JP2000162259A - Apparatus for measuring-high frequency components - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sequentially measure characteristics of a high-frequency components to which a DC voltage is supplied by switching a voltage of a DC power source, without switching a high-frequency signal for select the component to be measured. SOLUTION: A plurality of high-frequency components are connected in parallel with one measuring instrument. A measured, high-frequency signal is simultaneously applied to the components. Output of the components are connected to measurement signal input terminals of the instrument, only DC voltage supplied to the components are sequentially switched and supplied, and characteristics of the components to which the DC voltages are supplied are sequentially measured. Since only AGC voltage is switched, without switching the high frequency signals in this apparatus for measuring, only the AGC voltage of the DC voltage may be switched to switch the components 1, 2,..., N to be measured needs to be switched. Accordingly, the signals to be switches are reduce to only one DC signal to obtain a simple constitution. Furthermore, a complicated expensive device for switching the high frequency signals is eliminated to reduce the cost and to improve reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring device for measuring characteristics of high frequency components such as a television tuner. A high-frequency component measuring apparatus according to the present invention performs measurement of a plurality of high-frequency components without switching high-frequency signals.

[0002]

2. Description of the Related Art Conventional high-frequency components such as tuners are individually measured for their characteristics, and only those having predetermined characteristics are shipped as products. As an apparatus for measuring the characteristics of such a high-frequency component, an apparatus having a configuration shown in FIG. 2 is known. In FIG. 2, 1, 2,
.. N are high-frequency components such as tuners for which high-frequency characteristics are measured. Reference numeral 10 denotes a measuring instrument for measuring characteristics of the high-frequency component, and reference numeral 20 denotes a DC power supply for supplying a DC voltage to the high-frequency component. SH is a high frequency signal changeover switch.

A measuring instrument 10 has an output terminal 11 for a high-frequency signal for measurement and a measurement signal input terminal 12, and detects a signal output when the high-frequency signal for measurement is added to a measurement target at the measurement signal input terminal. To measure the characteristics of the object to be measured. DC power supply 20 is connected to voltage terminals 21 and 22 and AGC (Auto
Gain Control (hereinafter abbreviated as ACC) has a voltage terminal 23 and supplies various voltages for operating the measurement target. The output terminal 11 of the measuring device 10 for the high frequency signal for measurement is connected to the high frequency components 1, 2,... N via the high frequency signal changeover switch SH. The output terminals of the high-frequency components 1, 2,... N are connected to a measurement signal input terminal 1 of the measuring instrument 10 via a high-frequency signal changeover switch SH.
2 are connected. Voltage terminals 21 and 2 of DC power supply 20
2 and the AGC voltage terminal 23 are high-frequency components 1, 2,.
N.

In the high frequency component measuring apparatus having such a configuration, the DC voltage of the voltage terminals 21 and 22 and the AGC voltage of the AGC voltage terminal 23 are supplied to the high frequency components 1, 2,. And put it in operation. In such a state, a high-frequency signal of 50 MHz to 900 MHz for measurement is transmitted from the measuring device 10 via the high frequency signal changeover switch SH to the high frequency components 1, 2,.
..30 MHz to 60 MH outputted from a high-frequency component outputted when a high-frequency signal is added sequentially to N
The characteristics of the high-frequency components 1, 2,... N are sequentially measured by adding the intermediate frequency signal of z to the measurement signal input terminal 12 of the measuring device 10 via the high-frequency changeover switch SH and measuring. ing.

[0005] 50M for measurement supplied from the measuring instrument 10
The switching of the high frequency signal of Hz to 900 MHz is automatically performed under the control of the computer, and the high frequency components 1, 2,...
A general tuner can obtain an intermediate frequency output signal by adding a high frequency input signal, various DC operating voltages, and an AGC voltage variable DC voltage. And
By changing the AGC voltage applied to the high frequency components 1, 2,... N, it is possible to change the level of the output signal of the high frequency components. In a conventional measuring apparatus as shown in FIG. 2, in order to switch a high-frequency signal to a plurality of devices under test, a special high-frequency signal changeover switch SH capable of performing high-speed switching operation with stable frequency characteristics is used. The signal is being switched.

