JPH08203712A - Terminating device - Google Patents

Abstract

PURPOSE: To reduce the size, attain higher density and cut down the cost for design, manufacture and components of a terminating device. CONSTITUTION: A ceramic board 20 is used as a capacitor where an electrode layer 21 is formed thereon. Terminating resistors 221 to 223 are installed on the layer 21, thereby forming terminals 231 to 233 respectively. Since this device is in laminated structure, there is no need for through holes or contacts for connection between elements, which makes it possible to simplify the manufacture, reduce the size and attain higher density as well. Due to a monolithic structure, this construction eliminates the need for a printed board wiring between components and enables a signal to be terminated with a good condition (directly near an input terminal of the next stage IC).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal terminating device, and more particularly to a signal terminating device used for terminating a signal in an ECL (emitter coupled logic) circuit.

[0002]

2. Description of the Related Art Although a resistance element is used for terminating an ECL signal, an ECL signal terminating circuit is formed by using it together with a capacitor for noise reduction. In such an ECL signal terminating device, one resistor and one capacitor are prepared for each signal line, and E
This resistor and 1 at the place where the signal termination of the CL circuit is necessary.
A signal terminating device consisting of individual capacitors is provided for each.

In such a structure, when a circuit is realized on a printed circuit board, it is difficult to achieve high-density mounting and downsizing, and because of a mounting space problem, mounting under a favorable condition of the terminating resistor (signal input). It is difficult to terminate the terminal immediately.

As an example for solving such a problem, Japanese Utility Model Laid-Open No. 60-121636 discloses a signal terminating device as shown in FIGS. This device 1
The pattern 3 is formed on both sides of the surface of the ceramic substrate 2, and the capacitor 4 is formed in the ceramic substrate 2.

The pattern 3 comprises a ground electrode 5, a power supply electrode 6, and terminal mounting pads 81, 82, ... Connected to the electrode 6 via resistors 71, 72, .... .

The capacitor 4 is composed of electrodes 9 and 10 which are alternately arranged at a predetermined interval. One electrode 9 is connected to a ground electrode 5 through a blind through hole 11 and the other electrode 10 is the same. It is connected to the power supply electrode 6 through the blind through hole 12.

FIG. 4 shows an equivalent circuit of the device shown in FIG. In this way, the terminating device 1 has the capacitor inside and the resistor is formed on the surface, so that it is possible to make the structure compact and high-density.

[0008]

In the conventional signal terminating device 1 shown in FIGS. 3 and 4, the electrodes 9 and 10 of the capacitor 4 and the resistors 71, 72, ..., The ground terminal 5 and the power supply terminal 6 are provided. Blind through hole 1
However, there is a drawback in that the manufacturing process of the device is complicated and the density of the device is considerably increased, which hinders miniaturization.

An object of the present invention is to provide a signal terminating device which is extremely simple to manufacture, which can be miniaturized and have a high density.

[0010]

A signal terminating device according to the present invention includes a dielectric substrate, a first electrode layer for a capacitor formed on one main surface of the dielectric substrate, and a first electrode layer for the capacitor.
And a plurality of resistors formed on the electrode layer, and each of these resistors is used as a termination resistance element of a plurality of signal lines.

[0011]

A dielectric substrate is used as a capacitor, a capacitor electrode layer is formed on one main surface of the substrate, and a plurality of terminating resistance elements are formed on the capacitor electrode layer. A signal termination device can be realized with a simple configuration.

[0012]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a sectional view of an embodiment of the present invention and its equivalent circuit diagram. Referring to FIG. 1, a conductive layer serving as an electrode of a capacitor is formed on one main surface of a dielectric ceramic substrate 20, and a plurality of termination resistance elements 221, 222, 223, ... Are formed on the conductive layer 21. Are selectively formed.
Further, terminals 231, 232, 233, ... Are formed directly above the respective resistance elements 221, 222, 223 ,.

The electrode layer 21 for the capacitor has a structure in which the terminal 24 can be led out at the left end of the ceramic substrate 20. A terminal 25 is attached and formed on the right end of the ceramic substrate 20 as the other electrode for the capacitor.

FIG. 2 shows an equivalent circuit of the signal terminating device having the configuration of FIG.
2, 223, ... One end 231, 232, 233, ...
Are connected to respective signal lines of an ECL circuit (not shown), and a common connection terminal (also an upper electrode of the capacitor) 24 of each resistance element is connected to a circuit power supply (V). The other electrode terminal 25 of the capacitor C is grounded (GN
By performing D), high frequency noise is reduced.

The other electrode 25 of the capacitor C may be adhered and formed on the other main surface of the dielectric substrate 20 (the surface opposite to the surface on which the upper electrode layer 21 is formed).
The material of 0 is not limited to ceramic, but other dielectric materials can be used.

[0017]

As described above, according to the present invention, since the capacitor and the resistor are integrally formed, the mounting space is reduced, high density mounting is possible, and the wiring of the printed circuit board is provided. There is an effect that it is possible to reduce design costs such as design, manufacturing and component costs.

Further, since the capacitor and the resistor are integrally formed, wiring between the parts is eliminated, and the signal can be terminated under favorable conditions (close to the input end of the next-stage integrated circuit).

Further, since each material has a laminated structure, the signal terminating device can be formed without using through holes or blind through holes for connecting elements.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is an equivalent circuit diagram of FIG.

FIG. 3 is a perspective view showing an example of a conventional signal terminating device.

FIG. 4 is an equivalent circuit diagram of the device of FIG.

[Explanation of symbols]

 20 ceramic substrate 21 electrode layers 24 and 25 terminals 221 to 223 resistance element 231 to 233 resistance terminal

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location H03K 19/086 // H03K 19/0175

Claims (3)

[Claims] 1. A dielectric substrate, a first electrode layer for a capacitor formed on one main surface of the dielectric substrate, and a plurality of resistors formed on the first electrode layer. A signal terminating device, characterized in that each of these resistors is used as a terminating resistor element for a plurality of signal lines. 2. A second capacitor for capacitor is provided on the dielectric substrate.
2. The signal terminating device according to claim 1, wherein the second electrode is connected to a reference potential point. 3. ECL (Emitter Coupled Logic)
Use as a signal termination of a circuit.
Alternatively, the signal terminating device described in 2.