Title :
1μs fast acquisition 2.4 GHz low voltage frequency synthesizer for FH-CDMA mobile communications
Author :
Yuen, Chung Ming ; Wong, ChakNam ; Tsang, Kim Fung
Author_Institution :
Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, Hong Kong
Abstract :
This paper discussed the design of a fast acquisition frequency synthesizer for frequency hopping CDMA in the 2.4 GHz band. The frequency synthesizer can make channel switching 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, specially designed voltage controlled oscillator, frequency doubler and switchable loop filter were adopted for optimum performance. Measurements on the prototype showed that the acquisition time was 0.79 μs. 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, such as DCS-1800 handsets
Keywords :
UHF circuits; cellular radio; code division multiple access; digital radio; frequency hop communication; frequency synthesizers; transceivers; 0.79 to 1 mus; 2.4 GHz; 3 V; DCS-1800 handsets; FH-CDMA mobile communications; VCO; channel switching; digital cellular applications; fast acquisition synthesizer; frequency doubler; frequency hopping CDMA; low harmonic content; low phase noise; low power handheld equipment; low voltage frequency synthesizer; switchable loop filter; voltage controlled oscillator; Frequency synthesizers; Low voltage; Low-noise amplifiers; Mobile communication; Multiaccess communication; Phase locked loops; Power harmonic filters; Switches; Transceivers; Voltage-controlled oscillators;
Conference_Titel :
Microwave Conference Proceedings, 1997. APMC '97, 1997 Asia-Pacific
Print_ISBN :
962-442-117-X
DOI :
10.1109/APMC.1997.659367
