Title :
Analog base band processor with trimming-free filters for CDMA/FM cellular phone systems
Author :
Katakura, Masayuki ; Tanabe, Sin´ichi ; Matsumoto, Isao ; Saijo, Kazuyuki ; Yoshizawa, Atsushi ; Mogi, Yoshiaki
Author_Institution :
Sony Corp., Tokyo, Japan
Abstract :
This paper presents an analog base band processor for dual-mode code division multiple access (CDMA)/FM cellular phone systems. The processor interfaces between the intermediate-section and the digital processing circuitry of the telephone. By employing an unique filter circuitry technology, the precise and stable CDMA/FM filter characteristics in the RX/TX blocks have been realized with a trimming-free procedure. This analog base band processor has been designed and fabricated by using a 0.8 μm pure bipolar process named ECLA with npn type transistors performance with fT as high as 14 GHz. By such technologies, its power consumption is reduced to as low as 132 mW at the CDMA RX/TX mode
Keywords :
analogue processing circuits; bipolar analogue integrated circuits; cellular radio; code division multiple access; frequency modulation; low-pass filters; radio receivers; radio transmitters; radiofrequency filters; 0.8 micron; 132 mW; 14 GHz; CDMA/FM cellular phone systems; CDMA/FM filter characteristics; ECLA; analog base band processor; bipolar process; code division multiple access; digital processing circuitry; filter circuitry technology; low pass filters; npn type transistors; power consumption; receiver/transmitter mode; spread spectrum communications; trimming-free filters; BiCMOS integrated circuits; Cellular phones; Clocks; Energy consumption; Filters; Frequency; Multiaccess communication; Signal processing; Spread spectrum communication; Telephony;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 1996. PIMRC'96., Seventh IEEE International Symposium on
Conference_Location :
Taipei
Print_ISBN :
0-7803-3692-5
DOI :
10.1109/PIMRC.1996.568436
