Measured CMOS Switched High-Quality Capacitors in a Reconfigurable Matching Network

Switched capacitors are here investigated for use in reconfigurable matching networks, particularly for digital video broadcasting-handheld (DVB-H) frequencies. A 0.13-μm CMOS circuit is evaluated through both simulations and measurements. Source grounded nMOS transistors are used to switch high-qua...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. II, Express briefs Express briefs, 2007-10, Vol.54 (10), p.858-862
Main Authors: Sjoblom, Peter, Sjoland, Henrik
Format: Article
Language:English
Subjects:
Capacitors
Circuit optimization
Circuit simulation
CMOS
Digital video broadcasting
digital video broadcasting-handheld (DVB-H)
DVB-H
Electrical Engineering, Electronic Engineering, Information Engineering
Elektroteknik och elektronik
Engineering and Technology
Frequency
Matching
MEMS
microelectromecanical systems (MEMS)
MOSFETs
Networks
Q factor
Quality factor
switched capacitor
Switched capacitor networks
Switches
Switching theory
Teknik
Transistors
Tuning
Voltage
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Summary:Switched capacitors are here investigated for use in reconfigurable matching networks, particularly for digital video broadcasting-handheld (DVB-H) frequencies. A 0.13-μm CMOS circuit is evaluated through both simulations and measurements. Source grounded nMOS transistors are used to switch high-quality metal capacitors located above metal layer 8. The quality factor and tuning range depend on frequency, switch voltage, capacitor size, and transistor width. There is a clear tradeoff between quality factor and tuning range, and measurements show quality factors above 50, 100, and 150 at tuning ranges of 3.9, 2.4, and 1.6, respectively. A reconfigurable matching network with the switched capacitors has been realized using external inductors and the measured matching domain for the DVB-H frequency band is shown. The total loss of the network is 1.0 dB, a result of the high-quality switched capacitors.
ISSN:1549-7747
1558-3791
DOI:10.1109/TCSII.2007.901629