Trimming process for thin-film resistance networks - measures port resistances cyclically between trimming steps to approach wanted value from below

摘要

The trimming process, for thin-film resistance networks, has the individual resistors in the symmetric or asymmetric Pi network of resistors adjusted cyclically according to the results obtained by making total resistance measurements between the Pi network three ports. In this way the required resistances for the three ports are gradually approached under the guidance of a set programme and by making resistance measurements between each trimming stage. The adjustments are made such that the total required resistance is approached from below. The method can also be used for thin-film hybrid circuits.