JP2008058326A - Error factor determination device, method, program, output correction apparatus provided with recording medium and the device, and reflection coefficient measuring apparatus - Google Patents

Error factor determination device, method, program, output correction apparatus provided with recording medium and the device, and reflection coefficient measuring apparatus Download PDF

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JP2008058326A
JP2008058326A JP2007273532A JP2007273532A JP2008058326A JP 2008058326 A JP2008058326 A JP 2008058326A JP 2007273532 A JP2007273532 A JP 2007273532A JP 2007273532 A JP2007273532 A JP 2007273532A JP 2008058326 A JP2008058326 A JP 2008058326A
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error factor
signal
reflection coefficient
output terminal
error
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Masahito Haruta
Kiwa Nakayama
Hiroyuki Sekine
喜和 中山
将人 春田
浩幸 関根
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Advantest Corp
株式会社アドバンテスト
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Abstract

<P>PROBLEM TO BE SOLVED: To easily calibrate a signal generating system such as a switch branch signal source. <P>SOLUTION: An error factor determination device 20 is provided with an error factor recording part for recording error factors Eija in the signal generating system 100 having both a signal generating part 12 for generating signals and an output terminal 19a for outputting signals; a reflection coefficient deriving part 24 for deriving a reflection coefficient of the output terminal 19a on the basis of measurement results R1 and R2 of signals in a state in which the output terminal 19a is outputting signals and the error factors Eija recorded in the error factor recording part; and a validity determination part for determining the validity of the recorded error factors Eija on the basis of a derived reflection coefficient Xm and a true value of a reflection coefficient. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to calibration of a switch branch signal source that combines a signal source that generates a signal and a switch that outputs the generated signal to one of a plurality of ports.

Conventionally, the device under test (DUT: Device
Under Test) circuit parameters (for example, S parameters) are measured (for example, see Patent Document 1).

  Specifically, the signal is transmitted from the signal source to the receiving unit via the DUT. This signal is received by the receiving unit. By measuring the signal received by the receiving unit, the S-parameters and frequency characteristics of the DUT can be acquired.

  At this time, a measurement system error occurs in measurement due to a mismatch between the measurement system such as the signal source and the DUT. This measurement system error is, for example, Ed: an error caused by the directionality of the bridge, Er: an error caused by frequency tracking, and Es: an error caused by source matching.

  In this case, the error can be corrected as described in Patent Document 1, for example. Such correction is called calibration. Outline of calibration. A calibration kit is connected to the signal source to realize three types of states: open (open), short (short-circuit), and load (standard load Z0). The signal reflected from the calibration kit at this time is acquired by a bridge, and three types of S parameters corresponding to the three types of states are obtained. Three types of variables Ed, Er, and Es are obtained from the three types of S parameters, and correction is performed.

  Note that Er is expressed as a product of an error Er1 related to signal input and an error Er2 related to signal reflection. Here, Er1 and Er2 can be measured by connecting a power meter to the signal source and measuring the power (see, for example, Patent Document 2).

  Such calibration can be applied to a switch branch signal source. The switch branch signal source is a combination of a signal source that generates a signal and a switch that outputs the generated signal to one of a plurality of ports. When this type of calibration is applied to a switch branch signal source, each of the multiple ports can realize three types of states: open (open), short (short-circuit), and load (standard load Z0). If there is, a power meter will be connected.

  Here, if the measurement of Ed, Er1, Er2, and Es is performed every time the circuit parameter of the device under test is measured, it is complicated. Therefore, Ed, Er1, Er2, and Es measured at a certain time are recorded, and correction is performed using the recorded Ed, Er1, Er2, and Es each time the circuit parameter of the device under test is measured. Is desired.

Japanese Patent Laid-Open No. 11-38054 International Publication No. 2004/049564 Pamphlet

  However, there is a possibility that the measurement system changes with time and fails between the time when Ed, Er1, Er2, and Es are measured until the time when the circuit parameter of the device under test is measured. Ed, Er1, Er2, and Es may change from the time of measurement due to changes in the measurement system over time and failures. In this case, even if correction is performed using the recorded Ed, Er1, Er2, and Es, accurate correction cannot be performed.

  Whether Ed, Er1, Er2, and Es have changed from the time of measurement when the circuit parameters of the device under test are measured can be determined by actually measuring Ed, Er1, Er2, and Es. However, in this case, the complexity of actually measuring Ed, Er1, Er2, and Es cannot be avoided.