[0006]

The conventional automatic measuring device for high frequency components has the following problems. 1. Changeover switch SH for switching high frequency signals
In addition, complicated and high-performance ones are required and expensive. 2. The device SH for switching high-frequency signals often breaks down when used for a long time, and lacks reliability. An object of the present invention is to provide a measuring device for a high-frequency component which solves the above problems.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a measuring apparatus for measuring the characteristics of a plurality of high-frequency components, wherein a plurality of high-frequency components are connected in parallel to one measuring instrument, and are simultaneously connected to the plurality of high-frequency components. While applying a high frequency signal for measurement,
The output and output terminals of a plurality of high-frequency components are connected in parallel to the measurement signal input terminal of the measuring instrument, and only the DC voltage supplied to the high-frequency components is sequentially switched to supply the characteristics of the high-frequency components supplied with the DC voltage in sequence. This realizes a measuring device for high-frequency components to be measured. In the measuring device for high-frequency components of the present invention, only the DC voltage is switched without switching the high-frequency signal. Therefore, since the switching target is the DC voltage, the configuration of the switch is simplified, and the switching of the high-frequency signal is complicated and expensive. Since the device is not required, the cost is reduced and the reliability of the measuring device can be improved.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 is a block diagram of an embodiment of a high frequency component measuring apparatus according to the present invention. In FIG. 1, 1, 2,.
N is a high-frequency component such as a tuner for measuring high-frequency characteristics. Reference numeral 10 denotes a measuring instrument for measuring the characteristics of the high-frequency component, and MX1 and MX2 denote mixers for high-frequency signals. 2
Reference numeral 0 denotes a DC power supply that supplies a DC voltage to the high-frequency components 1, 2,. SD is a DC signal changeover switch. The measuring device 10 has an output terminal 1 for a high-frequency signal for measurement.
1 and a measurement signal input terminal 12, a signal output when a high-frequency signal for measurement is added to the measurement target is detected by the measurement signal input terminal, and the characteristics of the measurement target are measured. The DC power supply 20 has voltage terminals 21 and 22 and an AGC voltage terminal 23 and supplies various voltages for operating the measurement target.

The output terminal 11 of the measuring high-frequency signal of the measuring device 10 is connected to the high-frequency components 1, 2,.
N is connected in parallel. High frequency components 1, 2, ...
The output terminal of N is connected in parallel to the measurement signal input terminal 12 of the measuring device 10 via the mixer MX2. The DC voltage output terminals 21 and 22 of the DC power supply 20
2,... N. Also, A of the DC power supply 20
The GC voltage terminal 23 is connected to the AGC voltage terminal input terminals of the high frequency components 1, 2,... N via a DC signal changeover switch SD.

The operation of the high frequency component measuring apparatus of the present invention thus configured is performed as follows. The outline of the tuner assumed as the high frequency components 1, 2,... N is as follows. The voltages required for the operation of the tuner are three types of DC voltages of 5V, 9V and 30V.
In addition to these DC voltages, an AGC voltage for setting the level of the output signal of the tuner is used. AG on tuner
If the C voltage is not applied, no operation is performed even if the power supply voltage is applied. For this reason, the level of the output signal of the tuner to which the AGC voltage is supplied increases, and the other A
Since the GC voltage is supplied and the tuner is not operating, the output signal is almost at the 0 level.

A high-frequency signal for measurement is previously applied to each of the high-frequency components 1, 2,... N from the measuring device 10 via the mixer MX1. In a high-frequency component such as a tuner for which high-frequency characteristics are measured, even if a normal power supply voltage is applied, an operation state is not established unless an AGC voltage is applied. In this state, each of the high-frequency components 1, 2,.
N is not in operation. In such a state,
.. N are sequentially applied from the DC power supply 20 to the high frequency components 1, 2,... N via a DC signal changeover switch SD, and the high frequency components 1, 2,. The AGC voltage of the DC power supply 20 is sequentially switched and supplied to the high-frequency components to be measured using an existing switch control unit.

For this reason, the output signal level is high only in the high-frequency components to which the voltage of the DC power supply 20 is supplied, and the other high-frequency components are almost inactive because the other high-frequency components are not operating. In this way, it becomes possible to switch the high-frequency component to be measured by supplying the AGC voltage of the DC power supply 20. The signals of the high-frequency components 1, 2,... N output when the AGC voltage of the DC power supply 20 is applied are applied to the measurement signal input terminal 12 of the measurement device 10 via the mixer MX2 and measured. . In this manner, the DC power supply 20 is selectively and sequentially applied to the high-frequency components 1, 2,.
By applying more AGC voltage, high frequency components 1, 2, 2,
... N characteristics can be measured. In this case, by setting the control of the changeover switch SD of the AGC voltage supplied from the DC power supply 20 in advance so as to be automatically performed by a computer program or the like, the high frequency components 1, 2,. Automatic measurement is possible.

