2GHZ PLL Frequency Synthesizer for Zigbee Applications

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Provided by: The International Journal of Innovative Research in Computer and Communication Engineering
Topic: Networking
Format: PDF
ZigBee is an emerging short distance wireless communication technology. It is mainly used for short range, low power consumption and low transfer rate data applications A low power 2GHz PLL frequency synthesizer for Zigbee/IEEE 802.15.4 applications is presented. The current starve VCO is used to decrease power consumption and to improve noise characteristic of the synthesizer. The synthesizer employs a 1 MHz fully programmable divider with an improved TSPC 2/3 prescaler, a novel bit-cell for the programmable counters and PFD, charge pump and passive loop filter to reduce the PLL reference spurs.
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