Title :
UWB Gilbert downconverter utilising a wideband LR-CR quadrature generator
Author :
Syu, J.-S. ; Meng, C. ; Teng, Y.-H.
Author_Institution :
Dept. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu
Abstract :
An ultra-wideband (UWB) I/Q downconverter with an LR-CR quadrature generator is demonstrated using 0.35 mum SiGe HBT technology. The I/Q outputs of this generator are always in quadrature phase at any frequency while the BJT-type active mixer inherently tolerates much LO power difference for a flat gain response. Consequently, the amplitude imbalance and phase error of the I/Q outputs are less than 1 dB and 2deg in the RF frequency range 3-11 GHz.
Keywords :
Ge-Si alloys; electric generators; heterojunction bipolar transistors; mixers (circuits); semiconductor materials; ultra wideband communication; SiGe; SiGe HBT technology; amplitude imbalance; frequency 3 GHz to 11 GHz; phase error; size 0.35 micron; ultrawideband Gilbert downconverter; wideband LR-CR quadrature generator;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2009.0613
