the internal equivalent circuit of NJM4200 multiplier

Published:2011/7/10 3:44:00 Author:chopper | Keyword: internal, equivalent circuit, multiplier | From:SeekIC

Figure shows the internal equivalent circuit of NJM4200, and the chip includes logarithmic amplifiers and so on. Function of the Logarithmic amplifier is to use the logarithmic relationship of voltage and current of PN,and add and subtract logarithm of current,then do the logarithmic transformation for the result.The transition function of NJM4200 is I3＝(I1I2)/I4,and the input/output range is 1μA～1mA.NJM4200 may be damaged when the input current is more than 5mA,while the frequency characteristics is poor when small signal level is in use,therefore, we should use it near the full-scale as possible as we can.



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