Title :
A novel topology of SiGe phase shifters using vector sum method with ultra-low power consumption for 5GHz applications
Author :
Hettak, K. ; McLelland, S. ; Morin, G.A. ; Stubbs, M.G.
Author_Institution :
Commun. Res. Centre Canada, Ottawa, ON, Canada
fDate :
Sept. 29 2009-Oct. 1 2009
Abstract :
A new type of an active phase shifter is proposed using a vector sum method that utilizes a cascode low-noise amplifier (LNA) circuit as a variable gain amplifier (VGA). The proposed configuration was designed and implemented using a Wilkinson power combiner/divider, a branch-line 3 dB quadrature hybrid coupler and variable gain amplifiers (VGAs) with 90° phase control and around 50-dB gain control. At 5 GHz, the module has a maximum gain of 6.8 dB. The chip is very small, operates with low voltage supplies, and is designed for wireless local area network applications and is fabricated using a commercial 0.35 μm SiGe HBT process.
Keywords :
Ge-Si alloys; gain control; heterojunction bipolar transistors; low noise amplifiers; microwave phase shifters; network topology; phase control; power combiners; power dividers; wireless LAN; HBT process; SiGe; Wilkinson power combiner-divider; branch-line quadrature hybrid coupler; cascode low-noise amplifier circuit; circuit topology; frequency 5 GHz; gain 3 dB; gain control; phase control; phase shifters; size 0.35 mum; ultralow power consumption; variable gain amplifier; vector sum method; wireless local area network applications; Circuit topology; Coupling circuits; Energy consumption; Gain; Germanium silicon alloys; Low-noise amplifiers; Phase shifters; Power amplifiers; Power combiners; Silicon germanium;
Conference_Titel :
Microwave Conference, 2009. EuMC 2009. European
Conference_Location :
Rome
Print_ISBN :
978-1-4244-4748-0