  Accordingly, an object of the present invention is to easily perform calibration of a signal generation system such as a switch branch signal source.

  An error factor determination device according to the present invention includes an error factor recording unit that records an error factor in a signal generation system having a signal generation unit that generates a signal and an output terminal that outputs the signal, and the signal from the output terminal. The reflection coefficient for deriving the reflection coefficient of the output terminal in which the error due to the error factor is corrected based on the measurement result of the signal in the state where the error is output and the error factor recorded in the error factor recording means Derivation means, and true / false determination means for judging true / false of the recorded error factors based on the derived reflection coefficient and the true value of the reflection coefficient.

  According to the error factor determination apparatus configured as described above, the error factor recording unit records an error factor in a signal generation system having a signal generation unit that generates a signal and an output terminal that outputs the signal. The error due to the error factor is corrected based on the measurement result of the signal when the signal is output from the output terminal and the error factor recorded in the error factor recording unit. The reflection coefficient of the output terminal is derived. Based on the derived reflection coefficient and the true value of the reflection coefficient, a true / false determination unit determines whether the recorded error factor is true or false.

  In the error factor determination device according to the present invention, the measurement result of the signal may include a result of measuring the signal before the error factor occurs and a result of measuring the reflected signal. May be.

  In the error factor determination device according to the present invention, the signal is measured in a state where a calibration tool is connected to the output terminal, and the calibration tool is any one of an open circuit, a short circuit, a standard load, and an arbitrary load. This state may be realized.

  In the error factor determination device according to the present invention, the signal generation system includes an amplifier that amplifies the signal, and the error factor determination device records an amplification factor of the amplifier; An amplification factor deriving unit for deriving the amplification factor based on the measurement result of the signal in a state where the signal is output from the output terminal and the power of the signal, and the recorded amplification factor You may make it provide the amplification factor authenticity determination means which determines the truth of the recorded amplification factor based on the amplification factor.

  The error factor determination device according to the present invention is characterized in that the authenticity determination unit is configured to recommend the measurement of the error factor or report the failure of the signal generation system based on the recorded true / false determination result of the error factor. May be performed.

  An output correction device according to the present invention includes an error factor determination device according to the present invention, and a signal power adjustment unit that adjusts the power of the signal based on the error factor determined to be true by the authenticity determination unit. It is comprised so that it may comprise.

  The reflection coefficient measuring device according to the present invention includes an error factor determination device according to the present invention, a result of measuring the signal before the error factor is generated in a state in which a device under test is connected to the output terminal, Reflection coefficient measuring means for measuring the reflection coefficient of the object to be measured based on the result of measuring the reflected signal and the error factor determined to be true by the authenticity determination means. Configured.

  The present invention provides an error factor recording step for recording an error factor in a signal generation system having a signal generation unit for generating a signal and an output terminal for outputting the signal, and the state in which the signal is output from the output terminal A reflection coefficient deriving step for deriving a reflection coefficient of the output terminal in which an error due to the error factor is corrected based on the measurement result of the signal in the error factor and the error factor recorded by the error factor recording step; In addition, the error factor determination method includes a true / false determination step of determining true / false of the recorded error factor based on the reflection coefficient and a true value of the reflection coefficient.

  The present invention relates to an error factor recording process for recording an error factor in a signal generation system having a signal generation unit for generating a signal and an output terminal for outputting the signal, and a state in which the signal is output from the output terminal And a reflection coefficient deriving process for deriving a reflection coefficient of the output terminal in which an error due to the error factor is corrected based on the measurement result of the signal in the error factor and the error factor recorded by the error factor recording process. And a true / false determination process for determining whether the recorded error factor is true or false based on the reflection coefficient and the true value of the reflection coefficient.

  The present invention relates to an error factor recording process for recording an error factor in a signal generation system having a signal generation unit for generating a signal and an output terminal for outputting the signal, and a state in which the signal is output from the output terminal And a reflection coefficient deriving process for deriving a reflection coefficient of the output terminal in which an error due to the error factor is corrected based on the measurement result of the signal in the error factor and the error factor recorded by the error factor recording process. And a computer that records a program for causing a computer to execute a true / false determination process for determining whether the recorded error factor is true or false based on the reflection coefficient and a true value of the reflection coefficient. It is a recording medium.

