OFFSET ADJUSTING CIRCUIT FOR BRIDGE CIRCUIT OUTPUT VOLTAGE

摘要

Provided is an offset adjusting circuit for a bridge circuit output voltage, which can adjust and set easily the temperature coefficient (TCR) of an offset correcting resistance element. In this bridge circuit output voltage offset adjusting circuit, two sets of series resistance elements having sensitive resistance elements connected in series are connected in parallel between a supply input terminal and a ground terminal, so that the voltages at the medians of the individual series resistance elements are extracted as median voltages. Temperature characteristic adjusting resistance elements for performing the offset so that the medians of the middle point voltage differences may be those of the output ranges of a differential amplifier are arranged in series with the individual series resistance elements at diagonal positions across the individual medians of the individual series resistance elements. The individual temperature characteristic adjusting resistance elements have their temperature coefficients set smaller than those of the series resistance elements. The temperature characteristic adjusting resistance elements are made of a laminated structure of a thin film layer of Ni, Fe and Cr and a thin film layer of Ta or TaN.