Voltage_controlled_low_pass_filter

Published:2009/7/17 3:10:00 Author:Jessie | From:SeekIC

This circuit performs as a unity-gain buffer amplifier at frequencies below cutoff, with the cutoff frequency being the point at which XC/gm equals the closed-loop gain of (R/RA). At frequencies above cutoff, the circuit provides a single RC rolloff (6 dB per octave) of the input signal with a -3-dB point that is defined by the given equation, where gm (of the XR-13600, Fig. 11-1B) is 19.2× IB at room temperature. EXAR Corporaton Databk 1990, p 5-254.



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