Down-conversion self-oscillating mixer by using CMOS technology

Kouchaki, Mohammadreza; Zahedi, Ali; Sabaghi, Masoud; Ameri, S. R. Hadian; Niyakan, M.

doi:10.1109/cspa.2012.6194685

Cited by 1 publication

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References 14 publications

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“…Observing these engineering solutions, it is possible to conclude that, in order to increase the battery lifetime, special care must be taken with the RF transceivers, from hardware to software. In hardware level, the most power hungry circuit inside the transceiver is the power amplifier that is often narrow band and Efforts have been made to merge essential RF functions and examples of this trend is shown in [5] [ 6]. In all these works, the power amplifier is clearly separate from the other circuits.…”

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confidence: 99%

Study and design of CMOS RF power circuits and modulation capabilities for communication applications

Madureira

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This work presents the study, design and measurement of RF circuits aiming communications applications. The need for flexible and reconfigurable RF hardware leads to the need of alternative transmitter architectures. In the center of this innovative architecture, there is the power oscillator. This circuit is composed of a power amplifier in a positive feedback loop so it oscillates. As the circuit under study is mainly composed of a power amplifier, a study on power amplifier is mandatory. Modern CMOS technologies impose difficulties in the efficient RF generation due to low breakdown voltages. In order to reduce the voltage stress on the transistors, waveform engineering techniques are used leading to the use of class EF2. The design and measurement of a class EF2 power amplifier and power oscillator are shown. The circuits were implemented in standard STMICROLECTRONICS 0.13µm CMOS. Correct behavior for the circuits were obtained in measurement, leading to a first implementation of class EF2 in RF frequencies. From a system perspective, the proposed architecture is shown to be flexible and able to generate different modulations without change in the hardware. Reconfigurability is shown not only in modulation but also in output power level. The limitations of this architecture are discussed and some mathematical modeling is presented. RESUMÉ Dans lère des systèmes de communication multi-standards, le besoin des circuits en radio fréquence (RF) flexibles et réconfigurables pousse l'industrie et l'academie à la recherche d'architectures alternatives d'émetteurs et récepteurs RF. Dans cette thèse, nous nous intéréssons aux émetteurs RF fléxibles. Nous présentons une architecture basée sur l'utilisation d'un oscillateur de puissance composé dt'un amplificateur de puissance dans une boucle de rétroaction positive. Pour des raisons de compatibilité avec des circuit numériques et dans le but de minimiser les coûts de fabrication, nous avons choisi la technologie CMOS. Ce choix impose des difficultés de concéption de circuits en RF à cause des faibles tensions de claquage. Cette contrainte de concéption nous a motivé à choisir la classe EF2 pour l'amplificateur de puissance afin de réduire le stress de tension sur les transistors. Nous présentons la concéption de cet amplificateur de puissance de classe EF2 ainsi que l'oscilateur de puissance. Nous validons cette architecture avec une implémentation en technologie CMOS 0.13um de STMicroelectronics. Nous démontrons le bon comportement par mesure et tests du circuit fabriqué. Ce circuit répond aux contraintes de fléxibilité de modulation et de puissance de sortie pouvant donc être utilisée pour différents standards de communications. Les limitations inhérentes de cette architecture sont discutées et une modélisation mathématique est présentée.

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Section: List Of Symbolsmentioning

confidence: 99%

Study and design of CMOS RF power circuits and modulation capabilities for communication applications

Madureira

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Down-conversion self-oscillating mixer by using CMOS technology

Cited by 1 publication

References 14 publications

Study and design of CMOS RF power circuits and modulation capabilities for communication applications

Study and design of CMOS RF power circuits and modulation capabilities for communication applications

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