Книга Circuit Design for RF Tranceivers
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Circuit Design for RF Tranceivers
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Книги Электротехника и связь
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Год издания: 2001
Формат: pdf
Издат.: Kluwer Academic Publishers
Страниц: 342
Размер: 14.13
ISBN: 0792375513
Язык: Английский
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One of the key parts in a mobile telecommunication terminal is the transceiver. The term transceiver stems from the words transmitter and receiver. These words refer to the main task of a transceiver. In the context of a mobile telecommunication terminal, the receiver transforms the signals coming from the antenna into signals which can then be converted into the digital domain. The transmitter converts the analog version of the digital data stream at baseband into a signal at radio frequencies, and delivers this signal to the antenna with a certain amount of power. The frequency bands ranged from several kHz up to a few 100 MHz. Transceivers for mobile telecommunication started to appear in the 1980s, with the development of DECT and GSM standards. These and other telecommunication standards for mobile telephony used instead radio frequencies between 800 MHz and 3 GHz. Another difference between these transceivers and those of previous generations is that they were integrated on silicon, instead of being made with discrete components. The first integrated transceivers were designed in bipolar processes, eventually combined with GaAs technology. The transceiver itself consisted of several ICs. With the demand for higher data rates, attempts were made to develop wireless data standards using concepts similar to those used in the successful mobile telecommunication standards. To achieve high data rates, the radio frequency was increased, resulting in the 5 GHz carrier frequency for HiPerLAN/2 (or IEEE 802.11a) with data rates up to 54 Mb/s. Another wireless standard is Bluetooth (or IEEE 802.11&) where the primary goal was to obtain a standard which can be produced at very low cost.
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 toksoft
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14 июля 2010
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