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 Q/sub 0//sup 2/ improvement in dynamic range over the OTA-C filter, where Q/sub 0/ 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.
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