| Summary: | 碩士 === 中華大學 === 電機工程學系碩士班 === 89 === In this thesis, we discuss RF transmitter circuits which including frequency synthesizer and power amplifier, driving amplifier, mixer, band pass filter, vco of direct sequence spread spectrum (DSSS) system, which are essential parts of a DSSS system. The system frequency range from 2.412GHz to 2.484GHz and divided into 14 channels with 5MHz channel spacing.
We use the CLY2 transistor of SIEMENS to design power amplifier and transistor BFP420 of SIEMENS to design driving amplifier. The phase locked loop formed by a NS LMX2326 synthesizer, passive loop filter, reference clock, DELTA vco and 8051 microprocessor circuits. Besides, we use the TOKO ISM band pass filter and MINICIRCUIT ADE-30 mixer to complete a 2.4GHz transmitter. The transmitter can offer 18.37dBm output power, 19.5dB system gain and 18.5dBm P1dB, all of the measurement data meet the 802.11b specification very well.
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