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

First Embodiment FIG. 1 is a diagram illustrating a configuration of a signal generation system 100 according to a first embodiment. The signal generation system 100 includes a signal generation unit 12, an amplifier 13, bridges 14a and 14b, mixers 16a and 16b, and an output terminal 19a.

  The signal generation unit 12 generates a signal (for example, a high frequency signal). The amplifier (amplifier) 13 amplifies the signal generated by the signal generation unit 12.

  The bridge 14a receives the output of the amplifier 13 and branches it in two directions. The mixer 16a receives one of the outputs of the bridge 14a and multiplies it with a local signal having a predetermined local frequency. However, local signals are not shown. It can be said that the output of the mixer 16a is a result of measuring a signal before an error factor occurs in the signal generation system 100.

  The bridge 14b receives the other of the outputs of the bridge 14a and outputs it as it is. However, the signal reflected from the output side (referred to as “reflected signal”) is received and applied to the mixer 16b. The mixer 16b multiplies the reflected signal and the local signal. However, local signals are not shown. It can be said that the output of the mixer 16b is a result of measuring the reflected signal. Since the reflected signal is a signal reflected from the output side, it can be said that the measurement result of the reflected signal is the measurement result of the signal.

  A signal is output from the output terminal 19a. Here, the S parameter of the output of the output terminal 19a is a1, and the S parameter of the output reflected by the output terminal 19a is b1.

  FIG. 2 is a signal flow graph of the signal generation system 100 according to the first embodiment.

  In FIG. 2, the output of the signal generator 12 is denoted as SG, the output of the mixer 16a is denoted as R1, and the output of the mixer 16b is denoted as R2. As shown in FIG. 2, R1 = SG × L, where L (S parameter) is the amplification factor of the amplifier 13.

  Referring to FIG. 2, it can be seen that error factors E11a, E12a, E21a, and E22a (S parameters) are generated in the signal generation system 100.

  FIG. 3 is a functional block diagram showing the configuration of the error factor determination device 20 according to the first embodiment. The error factor determination device 20 includes terminals 21a and 21b, an error factor recording unit 22, an amplification factor deriving unit 23, a reflection coefficient deriving unit 24, an amplification factor recording unit 25, a true value input unit 26, a true / false determination unit 28, and an amplification factor. A true / false determination unit 29 is provided.

  The terminal 21a is a terminal connected to the mixer 16a of the signal generation system 100. The terminal 21b is a terminal connected to the mixer 16b of the signal generation system 100.

  The error factor recording unit 22 records error factors E11a, E12a, E21a, and E22a of the signal generation system 100. Here, the error factors E11a, E12a, E21a, and E22a are expressed as error factors Eija (where i = 1 or 2, j = 1 or 2).

  The amplification factor deriving unit 23 derives the amplification factor L as L = R1 / SG based on the signal measurement result R1 in a state where the signal is output from the output terminal 19a and the signal power SG. The value of the signal power SG is given to the amplification factor deriving unit 23 from the outside of the error factor determination device 20. Further, the signal measurement result R1 is provided to the amplification factor deriving unit 23 via the terminal 21a.

  The amplification factor recording unit 25 records the amplification factor of the amplifier 13.

  The true value input unit 26 inputs the true value Xt of the reflection coefficient of the output terminal 19a. It is assumed that the true value Xt of the reflection coefficient of the output terminal 19a is already known before the signal measurement.

  The authenticity determination unit 28 determines the authenticity of the error factor Eija recorded in the error factor recording unit 22 based on the reflection coefficient Xm derived by the reflection coefficient deriving unit 24 and the true value Xt of the reflection coefficient. Specifically, when Xm and Xt match, it is determined that the error factor Eija is true. When determining that the error factor Eija is false, the true / false determination unit 28 recommends measurement of the error factor Eija or reports a failure of the signal generation system 100. For example, even if it is determined that the error factor Eija is false, if the difference between Xm and Xt is within a predetermined range, it is determined that the signal generation system 100 has changed over time, and the measurement of the error factor Eija is recommended. . Further, for example, when it is determined that the error factor Eija is false and the difference between Xm and Xt exceeds a predetermined range, it is determined that the signal generation system 100 is faulty, and a report to that effect is given. Do.

Note that the case where Xm and Xt match means the case where Xm = Xt. But Xm
Even if Xt is not Xt, Xm and Xt are considered to match if the difference between Xm and Xt is within an allowable range.

