Norton_high_corrtmon_mode_voltage_difference_amplifier

Published:2009/7/25 2:06:00 Author:Jessie | From:SeekIC

In this circuit, the Norton amplifies the difference in voltage between V1 and V2, but both inputs can be riding on a common-mode (chapter 10) level as high as about 250 Vdc without exceeding the maximum input current. By making the bias current (ISET) directly proportional to the input level, a 20-dB CMRR improvement is possible (when R1 is adjusted for maximum CMRR at the maximum input common-mode voltage).



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