As shown in the figure is the amplifier circuit for gain programmable instrument. The first stage in this circuit uses a low-power instrumentation amplifier INA102 with selectable gain. The four diodes D and 10kΩ in the figure form a 15V clamping circuit. Its function is to achieve overvoltage protection for the input terminal of the first stage INA102, that is, limit the potential of the non-inverting and inverting input terminals of INA102 to ± (15 ± 0.7) Below V, the diode FDH300 with a small leakage current can be selected for the diode in the figure to reduce temperature drift. Corresponding to the circuit shown in the figure, the voltage amplification factor of the first stage (INA102) is l, and various voltage amplification factors can be obtained by changing the logic levels of pins 1 and 2 of PGAl02: 1, 10, and 100.
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