"Circuitos integrados Diseño y construcción." . . "Circuits integrats Disseny." . . "teleteknik" . . "Parssinen, Aarno" . . "Circuits integrats." . . "Radiotransmisores Equipo y accesorios Diseño y construcción." . . "Systèmes de télécommunications à large bande Appareils et matériel." . . "Electronic and Computer Engineering." . . "telekommunikationsteknik" . . "Circuits de ràdio Disseny i construcció." . . "Ràdio Receptors i recepció Disseny i construcció." . . "Sistemas de comunicacíon de banda ancha Equipo y accesorios." . . "Ràdioreceptors." . . "Banda ampla, Sistemes de comunicació de Aparells i instruments." . . "Computer engineering." . . "Integrated circuits Design and construction." . . "Integrated circuits Design and construction" . "ANTIQUES & COLLECTIBLES Radios & Televisions." . . "Engineering." . . "Radiorreceptores Equipo y accesorios Diseño y construcción." . . "mobilradio" . . "Radio circuits Design and construction." . . "Radio circuits Design and construction" . "Circuits intégrés Conception et construction." . . "Circuitos de radio Diseño y construcción." . . "Broadband communication systems Equipment and supplies." . . "Broadband communication systems Equipment and supplies" . "digital signalbehandling" . . "Radio Émetteurs-récepteurs Appareils et matériel Conception et construction." . . "Circuit intégré." . . . . . . . . . . . . . "Electronic books"@en . "Electronic books" . . . . . . "Livres électroniques" . . . . . . . . . . . . . . . . . . . . . . . . . . . "Livre électronique (Descripteur de forme)" . . . . . . . . . . . . . "Wide-band systems will be the next significant generation in wireless communications. Those include both wireless local area networks and cellular systems with a large coverage area. They will provide a higher data rate and access to internet and video services, for example. Although most of the data processing is performed digitally, also the requirements and possibilities to implement the analog part of the radio receiver will be different compared to the second-generation narrow-band receivers. Direct conversion architecture is a distinct candidate for wide-band systems because some non-idealities involved in baseband signal processing are significantly relaxed. The requirements and feasibility of direct conversion in wide-band systems are analyzed in this work. The main emphasis is on cellular systems based on direct sequence code division multiple access, but the same principles are generally valid in all receivers for different applications. The basic principles and design methods involved in receiver design are overviewed as well as the most common radio architectures. In a detailed analysis, the fundamental limitations of the direct conversion architecture are analyzed in wide-band signal processing. Especially, the effect of envelope distortion is characterized both with respect to the specific modulation and to the implementation of a downconversion mixer. Downconversion mixer is the key component in direct conversion because it transfers the radio frequency signal immediately down into the baseband after a relatively small gain at the preceding signal processing blocks, which do not provide filtering of the unwanted radio channels within the system band. Both switching mixers and subsampling mixers are analyzed. Direct Conversion Receivers in Wide-Band Systems consists of four different circuit implementations. A subharmonic sampler operating up to 2 GHz is implemented with a GaAs MESFET technology. The second IC is a CMOS low-noise amplifier with an optimized interface to a subsampling mixer. Two BiCMOS implementations of the wide-band direct conversion receiver are given. The first consists of four different chips: RF front-end, analog baseband circuitry and two analog-to-digital converters. In the second chip, all blocks from the low-noise amplifier to the A/D converters are placed on the same die. In that case, an excellent isolation is required between rail-to-rail clock signals and the sensitive RF input." . "Wide-band systems will be the next significant generation in wireless communications. Those include both wireless local area networks and cellular systems with a large coverage area. They will provide a higher data rate and access to internet and video services, for example. Although most of the data processing is performed digitally, also the requirements and possibilities to implement the analog part of the radio receiver will be different compared to the second-generation narrow-band receivers. Direct conversion architecture is a distinct candidate for wide-band systems because some non-idealities involved in baseband signal processing are significantly relaxed. The requirements and feasibility of direct conversion in wide-band systems are analyzed in this work. The main emphasis is on cellular systems based on direct sequence code division multiple access, but the same principles are generally valid in all receivers for different applications. The basic principles and design methods involved in receiver design are overviewed as well as the most common radio architectures. In a detailed analysis, the fundamental limitations of the direct conversion architecture are analyzed in wide-band signal processing. Especially, the effect of envelope distortion is characterized both with respect to the specific modulation and to the implementation of a downconversion mixer. Downconversion mixer is the key component in direct conversion because it transfers the radio frequency signal immediately down into the baseband after a relatively small gain at the preceding signal processing blocks, which do not provide filtering of the unwanted radio channels within the system band. Both switching mixers and subsampling mixers are analyzed. Direct Conversion Receivers in Wide-Band Systems consists of four different circuit implementations. A subharmonic sampler operating up to 2 GHz is implemented with a GaAs MESFET technology. The second IC is a CMOS low-noise amplifier with an optimized interface to a subsampling mixer. Two BiCMOS implementations of the wide-band direct conversion receiver are given. The first consists of four different chips: RF front-end, analog baseband circuitry and two analog-to-digital converters. In the second chip, all blocks from the low-noise amplifier to the A/D converters are placed on the same die. In that case, an excellent isolation is required between rail-to-rail clock signals and the sensitive RF input."@en . . "Ressource Internet (Descripteur de forme)" . . . . . . . . . "Direct conversion receivers in wide-band systems" . . "Direct conversion receivers in wide-band systems"@en . . "Direct Conversion Receivers in Wide-Band Systems" . . . . . . . . "Llibres electrònics" . . . "Wide-band systems seem set to become the next significant generation in wireless communications. They include both wireless local area networks and cellular systems with a large coverage area and will provide a higher data rate and access to Internet and video services, for example. Although most of the data processing is performed digitally, the requirements and possibilities to implement the analogue part of the radio receiver will be different compared to the second-generation narrow-band receivers.; Direct conversion architecture is a distinct candidate for wide-band systems because some non-idealities involved in baseband signal processing are significantly relaxed. This work analyzes the requirements and feasibility of direct conversion in wide-band systems. The main emphasis is on cellular systems based on direct sequence code division multiple access, but the same principles are generally valid in all receivers for different applications. The basic principles and design methods involved in receiver design are overviewed as well as the most common radio architectures. Also, in a detailed analysis, the fundamental limitations of the direct conversion architecture are analyzed in wide-band signal processing." . . . . . . . "Disseny de circuits electrònics." . . "Circuits radio Conception et construction." . . "Radio Transmitter-receivers Equipment and supplies Design and construction." . . "Radio Transmitter-receivers Equipment and supplies Design and construction" . "MyiLibrary (Service en ligne)" . . "Microwaves." . . "Télécommunication sans fil." . . "Circuits de ràdio." . . "Microwaves, RF and Optical Engineering." . . . . "Sistemes de comunicació de banda ampla." . . "Réseau à haut débit." . .