In the high frequency component measuring apparatus of the present invention, only the AGC voltage is switched without switching the high frequency signal. Therefore, the high frequency components 1, 2,.
Since only the AGC voltage of the DC voltage needs to be switched in order to switch N, the configuration is simplified because the number of signals to be switched is reduced to only one DC signal. Further, since a complicated and expensive switching device for high-frequency signals is not required unlike the conventional device, the cost is reduced and the reliability is improved. The high-frequency components to be measured by the high-frequency component measuring device of the present invention are not limited to the tuners shown in the above embodiments, but may be various types of high-frequency components that handle high-frequency signals operated by a DC power supply. Can be applied. In this case, if the high-frequency component to be measured is a component having no AGC voltage terminal, the power supply voltage supplied to the component may be directly switched.

[0014]

As described above, the high-frequency component measuring apparatus of the present invention has a plurality of high-frequency components connected in parallel to one measuring instrument, and a high-frequency signal for measurement is simultaneously applied to the plurality of high-frequency components. In addition, the output and output terminals of the plurality of high-frequency components are connected in parallel to the measurement signal input terminals of the measuring instrument, and only the DC voltage supplied to the high-frequency components is sequentially switched and supplied. The characteristics are sequentially measured.

In the present invention, since the high-frequency component to be measured is selected by switching the voltage of the DC power supply without switching the high-frequency signal, the following effects can be realized. 1. Since only the DC voltage needs to be switched to switch the high-frequency components, the number of signals to be switched is reduced, and the configuration is simplified. 2. Since a complicated and expensive high-frequency signal changeover switch is not required, cost is reduced and reliability is improved. 3. The configuration of the changeover switch and the control program are simplified. 4. Since the device can be constructed using an inexpensive and simple changeover switch, the device can be made by itself. 5. Since the configuration of the changeover switch is simplified, unstable materials when the device is used for many years are eliminated, and long-term reliability is increased.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of a measuring device for high frequency components of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional high-frequency component measuring device.

[Explanation of symbols]

1, 2,... N: high-frequency components such as tuners for measuring high-frequency characteristics, 10: measuring device for measuring characteristics of high-frequency components, 11: measuring device 10
Output terminal of high-frequency signal of the measuring device 12
, Measurement signal input terminals, MX1, MX2... High-frequency signal mixer, 20.
... DC power supply for supplying DC voltage to N, 21,
22 ... voltage terminal of DC power supply 20, 23 ...
AGC voltage terminal of DC power supply 20, SD: DC signal changeover switch, SH: High frequency signal changeover switch

Claims (5)

[Claims] 1. A measuring apparatus for measuring characteristics of a plurality of high-frequency components, wherein a plurality of high-frequency components are connected in parallel to one measuring instrument, and a high-frequency signal for measurement is applied to the plurality of high-frequency components simultaneously. In addition, the output of a plurality of high-frequency components is connected in parallel to the measurement signal input terminal of the measuring instrument, and only the DC voltage supplied to the high-frequency components is sequentially switched and supplied, so that the characteristics of the high-frequency components supplied with the DC voltage are changed. A measuring device for high-frequency components that is measured sequentially. 2. A measuring apparatus for measuring characteristics of a plurality of high-frequency components, wherein a plurality of high-frequency components are connected to one measuring device in parallel via a mixer, and the mixer is connected to the plurality of high-frequency components. High-frequency signals for measurement at the same time, and the outputs of a plurality of high-frequency components are connected in parallel to the measurement signal input terminals of the measuring device via a mixer, and only the DC voltage supplied to the high-frequency components is sequentially switched. A high-frequency component measuring device configured to sequentially measure characteristics of a high-frequency component to which a DC voltage has been supplied. 3. An apparatus according to claim 1, wherein said plurality of high-frequency components are tuners. 4. The AGC (Auto Gain Control) according to claim 1, wherein the DC power supply for supplying the high-frequency component is capable of outputting a variable DC voltage.
A high-frequency component measuring device having a voltage source and sequentially switching and supplying only the voltage of an AGC voltage source to be supplied to the high-frequency component. 5. A high-frequency component measuring apparatus according to claim 1, wherein a DC voltage supplied to the high-frequency component is automatically switched by a program.