  The amplification factor authenticity determination unit 29 determines the authenticity of the recorded amplification factor based on the amplification factor recorded in the amplification factor recording unit 25 and the amplification factor derived by the amplification factor deriving unit 23. When the recorded amplification factor and the derived amplification factor match (equal), the amplification factor recorded in the amplification factor recording unit 25 is determined to be true. When determining that the recorded amplification factor is false, the amplification factor true / false determination unit 29 recommends measurement of the recorded amplification factor or reports a failure of the signal generation system 100. For example, even if it is determined that the recorded gain is false, if the difference between the two is within a predetermined range, it is determined that the signal generation system 100 has changed over time, and a recommendation for measuring the gain is made (or It is also possible to record the derived amplification factor in the amplification factor recording unit 25). For example, if it is determined that the recorded amplification factor is false and the difference between the two exceeds a predetermined range, it is determined that the signal generation system 100 is faulty and a report to that effect is made. .

  Even if the recorded gain is not equal to the derived gain, if the difference between the two is within an allowable range, the recorded gain matches the derived gain. I reckon.

  The reflection coefficient deriving unit 24 receives the signal measurement results R1 and R2 in a state where the signal is output from the output terminal 19a of the signal generation system 100 via the terminals 21a and 21b.

  With reference to FIG. 4, the outline of the measurement results received by the terminals 21a and 21b will be described. Referring to FIG. 4, when a signal is output from output terminal 19a and calibration tool 62 (open, short circuit, standard load and arbitrary load) is connected to output terminal 19a, terminals 21a and 21b are The measurement results of the signal (before the error factor Eija occurs) and the reflected signal (the signal reflected by the calibration tool 62) are received. In the example shown in FIG. 4, the calibration tool 62 is connected to the output terminal 19a, but it is conceivable that nothing is connected to the output terminal 19a (no connection state). Since the non-connection state is easier to realize than the case where the calibration tool 62 is connected, it is preferable that the non-connection state be a non-connection state. In the non-connected state, the phase change due to reflection is zero.

  The calibration tool 62 (short circuit) means that a short circuit state (reflection coefficient 1: total reflection) is realized. In this case, the phase change due to reflection is 180 degrees. The calibration tool 62 (standard load) means that the calibration tool 62 has a standard load that realizes a state having a reflection coefficient of zero. The calibration tool 62 (arbitrary load) means that the calibration tool 62 has an arbitrary load that does not allow impedance matching.

  Further, the reflection coefficient deriving unit 24 derives the reflection coefficient Xm of the output terminal 19a based on the signal measurement results R1 and R2 as described above and the error factor Eija recorded in the error factor recording unit 22.

  Next, the operation of the first embodiment will be described with reference to the flowcharts of FIGS. FIG. 22 is a flowchart showing the operation of the error factor determination device 20 according to the first embodiment. FIG. 23 is a flowchart showing the operation of the authenticity determination unit 28 of the error factor determination device 20 according to the first embodiment.

  First, the calibration tool 62 is attached to the output terminal 19a of the signal generation system 100 (S10). Further, the mixer 16 a of the signal generation system 100 is connected to the terminal 21 a of the error factor determination device 20, and the mixer 16 b of the signal generation system 100 is connected to the terminal 21 b of the error factor determination device 20.

  FIG. 4 is a diagram showing a state in which the calibration tool 62 is connected to the output terminal 19a, and the mixers 16a and 16b are connected to the terminals 21a and 21b. In FIG. 4, the components other than the terminals 21a and 21b and the reflection coefficient deriving unit 24 of the error factor determination device 20 are not shown. R1 is a measurement result of the signal before the error factor Eija occurs. R2 is the measurement result of the reflected signal. R1 and R2 are signal measurement results.

  However, the reflected signal is a signal (b1) obtained by reflecting the signal (a1) output from the output terminal 19a by the calibration tool 62. The signal (b1) reflected by the calibration tool 62 is given to the bridge 14b. The reflected signal given to the bridge 14b is given to the mixer 16b and multiplied with the local signal. The output of the mixer 16b is R2.

  A signal before the error factor Eija is generated is given to the bridge 14a. The signal supplied to the bridge 14a is supplied to the mixer 16a and multiplied with the local signal. The output of the mixer 16a is R1.

  In this way, R1 and R2 are measured (S12).

