DESIGN AND SIMULATION OF 2.4GHz CMOS FREQUENCY SYNTHESIZER FOR S BAND APPLICATION

VLSI Design

The frequency synthesizer is an electronic system for generation of one or more frequencies from one reference frequency sources. The frequency synthesizers are an essential part of any modern communication system. They are found in many modern devices like radio receiver, satellite receiver, wireless network devices, GPS system etc. The frequency synthesizer, which performs the main role of carrier generation. With the increasing demand for low cost and high performance of wireless transceiver building blocks, the low-power requirement is a great concern for radio-frequency integrated circuit (RFIC) designers. Intensive effort has been made to develop RF integrated circuits and systems in the higher frequency (GHz) range using the low-cost CMOS process. Another concern for frequency synthesiser is phase noise. The performance in power consumption and channel selection of frequency synthesizer are limited by the two most important building blocks, namely the programmable frequency divider and the voltage-controlled oscillator (VCO). The objective of this research work is to design this critical blocks for the frequency synthesizer with low power requirement. Softwere to be used is LTSpice Specially 2.40-2.50 GHz band is ISM band, so we can develope system in this band with 5MHz reference frequency.

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