Title :
One microsecond fast acquisition 2.4 GHz low voltage frequency synthesizer for frequency-hopping spread spectrum mobile communications
Author :
Yuen, Chung Ming
Author_Institution :
Dept. of Electron. Eng., City Univ. of Hong Kong, Hong Kong
Abstract :
A fast acquisition frequency synthesizer designed for 2.4 GHz band frequency hopping CDMA handheld phones is discussed. The proposed frequency synthesizer can switch to a new channel within one microsecond while operating at 3 V. In order to achieve fast acquisition, low phase noise and low harmonic content under very low supply voltage, special designed voltage controlled oscillator, frequency doubler and switchable loop filter were adopted for optimum performance. The proposed design is suitable for the low voltage and low power handheld equipment. With minor modification, the design can be applied to other digital cellular applications
Keywords :
UHF filters; cellular radio; code division multiple access; digital radio; frequency hop communication; frequency multipliers; frequency synthesizers; land mobile radio; phase locked loops; spread spectrum communication; telephone sets; voltage-controlled oscillators; 1 mus; 2.4 GHz; 3 V; CDMA handheld phones; UHF; digital cellular applications; dual PLL frequency synthesizer; fast acquisition frequency synthesizer; frequency doubler; frequency-hopping spread spectrum; low harmonic content; low phase noise; low voltage frequency synthesizer; mobile communications; optimum performance; switchable loop filter; very low supply voltage; voltage controlled oscillator; Frequency synthesizers; Low voltage; Multiaccess communication; Phase locked loops; Power harmonic filters; Spread spectrum communication; Switches; Telecommunication switching; Timing; Voltage-controlled oscillators;
Conference_Titel :
TENCON '97. IEEE Region 10 Annual Conference. Speech and Image Technologies for Computing and Telecommunications., Proceedings of IEEE
Conference_Location :
Brisbane, Qld.
Print_ISBN :
0-7803-4365-4
DOI :
10.1109/TENCON.1997.648254
