Abstract
An accurate current feedback amplifier based high-Q active bandpass filter whose centre frequency is independently variable over a wide frequency range is presented. The basic circuit has the important advantage that access to the Z node of the current-feedback amplifier is not required, as is the case with many existing current-feedback amplifier filter circuits. Additionally, the circuit can be implemented with operational amplifiers, though for high Q the Q− and ω0− variabilities are 62% better with current-feedback amplifiers than with operational amplifiers. Experimental results are presented which are in good agreement with expected theory.
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