Title :
A Polar Loop Transmitter with Digital Interface including a Loop-Bandwidth Calibration System
Author :
Akamine, Y. ; Tanaka, Shoji ; Kawabe, Masahiko ; Okazaki, Tadatsugi ; Shima, Yuji ; Masahiko, Y. ; Yamamoto, Manabu ; Takano, Ryousei ; Kimura, Yuichi
Author_Institution :
Hitachi, Tokyo
Abstract :
An RFIC with digital interface for GSM/EDGE is presented. The architecture is a polar loop transmitter and a direct conversion receiver. The transmitter draws 100mA in GSM and 130mA in EDGE modes. A loop-bandwidth calibration system that can keep the variation of the loop bandwidth to less than plusmn10% after a few microseconds calibration period is applied. The RFIC also contains a timing-control circuit to avoid having a zero PA output amplitude during the switching between GSM and EDGE
Keywords :
3G mobile communication; cellular radio; radio transmitters; radiofrequency integrated circuits; 100 mA; 130 mA; EDGE; GSM; RFIC; digital interface; direct conversion receiver; loop-bandwidth calibration system; polar loop transmitter; timing-control circuit; Bandwidth; Calibration; Counting circuits; Frequency; GSM; Mobile handsets; Radiofrequency integrated circuits; Signal generators; Transmitters; Voltage-controlled oscillators;
Conference_Titel :
Solid-State Circuits Conference, 2007. ISSCC 2007. Digest of Technical Papers. IEEE International
Conference_Location :
San Francisco, CA
Print_ISBN :
1-4244-0853-9
Electronic_ISBN :
0193-6530
DOI :
10.1109/ISSCC.2007.373437
