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

Volume

2

fYear

1994

fDate

3-5 Aug 1994

Firstpage

767

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1994., Proceedings of the 37th Midwest Symposium on

Conference_Location

Lafayette, LA

Print_ISBN

0-7803-2428-5

Type

conf

DOI

10.1109/MWSCAS.1994.518928

Filename

518928