  The measured R1 and R2 are given to the reflection coefficient deriving unit 24.

  FIG. 5 is a signal flow graph representing the error factor determination device 20 in the state shown in FIG. In FIG. 5, the following formula (1) is established.

R2 / R1 = E11a + (E21a · E12a · X) / (1-E22a · X) (1)
Where X is a load coefficient of the calibration tool 62. The calibration tool 62 is a well-known one that realizes an open state, a short circuit, a standard load Z0, and an arbitrary load state (see, for example, Patent Document 1).

  When equation (1) is solved for X, the following equation (2) is obtained.

X = 1 / (E22a + ((E21a · E12a) / (R2 / R1-E11a)) (2)
The reflection coefficient deriving unit 24 substitutes the signal measurement results R1 and R2 into Expression (2). Further, the reflection coefficient deriving unit 24 reads out the error factor Eija recorded in the error factor recording unit 22 and substitutes it into the equation (2). Thereby, the reflection coefficient deriving unit 24 derives the load coefficient of the calibration tool 62, that is, the reflection coefficient X of the output terminal 19a (S14).

  The derived reflection coefficient X is Xm as described above. The derived reflection coefficient Xm should essentially match the true value Xt of the reflection coefficient X. If Xm and Xt do not match, the error factor Eija may be incorrect. That is, the error factor Eija recorded in the error factor recording unit 22 does not match the error factor Eija of the signal generation system 100 at the time of signal measurement. Such a phenomenon is considered to occur due to, for example, a change with time or a failure of the signal generation system 100.

  The derived reflection coefficient Xm is given to the authenticity determination unit 28. Further, the true value Xt of the reflection coefficient X of the output terminal 19 a is given to the true / false determination unit 28 via the true value input unit 26. The authenticity determination unit 28 compares the derived reflection coefficient Xm with the true value Xt (S16).

  The operation of the authenticity determination unit 28 will be described with reference to the flowchart of FIG.

  The authenticity determination unit 28 determines whether or not the derived reflection coefficient Xm matches the true value Xt of the reflection coefficient (S160). If Xm and Xt match (S160, Yes), it is determined that the error factor Eija recorded in the error factor recording unit 22 is true (S161).

  If Xm and Xt do not match (S160, No), it is determined that the error factor Eija recorded in the error factor recording unit 22 is false (S162).

  Here, even if Xm and Xt do not match, if the difference between Xm and Xt is within the predetermined range (S164, Yes), the true / false determination unit 28 determines that the signal generation system 100 has changed over time. The error factor Eija is recommended for measurement (S166). For example, a message (for example, “Please perform calibration”) recommending measurement of the error factor Eija is displayed on the display (not shown) of the error factor determination device 20.

  If Xm and Xt do not match and the difference between Xm and Xt is not within the predetermined range (S164, No), the authenticity determination unit 28 determines that the signal generation system 100 is faulty, A report to that effect is made (S168). For example, a message (for example, “the signal generation system has failed”) is displayed on the display (not shown) of the error factor determination device 20.

  An operation for determining the authenticity of the amplification factor of the amplifier 13 recorded in the amplification factor recording unit 25 will be described.

  The attachment of the calibration tool 62 (S10) and the measurement of R1 and R2 (S12) are the same as the above operations. Thereafter, the signal power SG and the measured R1 are supplied to the amplification factor deriving unit 23. The amplification factor deriving unit 23 derives the amplification factor L as L = R1 / SG. Then, the gain authenticity determination unit 29 determines the authenticity of the recorded gain based on the gain recorded in the gain recording unit 25 and the gain derived by the gain deriving unit 23. .

  According to the first embodiment, the calibration tool 62 having a known reflection coefficient is connected to the output terminal 19a, or nothing is connected to the output terminal 19a (no connection state) (however, the output terminal 19a in the no connection state) Measurement of R1 and R2 in a state in which the reflection coefficient is known) can determine whether the error factor Eija recorded in the error factor recording unit 22 is true or false.

  In other words, at the output terminal 19a, three types of states of open (open), short (short circuit), and load (standard load Z0) are realized, and a power meter is also connected without measuring the error factor Eija. Since it is possible to determine whether the error factor Eija recorded in the error factor recording unit 22 is true or false, it is easy to determine whether the error factor Eija is true or false.

