Title :
Design and optimization of CMOS switches for switched tuning of LC resonators
Author :
Christensen, Käre Tais
Author_Institution :
Tech. Univ. Denmark, Copenhagen, Denmark
Abstract :
Switched tuning of RF integrated circuits has had a reputation of being inferior compared to continuous varactor tuning due to excessive loss in the switches. This paper models CMOS switches and switched capacitance tuning of LC resonators. Closed form expressions are derived that show what the optimal switch size is and what the corresponding Q-value is. Finally a comparison is made between different layout styles. These results show that switched tuning is a very attractive alternative to varactor tuning
Keywords :
CMOS integrated circuits; Q-factor; circuit optimisation; circuit resonance; circuit tuning; switched capacitor networks; CMOS switch; LC resonator; Q-factor; RF integrated circuit; design optimization; switched capacitance tuning; CMOS integrated circuits; Capacitance; Circuit optimization; Design optimization; Radio frequency; Radiofrequency integrated circuits; Semiconductor device modeling; Switches; Switching circuits; Varactors;
Conference_Titel :
Circuits and Systems, 2001. ISCAS 2001. The 2001 IEEE International Symposium on
Conference_Location :
Sydney, NSW
Print_ISBN :
0-7803-6685-9
DOI :
10.1109/ISCAS.2001.922351
