Abstract: WLAN standard allows high-speed wireless connectivity that is used in IEEE802.11/a/b/g Tx/Rx for Wireless local Area Network.Specifics of WLAN is working in 2.4GHz and 5GHz with high data rate, 54Mb/s. 11a and 11g are the same but their difference is in their bands (5 GHz and 2.4 GHz, respectively). 11b standard is working in 2.4GHz. An important part of high frequency Tx/Rx is Frequency-synthesizer that is used as a circuit for modulate high frequency signals accurately. One kind of Frequency-synthesizer that is used widely in Tele-communication IC is PLL. PLL is a control system that generate output siagnal that phase is proportional to input signal. This block can be used to demodulate a signal, detection of received signal from a noisy Tele-communication channel, generate an output signal in multiple of frequency of input signal and distribute accurately closk signal in digital circuit as is used in microprocessor. Designed Frequency-synthesizer in this project is worked as should be in WLAN standard further more a new integer-n divider is proposed that decrease power of this block noticeably. In 5GHz band we have a phase noise of -112 dBc/Hz and in 2.4GHz band we have a phase noise of -116 dBc/Hz. This frequency synthesizer consumes 11.5mw power at 1.8V power supply
PARALLEL TITLE PROPER
Parallel Title
Design of a Phase Locked Loop for frequency synthesizer in IEEE۸۰۲.۱۱a/b/g