  If it is determined that the error factor Eija is true, the error factor Eija recorded in the error factor recording unit 22 can be used as the error factor of the signal generation system 100. Since it is not necessary to measure the error factor Eija, the labor required for calibration can be reduced.

  If the error factor Eija is determined to be false, it may be necessary to measure the error factor of the signal generation system 100. However, since it is not necessary to measure the error factor every time the circuit parameter of the device under test is measured, the labor required for calibration can be reduced.

Second Embodiment The second embodiment relates to a switch branch signal source (signal generation system) 10 in which a signal source 110 and a plurality of output terminals 19a, 19b, 19c, and 19d are connected by a switch 18. is there. In the second embodiment, the reflection coefficient at each of the plurality of output terminals 19a, 19b, 19c, and 19d does not need to be already known before the signal measurement. However, the reflection coefficients at each of the plurality of output terminals 19a, 19b, 19c, and 19d need to match (equal reflection coefficient values).

  Hereinafter, the same parts as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  FIG. 6 is a diagram illustrating a configuration of the switch branch signal source 10 according to the second embodiment. The switch branch signal source 10 includes a signal source 110, a switch 18, and output terminals 19a, 19b, 19c, and 19d.

  The signal source 110 is for generating a signal. The signal source 110 includes a signal generation unit 12, an amplifier 13, bridges 14a and 14b, and mixers 16a and 16b. The signal generator 12, the amplifier 13, the bridges 14a and 14b, and the mixers 16a and 16b are the same as those in the first embodiment, and a description thereof is omitted.

  The switch 18 is connected to the signal source 110 and outputs a signal from any of the plurality of output terminals 19a, 19b, 19c, and 19d.

  Any one of the output terminals 19 a, 19 b, 19 c, and 19 d is connected to the signal source 110 by the switch 18. Then, a signal is output from an output terminal connected to the signal source 110.

  Here, when a signal is output from the output terminal 19a, the S parameter of the output of the output terminal 19a is a1, and the S parameter of the output reflected to the output terminal 19a is b1.

  When a signal is output from the output terminal 19b, the S parameter of the output from the output terminal 19b is a2, and the S parameter of the output reflected from the output terminal 19b is b2.

  When a signal is output from the output terminal 19c, the S parameter of the output from the output terminal 19c is a3, and the S parameter of the output reflected from the output terminal 19c is b3.

  When a signal is output from the output terminal 19d, the S parameter of the output from the output terminal 19d is a4, and the S parameter of the output reflected from the output terminal 19d is b4.

  FIG. 7 is a signal flow graph of the switch branch signal source 10 according to the second embodiment. FIG. 7A is a signal flow graph when the signal source 110 is connected to the output terminal 19a. FIG. 7B is a signal flow graph when the signal source 110 is connected to the output terminal 19b. FIG. 7C is a signal flow graph when the signal source 110 is connected to the output terminal 19c. FIG. 7D is a signal flow graph when the signal source 110 is connected to the output terminal 19d.

  In FIG. 7, the output of the signal generator 12 is denoted as SG, the output of the mixer 16a is denoted as R1, and the output of the mixer 16b is denoted as R2. As shown in FIG. 7, R1 = SG × L, where L (S parameter) is the amplification factor of the amplifier 13.

  7A, when the signal source 110 is connected to the output terminal 19a, it can be seen that error factors E11a, E12a, E21a, and E22a (S parameters) are generated. The error factors E11a, E12a, E21a, E22a are referred to as first port error factors.

  Referring to FIG. 7B, it can be seen that when the signal source 110 is connected to the output terminal 19b, error factors E11b, E12b, E21b, E22b (S parameter) are generated. The error factors E11b, E12b, E21b, E22b are referred to as second port error factors.

  Referring to FIG. 7C, it can be seen that when the signal source 110 is connected to the output terminal 19c, error factors E11c, E12c, E21c, E22c (S parameter) are generated. The error factors E11c, E12c, E21c, E22c are referred to as third port error factors.

  7D, when the signal source 110 is connected to the output terminal 19d, it can be seen that error factors E11d, E12d, E21d, and E22d (S parameter) are generated. The error factors E11d, E12d, E21d, and E22d are referred to as fourth port error factors.

  FIG. 8 is a functional block diagram showing the configuration of the error factor determination device 20 according to the second embodiment. The error factor determination device 20 includes terminals 21a and 21b, an error factor recording unit 22, an amplification factor deriving unit 23, a reflection coefficient deriving unit 24, an amplification factor recording unit 25, a true / false determination unit 28, and an amplification factor authenticity determination unit 29. Prepare.

