Title :
Dynamic range of high-Q OTA-C and enhanced-Q LC RF bandpass filters
Author :
Kuhn, W.B. ; Stephenson, F.W. ; Elshabini-Riad, A.
Author_Institution :
Bradley Dept. of Electr. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA
Abstract :
Dynamic range limitations of high-Q operational transconductance amplifier capacitor (OTA-C) active bandpass filters are reviewed, and expressions are derived relating the dynamic range to the power consumed by the active circuitry. Similar expressions are then derived for the case of inductor/capacitor (LC) filters whose Q have been increased through active, negative resistance circuitry. It is shown that for a fixed power consumption and bandwidth, the enhanced-Q LC filter realizes a factor of Q02 improvement in dynamic range over the OTA-C filter, where Q0 is the quality factor of the passive LC circuit. The reasons for the improvement are discussed and the importance of the improvement is illustrated for active RF bandpass filters employed in radio receiver applications
Keywords :
Q-factor; active filters; active networks; band-pass filters; biquadratic filters; negative resistance devices; radio receivers; radiofrequency filters; active negative resistance circuitry; dynamic range; enhanced-Q LC RF bandpass filters; high-Q OTA-C active bandpass filters; operational transconductance amplifier capacitor filters; power consumption; quality factor; radio receiver applications; Band pass filters; Capacitors; Circuits; Dynamic range; High power amplifiers; Operational amplifiers; Passive filters; Radio frequency; Radiofrequency amplifiers; Transconductance;
Conference_Titel :
Circuits and Systems, 1994., Proceedings of the 37th Midwest Symposium on
Conference_Location :
Lafayette, LA
Print_ISBN :
0-7803-2428-5
DOI :
10.1109/MWSCAS.1994.518928
