NASA NTRS · 19690000130
Tunable bandpass filter with variable selectivity
Abstract
Basic active RC networks constructed from stages that realize second-order transfer functions using two integrators offer excellent stability. Modifications of the basic network produce a highly stable bandpass filter having separate controls that independently adjust center frequency, Q, and center frequency gain.
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Kerwin, W. J., Shaffer, C. V.. 1969-05-01. Tunable bandpass filter with variable selectivity. https://ntrs.nasa.gov/citations/19690000130
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