A trimmable resistor circuit and a method for operating the trimmable resistor circuit are provided. The trimmable resistor circuit includes first sources/drains and first gate structures alternatively arranged in a first row, second sources/drains and second gate structures alternatively arranged in a second row, third sources/drains and third gate structures alternatively arranged in a third row, first resistors disposed between the first row and the second row, and second resistors disposed between the second row and the third row. In the method for operating the trimmable resistor circuit, the first gate structures in the first row and the third gate structures in the third row are turned on. Then, the second gate structures in the second row are turned on/off according to a predetermined resistance value.

A sulfurization detection resistor makes it possible to detect a degree of sulfurization accurately and easily, and a manufacturing method for such sulfurization detection resistor. A sulfurization detection resistor includes an insulated substrate having a rectangular parallelepiped shape, a first front electrode and a second front electrode formed at both ends on a main surface of the insulated substrate, multiple sulfurization detecting conductors connected in parallel to the first front electrode, multiple resistive elements connected between the sulfurization detecting conductors and the second front electrode, and a protective film formed to partially cover the sulfurization detecting conductors and entirely cover the resistive elements. The sulfurization detecting conductors have their sulfurization detecting portions exposed out of the protective film, and different timings are set for these sulfurization detecting portions respectively to become disconnected depending on a cumulative amount of sulfurization.

To provide a resistance device which has a small temperature dependence, in which a resistance value is adjustable in a wide range of from a high resistance value to a low resistance value, and which has a small circuit area, and to provide a current detection circuit including the resistance device. The resistance device is to be connected between two terminals, and a resistance value thereof is variable, the resistance device including: a reference resistor; a series variable resistor circuitry including at least one parallel variable resistor circuit which is connected in series to each other, and which each includes a resistor and a trimming element connected in parallel to the resistor; and a parallel variable resistor circuitry including at least one series variable resistor circuit which is connected in parallel to each other, and which each includes a resistor and a trimming element connected in series to the resistor.

To provide a resistance device which has a small temperature dependence, in which a resistance value is adjustable in a wide range of from a high resistance value to a low resistance value, and which has a small circuit area, and to provide a current detection circuit including the resistance device. The resistance device is to be connected between two terminals, and a resistance value thereof is variable, the resistance device including: a reference resistor; a series variable resistor circuitry including at least one parallel variable resistor circuit which is connected in series to each other, and which each includes a resistor and a trimming element connected in parallel to the resistor; and a parallel variable resistor circuitry including at least one series variable resistor circuit which is connected in parallel to each other, and which each includes a resistor and a trimming element connected in series to the resistor.

A chip resistor has a substrate, a first connection electrode and a second connection electrode that are formed on the substrate, and a resistor network that is formed on the substrate and that has ends one of which is connected to the first connection electrode and the other one of which is connected to the second connection electrode. The resistor network is provided with a resistive circuit. The resistive circuit has a resistive element film line that is provided along inner wall surfaces of trenches. The resistive element film line extending along the inner wall surfaces of the trenches is long and has a high resistivity as a unit resistive element.

A chip resistor has a substrate, a first connection electrode and a second connection electrode that are formed on the substrate, and a resistor network that is formed on the substrate and that has ends one of which is connected to the first connection electrode and the other one of which is connected to the second connection electrode. The resistor network is provided with a resistive circuit. The resistive circuit has a resistive element film line that is provided along inner wall surfaces of trenches. The resistive element film line extending along the inner wall surfaces of the trenches is long and has a high resistivity as a unit resistive element.

A trimmable resistor circuit and a method for operating the trimmable resistor circuit are provided. The trimmable resistor circuit includes first sources/drains and first gate structures alternatively arranged in a first row, second sources/drains and second gate structures alternatively arranged in a second row, third sources/drains and third gate structures alternatively arranged in a third row, first resistors disposed between the first row and the second row, and second resistors disposed between the second row and the third row. In the method for operating the trimmable resistor circuit, the first gate structures in the first row and the third gate structures in the third row are turned on. Then, the second gate structures in the second row are turned on/off according to a predetermined resistance value.

A trimmable resistor circuit and a method for operating the trimmable resistor circuit are provided. The trimmable resistor circuit includes first sources/drains and first gate structures alternatively arranged in a first row, second sources/drains and second gate structures alternatively arranged in a second row, third sources/drains and third gate structures alternatively arranged in a third row, first resistors disposed between the first row and the second row, and second resistors disposed between the second row and the third row. In the method for operating the trimmable resistor circuit, the first gate structures in the first row and the third gate structures in the third row are turned on. Then, the second gate structures in the second row are turned on/off according to a predetermined resistance value.

An analog circuit arrangement (1) to variably set a voltage U.sub.out, within defined voltage limits, has a non-inverting adder (10) with a positive input (11). A voltage divider (20), with at least a first stage (21) and a second stage (22), is connected to the positive input (11) of the adder (10). At least one stage has a parallel circuit of n resistors (R1, R2, . . . , Rn) that are each connected in series in a conduction path (L1, L2, . . . , Ln) to an overcurrent protection device (F1, F2, . . . , Fn). At least one device (30) actively changes one or more of the overcurrent protection devices (F1, F2, . . . , Fn) into a state that interrupts the respective affected conduction path (L1, L2, . . . , Ln).

A method for making resistors includes: forming a protective layer on a metal plate; patterning the metal plate to form a plurality of spaced-apart resistor wires; forming a plurality of bottom parts on the metal plate, each of the bottom parts covering a portion of a respective one of the resistor wires such that the respective resistor wire defines two opposite electrode forming regions; laser-marking the protective layer to form a plurality of identification codes; laser-cutting the protective layer and the metal plate to form a plurality of spaced-apart pre-formed resistors; and forming two terminal electrodes respectively on the two opposite electrode forming regions of each of the resistor wires.