A new patented balanced input circuit emulates the extremely high common-mode input impedance which gives a quality audio transformer its hum and buzz rejecting advantage in real-world audio systems, where driving source impedances are rarely perfectly balanced. Compared to traditional active balanced circuits, the new circuit can produce CMRR improvements up to 80 dB but is only slightly more complex and requires no additional closely matched components.

Author: Whitlock, Bill
Affiliation: Jensen Transformers, Inc., Van Nuys, CA
AES Convention: 101 (November 1996) Paper Number: 4372
Publication Date: November 1, 1996
Subject: Signal Processing

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