111 Algiers, Algeria;2. Department of Electronics and Communications Engineering, Istanbul Technical University, 34469 Istanbul, Turkey;1. Department of Naval Architecture and Marine Engineering, Bandirma Onyedi Eylul University,TR-10200 Balikesir, Turkey;2. Department of Electrical and Electronics Engineering, Istanbul University, 34340 Istanbul, Turkey |
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| Abstract: | In this paper, the use of MOS-only active filters in the implementation of area-effective low-IF image reject filters is discussed. For this purpose, complex filter design procedure is considered regarding MOS-only filter realization techniques and a new second-order filter topology which favors filter’s area-effective implementation is proposed. Owing to the presented approach, a new complex image-reject filter with reduced chip area, which can be used in dual-band GNSS receivers, is obtained. Issues related to IQ imbalance are briefly discussed and a calibration imbalance circuit is proposed. By virtue of the current-mode design technique, the IQ imbalance circuit is embedded with the complex filter, simplifying the system topology. In order to illustrate the feasibility of the filter, post-layout simulation results of a fourth-order Butterworth-type image reject filter designed for dual-band GNSS receivers are provided using SPECTRE simulation tool in CADENCE design environment. |
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| Keywords: | Active-only filters Complex filters GNSS receivers Low-IF Receivers Integrated Circuits |
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