Title :
Reconfigurable RFICs for frequency-agile VCOs in Si-based technology for multi-standard applications
Author :
Mukhopadhyay, R. ; Park, Y. ; Sen, P. ; Srirattana, N. ; Lee, S. ; Nuttinck, S. ; Joseph, A.J. ; Cressler, J.D. ; Laskar, J.
Author_Institution :
Georgia Electron. Design Center, Georgia Inst. of Technol., Atlanta, GA, USA
Abstract :
This paper presents novel reconfigurable RFICs for intelligent radio applications. It includes a new fully tunable active inductor (TAI) along with frequency-agile VCOs. The ICs are implemented on both 0.18 μm Si-CMOS and 0.18 μm SiGe-BiCMOS technologies. The novelty of the TAI lies in the use of a tunable active feedback resistor that results in inductances tunable from 0.1 nH to 15 nH with Q < 50 in C-band. Very wideband reconfigurable VCOs have been implemented using the proposed active inductor, and also with a switched-spiral topology. The VCO tuning ranges are as high as 4 GHz in the C-band. Analysis of the results, taking into account the technologies as well as the circuit topologies, is also presented.
Keywords :
CMOS integrated circuits; elemental semiconductors; inductors; network topology; radio applications; radiofrequency integrated circuits; voltage-controlled oscillators; 0.18 micron; C-band; Si-CMOS; Si-based technology; SiGe; SiGe-BiCMOS technology; VCO tuning range; active feedback resistor; circuit topology; frequency agility; frequency-agile VCO; inductances tuning; intelligent radio applications; reconfigurable RFIC; switched-spiral topology; tunable active inductor; wideband reconfigurable VCO; Active inductors; Circuit optimization; Circuit topology; Feedback; Frequency; Radiofrequency integrated circuits; Resistors; Tunable circuits and devices; Voltage-controlled oscillators; Wideband;
Conference_Titel :
Microwave Symposium Digest, 2004 IEEE MTT-S International
Print_ISBN :
0-7803-8331-1
DOI :
10.1109/MWSYM.2004.1338856
