Low sensitivity complex image rejection filter for GNSS receivers

Aydin O., Ali U. E.

AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS, vol.95, pp.126-138, 2018 (SCI-Expanded) identifier identifier


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. (C) 2018 Elsevier GmbH. All rights reserved.