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An Adaptive Impedance Tuning CMOS Circuit for ISM 2.4-GHz Band.
- Source :
-
IEEE Transactions on Circuits & Systems. Part I: Regular Papers . Jun2005, Vol. 52 Issue 6, p1115-1124. 10p. - Publication Year :
- 2005
-
Abstract
- The difficulties encountered in matching an antenna to its optimal impedance are reduced with an adaptive 0.35-μm CMOS circuit based on several switched shunt capacitors arranged in capacitor banks and on a few external series inductors. As high-quality inductors are difficult to obtain in CMOS, the inductors are placed either in an low-temperature cofired ceramic (LTCC) substrate or is a lumped component outside the core circuit. The circuits, presented here through a range of simulations, are optimized to function within the ISM 2.4-GHz band, but the general approach employed to improve matching can be used for other frequency bands as well. The circuits discussed provide a VSWR ≤ 2 match for every impedance with VSWR ≤ 5. There is a 1-dB power Loss for a perfect 50 Ω → 50 Ω transformation, a break-even point at VSWR = 1.5, and a 3-dB increase in delivered power for VSWR = 4.3. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 15498328
- Volume :
- 52
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Circuits & Systems. Part I: Regular Papers
- Publication Type :
- Periodical
- Accession number :
- 17394122
- Full Text :
- https://doi.org/10.1109/TCSI.2005.849116