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MAT04FSZ Datasheet(PDF) 7 Page - Analog Devices |
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MAT04FSZ Datasheet(HTML) 7 Page - Analog Devices |
7 / 12 page MAT04 –7– REV. D Figure 4. Temperature Independent Current Sink, IOUT = 10 V/R Ω NONLINEAR FUNCTIONS An application where precision matched-transistors are a power- ful tool is in the generation of nonlinear functions. These circuits are based on the transistor’s logarithmic property, which takes the following idealized form: V kT q In l l BE C S = The MAT04, with its excellent logarithmic conformance, main- tains this idealized function over many decades of collector current. This, in addition to the stringent parametric matching of the MAT04, enables the implementation of extremely accu- rate log/antilog circuits. The circuit of Figure 5 is a vector summer that adds and sub- tracts logged inputs to generate the following transfer function: VV V OUT A B =+ 1 2 22 This circuit uses two MAT04 and maintains an accuracy of better than 0.5% over an input range of 10 mV to 10 V. The layout of the MAT04s reduces errors due to matching and temperature differences between the two precision quad matched transistors. Op amps A1 and A2 translate the input voltages into logarithmic valued currents (IA and IB in Figure 5) that flow through tran- sistor Q3 and Q5. These currents are summed by transistor Q4 ( IO = IA + IB = ll 1 2 2 2 + ), which feeds the current-to-voltage converter consisting of op amp A3. To maintain accuracy, 1% metal-film resistors should be used. |
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