Analogue circuit linearising nonlinear measurement signal - has resistance network forming two partial currents proportional to sum of input signals

摘要

The analogue linearisation circuit, for a non-linear measuring signal, uses an analogic signal processor (17) supplied with the measuring signal (U1) and a second input voltage (U0) at respective circuit inputs (I0, I2), with a resistance network (R1...R4) for providing corresponding input currents (Iz, Ix). The resistance network (R1...R4) provides the sum of two partial currents proportional to the input currents, with several operational amplifiers (21, 25, 31) to provide a quotient current proportional to the quotient of the two input voltages, multiplied by a normalisation current (Iy). The result is multiplied by a second normalisation current (ISH) and fed to the output amplifier (319 providing the linearised output voltage (V (VOUT). ADVANTAGE - Provides exact linearisation of non-linear measuring signal for physical value.