Title :
2.4/5.7-GHz dual-band dual-conversion architecture with correlated LO signal generators
Author :
Syu, Jin-Siang ; Meng, Chinchun ; Yu, Sheng-Wen ; Wu, Tzung-Han ; Huang, Guo-Wei
Author_Institution :
Dept. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan
Abstract :
A 2.4/5.7-GHz dual-band dual-conversion downconverter is demonstrated using 0.35-mum SiGe heterojunction bipolar transistor (HBT) technology. This downconverter employs a complex dual-conversion system and a complex filter to reject the first and second image signals, respectively. The LO1 frequency is 2.5 times the LO2 frequency and is generated by a divide-by-two divider, a frequency doubler and a single-sideband up-converter. As a result, the correlated LO signals maintain excellent image-rejection performance of the dual-conversion system while only one LO input is needed. The downconverter achieves a 40/39-dB image-rejection ratio of the first image and a 44/46-dB image-rejection ratio of the second image for 2.4/5.7-GHz modes, respectively.
Keywords :
frequency multipliers; heterojunction bipolar transistors; silicon compounds; wireless LAN; SiGe heterojunction bipolar transistor technology; WLAN; correlated LO signal generators; dual-band dual-conversion architecture; dual-band dual-conversion downconverter; dual-conversion system; frequency doubler; image-rejection performance; image-rejection ratio; single-sideband up-converter; Amplitude modulation; Dual band; Filters; Frequency conversion; Germanium silicon alloys; Heterojunction bipolar transistors; Signal generators; Silicon germanium; Topology; Voltage-controlled oscillators; SiGe heterojunction bipolar transistor (HBT); Wireless LAN; dual-band; image rejection; low-IF;
Conference_Titel :
Microwave Symposium Digest, 2009. MTT '09. IEEE MTT-S International
Conference_Location :
Boston, MA
Print_ISBN :
978-1-4244-2803-8
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2009.5165997
