JPS63238705A - Composite circuit part - Google Patents

Abstract

PURPOSE:To miniaturize and simplify a composite circuit part by mounting a filter circuit having specific filter characteristics, a filter characteristic changing element for displaying different filter characteristics by coupling itself with the filter circuit and a means for optionally and selectively connecting said element with the filter circuit on a dielectric base. CONSTITUTION:The composite circuit part 1 is constituted of the filter circuit consisting of inductance elements L1, L2 and capacitors C1, C2, C4 arranged on a conductive layer on the dielectric base 2, the filter characteristic changing element consisting of a chapacitor C3 and a switching circuit consisting of a transistor TR1. Plural lead wires 3-6 connected to conductive layers formed on both the faces of the base 2 are protruded to the outside almost in parallel with the base 2. In addition, the filter circuit or the like is connected to the external circuit through the lead wire 3-6.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Field of Application) The present invention provides a method for disposing a filter circuit and a switching circuit having different filter characteristics, which are used, for example, in a color television receiver, on the same substrate. The present invention relates to a formed composite circuit component.

(Prior Art) For example, in order to be able to view a single color television broadcast using a single color television receiver, it is necessary to
Since the band of the carrier signal differs depending on the difference between AL and NTSC, the delay line with a trap or the low-pass filter used in the luminance signal circuit must have characteristics compatible with each of the above-mentioned color systems.

Therefore, conventionally, one color television receiver has a delay line low-pass filter circuit with a toshi trap for PAL and a delay line low-pass filter circuit with a trouble trap for NTSC, which have different filter characteristics, and a switch ink to switch between these two circuits. These circuits were provided as discrete circuits on separate substrates, and the switch ink circuit was used to switch between them as necessary.

- However, according to the conventional circuit configuration described above, each circuit is configured separately on another board as described above, so the area occupied on the other board is large, and the number of components is reduced accordingly. As a result, there were problems such as an increase in costs due to an increase in man-hours, a longer adjustment time, and an increase in costs due to an increase in the number of parts.

(Problems to be Solved by the Invention) As detailed above, depending on the conventional circuit configuration, in addition to the problems caused by forming each circuit on a separate board, Alternatively, when the low-pass filter circuit and the switching circuit are connected to each other, there is a problem that the matching between the respective circuits is poor.

Therefore, an object of the present invention is to provide a composite circuit component that solves each of the above-mentioned problems.

[Structure of the Invention] (Means for Solving the Problems) The structure of the present invention for solving the above problems is to provide a filter circuit having specific filter characteristics including L and C on one dielectric substrate. The present invention is characterized in that it includes a filter characteristic changing element that exhibits different filter characteristics when combined with the filter circuit, and a switching circuit that optionally connects the filter characteristic changing element to the filter circuit.

(Function) The function of the present invention having the above configuration is to combine a filter circuit and a switching circuit, which have conventionally been separate circuit components, with different filter characteristics by configuring them on the same dielectric substrate. .

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of an embodiment of the composite circuit component of the present invention.

In the figure, a composite circuit component 1 includes: - a dielectric substrate 2 made of, for example, ceramic, formed with a conductive layer extending on both sides; Inductors L1 and L2 are arranged, and a capacitor C1, which will be described later.

C2 and C4 (not shown), and has a specific filter characteristic; a filter characteristic changing element consisting of a capacitor C3 (not shown), which will be described later, coupled to this filter circuit; and a transistor TRt. It consists of a switching circuit. Incidentally, on this dielectric substrate 2, a plurality of lead wires 3 to 6, each of which is suitably electrically connected to a conductive layer formed on both surfaces of this dielectric substrate 2, are arranged approximately parallel to this dielectric substrate 2. It is provided to protrude to the outside. The filter circuit and the like are connected to an external circuit via the plurality of lead wires 3 to 6.

Note that the hatched portion in the figure is the conductive layer formed on the front surface, and the dotted line portion is the conductive layer formed on the back surface.

FIG. 2 is an explanatory diagram of the dielectric substrate 2 with circuit elements mounted on the composite circuit component 1 shown in FIG. 1 omitted.

The capacitors C1 to C4 briefly described above are inter-substrate capacitors composed of a dielectric substrate 2 and conductive layers formed on the front and back surfaces of the dielectric substrate 2, respectively.

To explain in detail, first, the capacitor C1 is formed of a conductive layer 7 formed on the back surface of the dielectric substrate 2 and a conductive layer 9 formed on the surface opposite to this conductive layer 7, and similarly, the capacitor C2 is formed of the By the conductive layer 7 and the conductive layer 8, the capacitor c3 is divided into two parts: a part 03'' formed by the conductive layer 12 and the conductive layer 11, and a part C3' formed by the conductive layer 8 and the conductive layer 12, Similarly, the capacitor C4 is divided into two parts: a part 04' formed by the conductive layer 8 and the conductive layer 32, and a part 04'' formed by the conductive layer 32 and the conductive N layer 33.

FIG. 3(a) is an equivalent circuit diagram of the composite circuit component mounted as described above.

That is, one end of the inductor L1 is connected to the terminal 3, and one end of each of the inductor L2, capacitor C3', capacitor 04', and capacitor C2 mentioned above is connected to the other end of this inductor L1. . One end of the capacitor C3'' is connected in series to the other end of the capacitor C3', and the collector terminal of the transistor TR1 is connected to the other end of the capacitor C3''. One end of the capacitor C4'' is connected in series to the other end of the capacitor C4', and the emitter terminal of the transistor TR1 is connected to the other end of the capacitor C4''. The emitter terminal of this transistor TR1 is connected to the capacitor C3''.
, C4'', the other end of the inductor 12, and the terminal 5 are connected. That is, the capacitor C3, the capacitor Ca, and the inductor L2 are connected in parallel.

On the other hand, the other end of the capacitor C2 is connected to the terminal 4 and one end of the capacitor C1, and the other end of the capacitor C1 is connected to the center tap of the inductor L1. Note that here, the capacitor C3 acts as a filter characteristic changing element, and the transistor TR1 acts as a switching circuit. In the figure, a portion indicated by a dashed line 30 is a filter circuit having specific filter characteristics.

Note that FIG. 2B shows details of the transistor TR1.

FIGS. 4(a), (b) and 5(a) show the functions and effects of the composite component configured as described above.

(This will be explained with reference to b>.

FIG. 4(a) is a circuit diagram constructed when the transistor TR1 as the switching circuit mentioned above is turned off, and FIG. 4(b) is a circuit diagram constructed when the transistor TRI is turned on. Illustrated. And, Fig. 5 (a>, (b)
) is shown in Figure 4(a).

FIG. 7B is a filter characteristic diagram corresponding to the circuit configuration shown in FIG.

In this embodiment, the transistor TR1 as a switching circuit has a 0
By using the N10FF, it is possible to optionally configure either the PAL filter circuit shown in FIG. 4(a) or the NTSC filter circuit shown in FIG. 4(b).

To be more specific, when the transistor TR1 is in the OFF state, the capacitor C3 (C3
', C3''), and the capacitor connected to inductor L2 is capacitor C4 (C4', C3'').
In other words, the circuit configuration is as shown in FIG. 4(a), and its filter characteristics are as shown in FIG. 5(a>).

On the other hand, when the transistor TRI is in the ON state, the capacitor C3 (C3', C3
), and the capacitors connected to the inductor L2 are capacitor C4 (C4', Ca") and capacitor C3 (C3').

C3'') becomes a capacitor when connected in parallel.

That is, the circuit configuration is as shown in FIG. 4(b), and its filter characteristics are as shown in FIG. 5(b). In this way, different filter characteristics can be obtained.

According to the above configuration, since the common circuit parts of two filter circuits having different filter characteristics are shared on the same substrate from the beginning, and the different circuit parts are arbitrarily connected by the switching circuit, It is possible to design a circuit that takes into account in advance the problem of compatibility when connecting another filter circuit provided externally later, as in the conventional case. In addition, since each of the circuits described above is formed on the same substrate,
It is possible to reduce the number of parts and downsize. In general, since the substrate is a dielectric substrate, part or all of the capacitors constituting the filter circuit can be used as inter-substrate capacitors, which can contribute to miniaturization.

FIG. 6 is a plan view of a second embodiment of the composite circuit component of the present invention.

The illustrated embodiment of the composite circuit component includes a dielectric substrate 13 made of, for example, ceramic and formed with conductive layers extending on both sides.
A resistor R3, a resistor R4, an inductor L4 . A filter circuit that has specific filter characteristics and is composed of an inductor L6, an inductor L7, and inter-substrate capacitors C6 to C1o (described later), and an inter-substrate capacitor C5 (
(to be described later), a filter characteristic changing element consisting of an inductor L5, and a transistor T connected between the conductive layer on the back side.
It is composed of a switching circuit consisting of R2. Further, the terminals 3 to 6 described above are provided on the dielectric substrate 13 so as to protrude to the outside substantially parallel to the dielectric substrate 13.

FIG. 7 is an explanatory diagram of the dielectric substrate 13 in which the circuit components on which the composite circuit components shown in FIG. 6 are mounted are omitted.

The capacitors C5 to C1o each have a dielectric substrate 1.
3 and conductive layers formed on the front and back surfaces of the dielectric substrate 13.

Specifically, the capacitor C5 is formed by a conductive layer 22 formed on the back surface of the dielectric substrate 13 and a conductive layer 21 formed on the surface opposite to this conductive layer. 15 and the conductive layer 20,
Capacitor C7 is formed by conductive layer 15 and conductive layer 23, capacitor CB is formed by conductive layer 15 and conductive layer 24, and capacitor C9 is formed by conductive layer 15 and conductive layer 25.
It is formed by Capacitor C+o is conductive layer 1
6 and the conductive layer 20, and a portion C1o'' formed by the conductive layer 16 and the conductive layer 26.
It is divided into two parts, each formed separately. Note that the terminal 6 is connected to a conductive layer 14 formed on the back surface, and similarly, the terminal 5 is connected to the conductive layer 19, the terminal 4 is connected to the conductive layer 15, and the terminal 3 is connected to the conductive layer 27.

FIG. 8 is an equivalent circuit diagram of the above-mentioned composite circuit component.

That is, one end of a resistor R4 is connected to the terminal 3, and the other end of this resistor R4 is connected to an inductor L4 and one end of a capacitor C1o'' of a capacitor Coo connected in parallel with the inductor L4. Inductor L
At the other end of L7.4, there is an inductor L7. One end of each of capacitor C+o' of capacitor C6 and capacitor C1o is connected. Roughly speaking, one end of a capacitor 09 is connected to the center tap of the inductor L4, and one end of a capacitor C7 is connected to the center tap of the inductor L7. And the above capacitor Ca, capacitor C
7. The other end of each capacitor C9 is connected to the terminal 4.

The terminal 5 is connected to the other end of the inductor L7, and one end of the inductor L6, inductor Ls, and resistor R3. On the other hand, a capacitor C8 is connected to the other end of the inductor L6, and a capacitor C8 is connected to the other end of the inductor L5.
5 are connected in series. This capacitor C
The collector terminal of a transistor TR2 is connected to the other end of the transistor TR2, and the emitter terminal of the transistor TR2 is connected to the terminal 4.5.
It is connected to the other end of the capacitor CB, the other end of the resistor R3, and the pace terminal. In addition to the above-mentioned circuit elements, a terminal 6 is connected to the base terminal of the transistor TR2. Incidentally, the series connection of the inductor L5 and capacitor C5 acts as a filter characteristic changing element, and the transistor TR2 acts as a switching circuit.

A portion indicated by a dashed-dotted line 31 in the figure is a filter circuit having specific filter characteristics.

The functions and effects of the composite circuit component configured as described above will be explained with reference to FIG. 8 and FIGS. 9(a) and (b).

The difference between this embodiment and the previous embodiment is that in the embodiment, the transistor TRz, which is a switching circuit,
Whereas two filter characteristics were obtained by optionally connecting the capacitor C3 connected to the collector terminal of R1, in this embodiment, the transistor T
The point is that R2 optionally couples together a common imaging element, which is a filter characteristic changing element, and is constituted by an inductor L5 and a capacitor C5. Therefore, in the circuit configured when the transistor TR2 is turned off and the circuit configured when the transistor TR2 is turned on, the resonant The circuit configuration may or may not include elements.

Specifically, when the transistor TR2 is in the OFF state, no current flows through the series resonant circuit consisting of the inductor L5 and the capacitor C3, which serve as filter characteristic changing elements. That is, the filter characteristics shown in FIG. 9(a>) are obtained.

On the other hand, when the transistor TR2 is in the ON state, the inductor L5 and capacitor Cs, which are filter characteristic changing circuits,
Current also flows through the series resonant circuit consisting of
This results in the filter characteristics shown below. In this way, two filter circuits having different filter characteristics can be obtained.

According to the above configuration, two filter circuits having different filter characteristics are shared on the same substrate from the beginning, and the different circuit parts are arbitrarily connected by the switching circuit. It is possible to design a circuit that takes into account in advance the problem of compatibility when connecting another filter circuit provided externally later, as in the conventional case. Furthermore, since each of the circuits described above is formed on the same substrate, it is possible to reduce the number of parts and downsize the device. Furthermore, since the substrate is a dielectric substrate, part or all of the capacitors constituting the filter circuit can be used as inter-substrate capacitors, which can contribute to miniaturization.

It should be noted that the present invention is not limited to the illustrated embodiments described above, and various modifications can be made within the scope of the gist of the present invention.

FIG. 10 is a plan view showing a composite circuit component according to a modified example of the present invention.

The composite circuit component 34 shown in the same figure and the composite circuit component 1 shown in FIG. Part 1
The difference from this is in the filter characteristic changing element. That is, in the composite circuit component 34 shown in FIG. 10, the filter characteristic changing element is the inductor L1o. This inductor 1o is provided across a conductive layer 35 and a conductive layer 36 formed on the surface of a dielectric substrate 41.

Capacitor Ct+ constituting another filter circuit 30'
to CI3 (C13', C+3'') are the 11th
As shown in the figure, a capacitor Ct+ is provided between the conductive layer 35 formed on the front surface and a conductive layer 37 formed on the back surface facing the surface, and a capacitor CI is similarly provided between the conductive layer 37 and the conductive layer 38.
2, and the conductive layer 35, the conductive layer 40, and the conductive layer 39
There are capacitors C+3' and C+3'' (
C+3> is formed.

The equivalent circuit diagram of the composite circuit component consisting of the above configuration is shown in the 12th
It is as shown in the figure.

In the figure, when the transistor TR3 is in the 0" state, the inductor L+ as a filter characteristic changing element
No current flows through the capacitor (d3 (C+3')) connected to the inductor L9.

In other words, the circuit configuration is as shown in FIG. 13(a).

On the other hand, when the transistor TR3 is in the ON state, current also flows through the inductor Lxo, which is a filter characteristic changing element, and the capacitor Cl5 (C13', C13',
C+3") and the inductor L+o are connected in parallel. In other words, the circuit configuration is shown in FIG. 13(b). Different filter characteristics can be obtained as described above. Even if L+o is used as a filter characteristic changing element, substantially the same effect as in the above-described embodiment can be obtained.

As another modification, for example, a composite circuit component shown in FIG. 14 may be used.

The illustrated composite circuit component includes an inductor 11 disposed as appropriate on each conductive layer formed on the surface of a dielectric substrate 50.
Inductor L12 and inter-board capacitors 01a to CI
6 and having specific filter characteristics, and an inter-board capacitor CI?6 optionally connected to this filter circuit. (C17', C+7''
), a filter characteristic changing circuit consisting of an inductor L13, and a switching circuit consisting of the aforementioned transistor TRa.

FIG. 15 is an explanatory diagram in which circuit components mounted on the composite circuit component shown in FIG. 14 are omitted.

In the figure, the capacitor Cs4 is formed of a conductive layer 46 formed on the back surface and a conductive layer 42 formed on the surface opposite to this conductive layer, and similarly the capacitor Cs4
is a capacitor 0 due to the conductive layer 46 and the conductive layer 43.
1B is formed by a conductive layer 46 and a conductive layer 44. On the other hand, the capacitor C17 includes a portion C17' formed by the conductive layer 47 and the conductive layer 42, and a portion C17' formed by the conductive layer 47 and the conductive layer 4.
5 and the portion CI? “It was divided into two parts,
each formed.

FIG. 16 is an equivalent circuit diagram of the above-mentioned composite circuit component.

That is, one end of the inductor Lo is connected to the terminal 3, and the inductor L12° and the inductor upper 13 are connected to the other end.
．． One end of the capacitor Cza capacitor C17' is connected to the collector of the transistor TR4. The emitter terminal of this transistor TRa is connected to the capacitor C17.
' One end of which is connected in series with the capacitor C1? '' and the other end of the inductor L13. That is, the capacitor C17 and the inductor L13 are connected in parallel, and the other ends of each are connected to the terminal 5.On the other hand, the inductor L12 The other end of the capacitor C16' is connected to one end of the capacitor C16', and the other end of this capacitor Cps is connected to the terminal 4, the other end of the capacitor Cta, and one end of the capacitor Cts.
The other end of 15 is configured to be connected to the intermediate tap of the inductor Lt1. Incidentally, a portion indicated by 31' in the figure is a filter circuit having specific filter characteristics.

Even if a composite circuit component having such a configuration, that is, an inductor L13 and a capacitor C17 connected in parallel is used as a filter characteristic changing element, substantially the same effect as the above-described embodiment can be obtained. can.

[Effects of the Invention] As detailed above, according to the composite circuit component of the present invention, the problem of consistency when conventionally each circuit is placed on a separate board can be solved, and the composite circuit can be miniaturized and simplified. We can provide parts.

[Brief explanation of drawings]

FIG. 1 is a plan view of a composite circuit component according to an embodiment of the present invention, FIG. 2 is a front view of a board from which mounted circuit components are omitted from the composite circuit component shown in FIG. 1, and FIG. 4(b) is a detailed diagram of the transistor TRt shown in FIG. 1, and FIGS. 4(a> and 4(b) are circuit diagrams each configured by the 0N10FF state of the switching circuit. ,
Figures 5(a) and (b) are filter characteristic diagrams corresponding to Figures 4(a> and (b), respectively), Figure 6 is a plan view of the composite circuit component according to the second embodiment of the present invention, and Figure 7 is FIG. 6 is a front view of the board with mounted circuit components omitted from the composite circuit component shown in FIG. 6, FIG. 8 is an equivalent circuit diagram of the composite circuit component shown in FIG. 6, and FIG.
) and (b) are filter characteristic diagrams obtained by the composite circuit component shown in FIG. 6, FIG. 10 is a plan view of a modified example of the composite circuit component of the present invention, and FIG. 11 is a diagram of the composite circuit shown in FIG. 10. 12 is an equivalent circuit diagram of the composite circuit component shown in FIG. 10, and FIGS. 13(a) and 13(b) are the zero diagrams of the switching circuit in FIG. 10.
Circuit diagram each configured by N10FF state, 1st
4 is a plan view of another modified example of the composite circuit component of the present invention, FIG. 15 is a front view of a board from which the mounted circuit components are omitted from the composite circuit component shown in FIG. 14, and FIG. 16 is the same as in FIG. 14. FIG. 3 is an equivalent circuit diagram of the composite circuit component shown in FIG. 1... Composite circuit component, 2.13, 41, 50... Dielectric substrate, 30.31.
30', 31'...filter circuit, C3, C5, L
s, LIO1C17, L13... filter characteristic changing element, TR1, TR2, TR3, TR4... switching circuit. Figure 3 (G) Figure 4 Figure 1O Figure 735 Figure 11 Figure 12 Figure 13 Figure 12 Figure 13 1, L12 L12 Figure 14 Figure 124 End Figure 16

Claims (5)

[Claims] (1) A filter circuit including L and C having specific filter characteristics on one dielectric substrate, a filter characteristic changing element that exhibits different filter characteristics by coupling with this filter circuit, and this filter characteristic changing element and a switching circuit that optionally connects the filter circuit to the filter circuit. (2) The composite circuit component according to claim 1, wherein the filter characteristic changing element is a capacitor C. (3) The composite circuit component according to claim 1, wherein the filter characteristic changing element is an inductor L. (4) The composite circuit component according to claim 1, wherein the filter characteristic changing element is an inductor L and a capacitor C connected in series. (5) The composite circuit component according to claim 1, wherein the filter characteristic changing element is an inductor L and a capacitor C connected in parallel.