JPH03283588A - Hybrid integrated circuit - Google Patents

Abstract

PURPOSE:To easily perform a trimming work in short time by laminating first, second resistors through an insulting layer in a partly overlapping manner, simultaneously trimming the overlapped resistors to vary the ratio of resistances of both the resistors, and deciding a base voltage. CONSTITUTION:A second resistor 29 is connected in parallel with a conductor 24 together with a first resistor 27. Both the resistors 27, 29 are linearly symmetrical as seen in plane, and partly overlapped. The other end of the resistor 29 is connected to a conductor 23 through a conductor 31. When the base voltage of a transistor 22 is decided, if the overlapped parts of the resistors 27, 29 are trimmed, the resistances of the resistors 27, 29 are increased, but the increasing width R1 of the resistance of the resistor 27 is larger than that R2 of the resistance of the resistor 29, and R1> R2. Thus, the ratio of the resistances of the resistor 27 to the resistor 29 can be easily decided by one trimming.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION Field of Industrial Application The present invention relates to hybrid integrated circuits, and more particularly to hybrid integrated circuits suitable for laser trimming.

(Prior Art) Generally, as a hybrid integrated circuit, one having a structure in which a resistor and the like are provided by a thick film technique in which a resistor paste is printed and baked on an insulating substrate is known. In such a hybrid integrated circuit, after electronic components and the like are mounted, the functional trimming resistor is trimmed using a laser or the like to set the resistance value according to the intended use.

FIG. 2 shows an example of a conventional hybrid integrated circuit.

1 in the figure is a ceramic substrate as an insulating substrate.

On this substrate there is a conductor 3. connected to the emitter of transistor 2. conductor 4 connected to the base of transistor 2
．． A conductor 5 connected to the collector of transistor 2. and a conductor 6 are formed respectively. In addition, 8a and 4a in the figure
, 5a are pad portions of the conductors 3 to 5, respectively.

Further, on the substrate, a first resistor 7. is arranged in parallel with the base. The second resistors 8 are each formed by printing. Here, the other end of the first resistor 7 is connected to the conductor 3, and the second resistor 8 is connected to the conductor 61. Note that 9 in the figure is a printed resistor that connects the conductors 5 and 6.

In a hybrid integrated circuit having such a configuration, transistor 2
To determine the base voltage of both resistors 7 and 8, at least one of the first resistor 7 or the second resistor 8 is trimmed with a laser as shown by arrows A and B in the figure.
This is done by determining the ratio of the resistances.

However, when trimming both of the resistors 7, 8, it is necessary to program the positions of the resistors 7, 8, respectively. Furthermore, if the trimming resistance is determined and exceeds the limit during trimming, it is necessary to trim either one of the resistors 7 and 8 to correct it. Therefore, problems arise in that a series of trimming programs become complicated, and the trimming time also increases, reducing work efficiency.

(Problems to be Solved by the Invention) The present invention has been made in view of the above circumstances.
A configuration in which resistors are laminated with some overlap through an insulating layer, and both overlapped resistors are simultaneously trimmed to change the ratio of the respective resistances of both resistors to determine the base voltage. It is an object of the present invention to provide a hybrid integrated circuit that can perform trimming operations easily and in a short time.

[Structure of the Invention] (Means and Effects for Solving the Problems) The present invention provides a transistor including an insulating substrate, a base, an emitter, and a collector formed on the insulating substrate, and a transistor connected in parallel to the base. The first and second resistors are laminated with an insulating layer interposed therebetween, partially overlapping each other, and both resistors are removed by simultaneously trimming the overlapped resistors. This is a hybrid integrated circuit characterized in that the base voltage is determined by changing the ratio of each resistance of the body.

According to the present invention, the first and second resistors are laminated so as to partially overlap with each other through an insulating layer, and both overlapped resistors are simultaneously trimmed to adjust the ratio of the respective resistances of both resistors. By adopting a configuration in which the base voltage is determined by changing the base voltage, trimming work can be performed easily and in a short time.

(Embodiment) A hybrid integrated circuit according to an embodiment of the present invention will be described below with reference to FIG.

21 in the figure is a ceramic substrate as an insulating substrate. On this substrate there is a conductor 23 . connected to the emitter of transistor 22 . A conductor 24 connected to the base of transistor 22. A conductor 25 connected to the collector of transistor 22. and a conductor 26 are formed, respectively. In addition,
23a, 24a, and 25a in the figure are conductors 23 to 25a, respectively.
This is the pad portion of No. 25.

Furthermore, an L-shaped first resistor (shaded portion) 27 is formed on the substrate, and both ends thereof are connected to the conductor 24 and 26, respectively. A printed resistor 28 connected to the conductors 25 and 26 is formed on the substrate.

On the substrate, an inverted-shaped second resistor 29 is provided with an insulating layer (
(within the two-dot chain line) 30. The second resistor 29 and the first resistor 27 are connected in parallel to the conductor 24 . In addition, both resistors 27.2
9 are line-symmetrical to each other when viewed in plan, and are formed with some overlap. The other end of the second resistor 29 is
It is connected to the conductor 23 via a conductor 31.

In a hybrid integrated circuit having such a configuration, transistor 2
2 is determined by trimming the overlapping portion (where the diagonal lines intersect) of the first resistor 27 and the second resistor 29, for example, as shown by arrows A-H. In this way, when trimming in the direction of arrow A and then trimming in the direction of arrow B, the resistor 27.29
The resistance of the first resistor 27 increases ΔR, which is larger than the resistance increase ΔR2 of the second resistor 29, and ΔR>ΔR2. Thus, according to the hybrid integrated circuit according to the above embodiment, the first and second resistors.

27 and 29 are laminated in a partially overlapping manner via an insulating layer 30, and both overlapped resistors are simultaneously trimmed to change the ratio of the respective resistances of both resistors to determine the base voltage. Thereby, the ratio of the resistance of the first resistor 27 and the resistance of the second resistor 29 can be easily determined by one-time trimming. Furthermore, if the ratio of the resistances of both resistors 27 and 29 exceeds the desired value, the purpose can be achieved by performing trimming in the direction opposite to arrow B.

In the above embodiments, the shapes of the first and second resistors are L-shaped and inverted-shaped, respectively, and are line symmetrical, but the present invention is not limited thereto. For example, both resistors may simply overlap, and do not need to be line symmetrical.

Further, the method of trimming is not limited to the direction as in the above embodiment, but may be any direction as long as it changes the ratio of the resistances of both resistors.

[Effects of the Invention] As detailed above, according to the present invention, the first and second resistors are laminated so as to partially overlap each other with an insulating layer interposed therebetween, and both of the overlapping resistors are simultaneously trimmed. By adopting a configuration in which the base voltage is determined by changing the ratio of the respective resistances of both resistors, it is possible to provide a hybrid integrated circuit that can be trimmed easily and in a short time.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a hybrid integrated circuit according to an embodiment of the present invention, and FIG. 2 is a plan view of a conventional hybrid integrated circuit. 21... Ceramic substrate, 22... Transistor,
23゜24, 25.26.31...Conductor, 27...
First resistor, 29... second resistor, 30... insulating layer.

Claims (1)

[Claims] The transistor includes an insulating substrate, a transistor including a base, an emitter, and a collector formed on the insulating substrate, and first and second resistors connected in parallel to the base. The base voltage is determined by changing the ratio of the respective resistances of both resistors by simultaneously trimming both resistors overlapped with each other with an insulating layer in between. Hybrid integrated circuit.