Person: García Alberdi, Coro
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García Alberdi
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Coro
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Ingeniería Eléctrica y Electrónica
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9714
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Publication Open Access Low power channel selection filtering for highly integrated wireless receivers(2013) García Alberdi, Coro; López Martín, Antonio; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta ElektronikoaIn this research work, low-voltage and low-power techniques have been applied to implement novel analog circuits, mainly Gm-C filters. The structure of the thesis follows a bottom-up scheme: basic techniques at device level are proposed in the first place, followed by the introduction of novel circuit topologies at cell level, and finally the achievement of new designs at system level. At device level the main contribution of this work is the employment of Floating-Gate (FG) and Quasi-Floating-Gate (QFG) transistors in order to reduce the power consumption. By using them, new topologies are proposed at cell level, being a high-performance tunable class AB transconductor well adapted to low power and low voltage environments the most important one. This circuit employs a resistive divider implemented by MOS transistors operating in triode region as tuning scheme. Regarding system level, new designs have been achieved by employing these novel cells. In fact, as a final result, this dissertation introduces a new tunable highly-linear third-order Butterworth low-pass Gm-C filter, suitable for channel selection filtering in a Zero-IF receiver. Automatic tuning systems are also proposed to improve it. Moreover, a VGA is also implemented by employing the same basic cell. It operates with constant bandwidth for all the gain settings. Both are important blocks in a Zero-IF wireless receiver. All the proposed circuits have been fabricated using a 0.5μm doublepoly n-well CMOS technology, and the corresponding measurement results are provided and analyzed to validate their operation. Furthermore, different approaches to obtain the final designs are discussed together with theoretical analysis to fully explore the potential of the resulting circuits and systems in the scenario of low-power low-voltage applications.Publication Restricted Filtros CMOS integrados de muy bajo consumo para selección de canal en receptores Bluetooth y Zigbee(2009) García Alberdi, Coro; López Martín, Antonio; Escuela Técnica Superior de Ingenieros Industriales y de Telecomunicación; Telekomunikazio eta Industria Ingeniarien Goi Mailako Eskola Teknikoa; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa