JPH07111423A - High frequency converter - Google Patents

Abstract

PURPOSE:To realize decreased wiring distance of power supply lines on a board by an SHF converter and also separated layout between power supply lines and signal lines. CONSTITUTION:A metal-made shield wall 4 is set upright almost in the middle in a casing 1, a throughhole 5a penetrating through the shield wall 4 is made and the shield wall 4 is neatly fitted to the throughhole 5a by putting the board 5 to be fallen into the casing 1. Furthermore, a low noise amplifier section LNA, a frequency mixer section MIX (including a local oscillation section OSC), an intermediate frequency amplifier section IFA and a power supply section POWER are arranged on the board 5 in this order in a line as a ring to surround the shield wall 4. Thus, the power supply section is arranged between the low noise amplifier section and the intermediate frequency amplifier section and a power supply line 201 leading to the low noise amplifier section and a power supply line 202 leading to the intermediate frequency amplifier section, the frequency mixer section and the local oscillation section are provided independently respectively on the board 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency converter used for receiving SHF broadcasting.

[0002]

2. Description of the Related Art A SHF converter (microwave outdoor unit) is used as an additional device for a satellite broadcast receiver. As shown in FIG. 7, the SHF converter includes a low noise amplification unit LNA, a frequency mixing unit MIX, a local oscillation unit OSC,
A main circuit unit is composed of the intermediate frequency amplifier IFA and the power supply unit POWER. Conventionally, the unit that constitutes such an SHF converter is mainly divided into circuit blocks or composed of a plurality of substrates whose materials are selected according to the signal frequency handled for each circuit block.

By the way, recently, in order to reduce the size of the SHF converter and to simplify the assembling, a single substrate is being promoted, and examples thereof include those shown in FIGS. 8 and 9. For example, in FIG. 8, a shield wall 82 is provided in a housing 81 so that an independent shield system can be secured for each circuit block, and a substrate 83 is processed according to a planar shape partitioned by the shield wall 82. It is a thing. Further, one surface of the housing 81 is covered with a cover (not shown), and the back surface of the cover comes into contact with the tip end surface of the shield wall 82 so that a shield system for each circuit block is configured. There is. Further, FIG. 9 shows the local oscillator OSC.
And each circuit block of the frequency mixing unit MIX on the substrate 93.
It is covered with a shield cover 94 above, and the low noise amplifier LN is placed at a position on the substrate 93 with the shield cover 94 interposed therebetween.
A, the intermediate frequency amplifier IFA, and the power source POWER are arranged respectively.

Next, problems in the conventional technique will be described by taking these conventional single-substrate SHF converters as an example.

84 and 95 in FIGS. 8 and 9.
Is an input probe for inputting a signal (RF signal) received by an antenna unit (not shown), and signal paths 401 and 501 indicated by dotted arrows in the figure are input probes 84,
Low noise amplification section LNA and frequency mixing section M starting from 95
IX (including the local oscillator OSC), the intermediate frequency amplifier IFA, and the output connectors 85 and 96 are traced in this order. Then, the output signals of the SHF converter are sent from the output connectors 85 and 96 to the tuner through the IF cable. On the other hand, I
The power supply voltage sent from the tuner through the F cable is supplied to the power supply unit POWER through the power supply connector, converted into a constant voltage or a negative voltage by the power supply unit POWER, and then indicated by a solid line arrow in the figure. Routes 402, 5
02 is supplied to each circuit block.

Therefore, inevitably, the power supply section POWER
Will be arranged near the connector and the intermediate frequency amplification unit IFA, which causes a problem that the power supply line from the power supply unit POWER to each circuit block becomes long. In addition, since the power supply line is laid out along the signal line, electrical connection between the power supply line and the signal line is likely to occur and the operation reliability is deteriorated.

[0007]

As described above, the conventional SH
In the F converter, the power supply unit is arranged near the intermediate frequency amplification unit which is a circuit block located at the end of the signal path, and as a result, the total length of the power supply line from the power supply unit to each circuit block is long. Will be. Further, since the power supply line is laid out along the signal line, electrical connection between the power supply line and the signal line is likely to occur, and there is a problem that operational reliability deteriorates.

The present invention is intended to solve such a problem, and an object thereof is to provide a high-frequency converter capable of shortening the routing distance of the power supply line and separating the layout of the power supply line and the signal line. There is.

[0009]

In order to achieve the above-mentioned object, the high frequency converter of the present invention comprises an amplifying section, a frequency mixing section, a local oscillating section, an intermediate frequency amplifying section and a power supply section on a single substrate. In the high-frequency converter provided, a metal shielding wall is erected at a position corresponding to substantially the center of the substrate,
The amplification unit, the frequency mixing unit including the local oscillation unit, the intermediate frequency amplification unit, and the power supply unit are arranged in a line on the substrate so as to surround the shielding wall.

[0010]

According to the present invention, the power supply unit can be arranged between the amplification unit and the intermediate frequency amplification unit, and the power supply line from the power supply unit to the amplification unit, the intermediate frequency amplification unit,
It becomes possible to independently provide power supply lines to the frequency mixing unit and the local oscillation unit on the substrate. Therefore, the total routing distance of the power supply line can be significantly shortened.

[0011]

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

FIG. 1 is an exploded perspective view showing the structure of an SHF converter according to an embodiment of the present invention.

In the figure, reference numeral 1 is a metal housing.
This housing has a rectangular parallelepiped shape with one side open. Case 1
The open surface of is covered with a metal shield cover 2,
As a result, the inside of the housing 1 is sealed with the shield structure. The shield cover 2 is fixed to the housing 1 by a plurality of setscrews 3. In addition, a metal shield wall 4 is provided upright in a substantially central portion of the housing 1. The tip surface of the shield wall 4 is in contact with the back surface of the shield cover 2.

Reference numeral 5 is a substrate housed in the housing 1. The outer shape of the substrate 5 is matched with the planar shape inside the housing 1. A through hole 5a for inserting the shield wall 4 is formed at a substantially central portion of the substrate 5. That is, by dropping the substrate 5 into the housing 1, the through hole 5
The configuration is such that the shield wall 4 fits exactly in a.
The board 5 is fixed in the housing 1 by a plurality of setscrews 6.

On the substrate 5, a low noise amplifier LNA, a frequency mixer MIX (including a local oscillator OSC), an intermediate frequency amplifier IFA, and a power supply POWER are provided as circuit block groups constituting the SHF converter. They are arranged in a line so as to surround the shield wall 4 and arranged in the order described above. Here, the frequency mixing unit MIX and the local oscillating unit OSC are arranged in the same region on the substrate 5 as one circuit block.

Reference numeral 7 is an input probe for inputting an RF signal received by an antenna unit (not shown). A signal path 100 indicated by a dotted arrow in the figure starts from this input probe 7 as a low noise amplification section LNA and frequency mixing section MIX.
(Including local oscillator OSC) and local oscillator OS
The order of C, intermediate frequency amplifier IFA, and output connector 8 is followed. Further, as the power supply line, as indicated by a solid arrow in the figure, the power supply unit is connected to the low noise amplification unit LNA.
To the intermediate frequency amplifier IFA, the frequency mixer MIX, and the local oscillator OSC from the power supply unit POWER.

Further, the width of each circuit block on the substrate 5, that is, the distance W between the shield wall 4 and the inner wall of the housing 1 is the maximum of the signals which flow in each circuit block and which are desired to prevent the propagation of space. The dimensions are set so that the signal of the frequency is cut off.

For example, the frequency of the maximum frequency signal is fh
, And the wavelength is λh, the width W of the circuit block is W <
Set so that the relationship of λh / 2 is satisfied. That is,
In the low noise amplifier LNA, the frequency fRF (wavelength λRF) of the input signal (RF signal) and the local oscillation frequency fLO (wavelength λ)
If the relationship with LO) is fRF> fLO, then WLNA <fRF / 2 and set so that signals below fRF are cut off. When fRF <fLO, WLNA <fLO / 2. When fRF <fLO, the image signal (frequency f
image, wavelength λ image) is the highest frequency signal. Therefore, when it is necessary to prevent the propagation of the image signal in the space, set WLNA <fimage / 2. The width WIFA of the intermediate frequency amplification unit IFA is determined by the frequency fIF (wavelength λIF) of the output signal (IF signal) and the local oscillation frequency fLO.
Since the relationship with (wavelength λLO) is fIF <fLO, WIFA <fLO / 2 is set to suppress leakage of the output signal to the oscillation signal of the local oscillator OSC. FIG. 1 shows this case. In addition, the width of the frequency mixing unit MIX (including the local oscillation unit OSC) is similarly set,
In this case, it is necessary to consider the balance with the resonance system of the local oscillator OSC.

Thus, according to the SHF converter of this embodiment, the power supply section POWER can be arranged between the low noise amplification section LNA and the intermediate frequency amplification section IFA. Therefore, the power supply line 201 to the low noise amplifier LNA, the intermediate frequency amplifier IFA, the frequency mixer MIX, and the local oscillator OS.
The power supply lines 202 to C can be independently provided on the substrate 5, and the total routing distance of the power supply lines can be greatly shortened. Along with this, it is possible to significantly reduce the portion where the power supply line and the signal line overlap in parallel, and it is possible to suppress electrical coupling between the power supply line and the signal line.

Further, according to the SHF converter of the present embodiment, the width of each circuit block is in the cutoff state with respect to the signal of the maximum frequency among the signals flowing in each circuit block for which the propagation of the space is desired to be blocked. And the power supply unit POWER is connected to the low noise amplification unit LN.
Since it can be arranged between A and the intermediate frequency amplification unit IFA, input / output separation, that is, electrical coupling between the low noise amplification unit LNA and the intermediate frequency amplification unit IFA can be effectively suppressed, and operation reliability is further improved. Can be made.

Further, according to this embodiment, the shape of the substrate 5 can be simple and the shield structure can be simplified.
A mechanically stable product can be obtained.

Next, another embodiment of the present invention will be described.

FIG. 2 is an exploded perspective view of the configuration of the SHF converter of this embodiment. In the SHF converter of this embodiment, the planar shape of the substrate 15 is a donut shape, and the shield wall 14 provided on the housing 11 is connected to the through hole 1 of the substrate 15.
It is formed in a cylindrical shape in accordance with the shape of 5a. As a matter of course, the internal shape of the housing 11 that houses the substrate 15 is also the substrate 1
The shape is adapted to the outer shape of No. 5. In addition, regarding the arrangement of each circuit block and the power supply line on the board 15,
Basically, it is the same as the previous embodiment.

FIG. 3 is an exploded perspective view showing the structure of the SHF converter of still another embodiment. As shown in the figure, in this embodiment, the local oscillator O is provided at the center of the substrate 25.
SC is arranged. A through hole 25a is formed in the substrate 25 in a planar shape so as to surround the region where the local oscillator OSC is arranged except for a part thereof. The shield wall 24 inserted through the through hole 25a partially oscillates the local oscillation unit OSC, that is, a power supply line lead-in portion from the power supply unit POWER to the local oscillation unit OSC and oscillation from the local oscillation unit OSC to the frequency mixing unit MIX. It has a structure in which it is surrounded except the frequency supply part. Further, on the substrate 25, the low noise amplification section LNA, the frequency mixing section MIX, the intermediate frequency amplification section IFA, and the power supply section POWER are arranged in a line in a ring shape so as to surround the shield wall 24 and arranged in the order described above. It is set up. In the case of this embodiment,
A power supply line 301 from the power supply unit POWER to the low noise amplification unit LNA, a power supply line 302 to the local oscillation unit OSC, a power supply line 303 to the intermediate frequency amplification unit IFA and the frequency mixing unit MIX are independently provided on the substrate 25. It is possible to further shorten the total routing distance of the power supply line. In addition, electrical coupling between the power supply line and the signal line can be suppressed more effectively.

Next, another embodiment relating to the shield wall will be described.

In each of the embodiments described above, the shield wall is formed integrally with the housing, but as shown in FIG.
A metallic shield plate 36 may be soldered on top. In addition, as shown in FIG. 5, a metal shield block 46
May be fixed to the housing 41 together with the substrate 45 with a set screw 47.

Further, in the embodiment of FIG. 1, the width WIFA of the intermediate frequency amplifier IFA is set to WIFA <fLO / 2 so as to suppress mixing of the output signal with the oscillation signal of the local oscillator OSC. For the purpose of stabilizing the operation of the intermediate frequency amplifier IFA, as shown in FIG. 6, WIFA <f
It may be set to IF / 2.

[0028]

As described above, according to the high frequency converter of the present invention, the power supply section can be disposed between the amplification section and the intermediate frequency amplification section, and the power supply line from the power supply section to the amplification section can be provided. The power supply lines to the intermediate frequency amplification unit, the frequency mixing unit and the local oscillation unit can be independently provided on the substrate. Therefore, the total routing distance of the power supply line can be significantly shortened. Along with this, it is possible to significantly reduce the portion where the power supply line and the signal line overlap in parallel, and it is possible to suppress electrical coupling between the power supply line and the signal line.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a configuration of an SHF converter according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a configuration of an SHF converter of another embodiment.

FIG. 3 is an exploded perspective view showing a configuration of an SHF converter of still another embodiment.

FIG. 4 is a perspective view showing a modified example of a shield wall.

FIG. 5 is a perspective view showing another modification of the shield wall.

FIG. 6 is a diagram showing an example in which the width of the intermediate frequency amplification unit IFA on the substrate is changed.

FIG. 7 is a block diagram showing a circuit configuration of an SHF converter.

FIG. 8 is a plan view showing the structure of a conventional SHF converter.

FIG. 9 is a plan view showing the structure of another conventional SHF converter.

[Explanation of symbols]

1 ... Housing, 2 ... Shield cover, 4 ... Shield wall, 5 ...
Substrate, 5a ... Through hole, LNA ... Low noise amplifier, MIX ...
Frequency mixing section, OSC ... local oscillating section, IFA ... intermediate frequency amplifying section, POWER ... power supply section.

Claims (9)

[Claims] 1. An amplifying section, a frequency mixing section, and a single substrate on a single substrate.
In a high frequency converter provided with a local oscillator, an intermediate frequency amplifier and a power supply, a shield wall is erected at a position corresponding to substantially the center of the substrate, and the amplifier is provided on the substrate so as to surround the shield wall. Section, the frequency mixing section including the local oscillating section, the intermediate frequency amplifying section, and the power supply section are arranged side by side in a row. 2. An amplifying unit, a frequency mixing unit, and a single substrate on a single substrate.
In a high frequency converter provided with a local oscillator, an intermediate frequency amplifier, and a power supply, the local oscillator is arranged at a substantially central portion on the substrate, and a shielding wall is vertically arranged so as to surround the local oscillator. A high-frequency conversion device, wherein the amplification unit, the frequency mixing unit, the intermediate frequency amplification unit, and the power supply unit are arranged in a line on the substrate so as to surround the shielding wall. 3. An amplifying section, a frequency mixing section, and a single substrate on a single substrate.
A high-frequency conversion device in which a local oscillator, an intermediate frequency amplifier, and a power supply are provided, and the substrate is housed in a metal casing, wherein a through hole is formed in a substantially central portion of the substrate and the casing is formed. A shielding wall is erected so as to penetrate the through hole, and the frequency mixing unit including the amplification unit and the local oscillation unit on the substrate so as to surround the shielding wall, the intermediate frequency amplification unit. And a high-frequency converter characterized in that the power supply units are arranged in a line. 4. The high frequency conversion device according to claim 1, wherein the power supply unit is arranged between the amplification unit and the intermediate frequency amplification unit. 5. The high frequency conversion device according to claim 3, wherein at least the amplification unit of the substrate, the frequency mixing unit,
The width of the local oscillation unit and the intermediate frequency amplification unit in the direction orthogonal to the shielding effective wall surface of the shielding wall is cut off from a signal having a specific frequency selected from the signals flowing through the respective units. A high-frequency converter characterized in that the dimensions are respectively set to 6. The high frequency conversion device according to claim 5, wherein the signal of the specific frequency is a signal of the maximum frequency among signals that should prevent propagation of space. . 7. An amplifying unit, a frequency mixing unit, and a single substrate on a single substrate.
In a high-frequency conversion device provided with each circuit of a local oscillation unit, an intermediate frequency amplification unit, and a power supply unit, in each of the circuits, a circuit receiving power supply from the power supply unit is arranged adjacent to the power supply unit. A high-frequency converter characterized in that 8. The high-frequency conversion device according to claim 7, wherein among the circuits, the local oscillator is arranged adjacent to other circuits with a shielding wall interposed. . 9. An amplifier section, a frequency mixing section, and a single substrate on a single substrate.
In a high-frequency conversion device provided with each circuit of a local oscillator, an intermediate frequency amplifier, and a power supply, a shield wall is erected at a position corresponding to substantially the central part of the substrate, and a signal is provided along substantially the half circumference of the shield wall. A high-frequency conversion device characterized in that a line is provided and a power supply path is provided along a half peripheral portion different from the substantially half peripheral portion of the shielding wall.