High Input Impedance of Broadband Amplifier Circuit

Published:2011/5/4 7:30:00 Author:Joyce | Keyword: High Input, Impedance, of Broadband, Amplifier, FX110 | From:SeekIC

High input impedance of broadband amplifier circuit is shown in the graph below.The first level is a voltage follower, with the typical value of input bias current 1nA ,difference-mode input resistance 1012Ω, input capacitance 1.5 pF and small signal bandwidth 20MHz. The second level has negative feedbacks, and C2 will constitute a feed-forward compensation. The potentiometer is used to adjust the offset voltage of FX110.The accuracy of resistance R1, R2 is 1%.



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