Piezo_ceramic_based_filter_with_differential_network

Published:2009/7/24 12:56:00 Author:Jessie | From:SeekIC

This circuit is an improved version of the Fig. 7-10 circuit. With the Fig. 7-11 circuit, a portion of the input is fed to the noninverting input of A1. The RC network at this input looks like the ceramic-resonantor impedance when it is off null, As a result, A1 sees similar signals for out-of-band inputs. The high-frequency roll-off of Fig. 7-11 is smooth and about 20 dB deeper than the Fig. 7-10 filter at 475 kHz. The low-frequency side of resonance has similar characteristics at 375 kHz and below. Linear Technology Corporation, 1991, AN47-48.



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