  The terminals 21a and 21b, the amplification factor deriving unit 23, the amplification factor recording unit 25, and the amplification factor authenticity determination unit 29 are the same as those in the first embodiment, and a description thereof is omitted.

  The error factor recording unit 22 is a first port error factor Eija, a second port error factor Eijb, a third port error factor Eijc, and a fourth port error factor Eijd, which are error factors of the switch branch signal source (signal generation system) 10. Record.

  The reflection coefficient deriving unit 24 performs signal measurement results R1 and R2 in a state where signals are output from the output terminals 19a, 19b, 19c, and 19d, and error factors Eija, Eijb, and Eijc recorded in the error factor recording unit 22. And Eijd, the reflection coefficients Xam, Xbm, Xcm and Xdm of the output terminals 19a, 19b, 19c and 19d are derived. However, the signal measurement results R1 and R2 are obtained in a state where the reflection coefficients of the plurality of output terminals 19a, 19b, 19c, and 19d match.

  Specifically, the reflection coefficient deriving unit 24 outputs the output terminal based on the measurement results R1 and R2 of the signal when the signal is output from the output terminal 19a and the error factor Eija recorded in the error factor recording unit 22. The reflection coefficient Xam of 19a is derived (see FIG. 9).

  The reflection coefficient deriving unit 24 is based on the signal measurement results R1 and R2 when the signal is output from the output terminal 19b and the error factor Eijb recorded in the error factor recording unit 22, and the reflection coefficient Xbm of the output terminal 19b. Is derived (see FIG. 10).

  The reflection coefficient deriving unit 24 is based on the measurement results R1 and R2 of the signal when the signal is output from the output terminal 19c and the error factor Eijc recorded in the error factor recording unit 22, and the reflection coefficient Xcm of the output terminal 19c. Is derived (see FIG. 11).

  The reflection coefficient deriving unit 24 is based on the measurement results R1 and R2 of the signal in a state where the signal is output from the output terminal 19d and the error factor Eijd recorded in the error factor recording unit 22, and the reflection coefficient Xdm of the output terminal 19d. Is derived (see FIG. 12).

  Referring to FIGS. 9, 10, 11, and 12, the same calibration tool 62 is connected to each of the plurality of output terminals 19a, 19b, 19c, and 19d. Thereby, the state in which the reflection coefficients of the plurality of output terminals 19a, 19b, 19c, and 19d coincide with each other can be realized. The calibration tool 62 is the same as in the first embodiment, and a description thereof will be omitted.

  In addition, when the plurality of output terminals 19a, 19b, 19c, and 19d are of the same type, the plurality of output terminals 19a, 19b, 19c, and 19c, even if the plurality of output terminals 19a, 19b, 19c, and 19d are not connected. It is possible to realize a state in which the reflection coefficients of 19d coincide with each other. Note that the fact that the plurality of output terminals 19a, 19b, 19c and 19d have the same type means that they have the same reflection coefficient.

  FIG. 13 is a signal flow graph showing the error factor determination device 20 in the state shown in FIGS. 9, 10, 11 and 12 (FIGS. 13A, 13B, 13). c) and FIG. 13 (d)).

  The authenticity determination unit 28 determines whether the error factors Eija, Eijb, Eijc recorded in the error factor recording unit 22 are based on whether the reflection coefficients Xam, Xbm, Xcm, and Xdm derived by the reflection coefficient deriving unit 24 match. And determine whether Eijd is true or false.

  Specifically, if Xam, Xbm, Xcm, and Xdm match, it is determined that error factors Eija, Eijb, Eijc, and Eijd are true. When determining that the error factors Eija, Eijb, Eijc, and Eijd are false, the true / false determination unit 28 recommends measurement of the error factors Eija, Eijb, Eijc, and Eijd or the switch branch signal source (signal generation system) 10. Report a failure.

For example, error factors Eija, Eijb,
Even if it is determined that Eijc and Eijd are false, if the difference among Xam, Xbm, Xcm, and Xdm is within a predetermined range, it is determined that the switch branch signal source 10 has changed over time, and error factors Eija, Eijb, Make recommendations for Eijc and Eijd measurements.

Also, for example, error factors Eija, Eijb,
If it is determined that Eijc and Eijd are false and the difference between Xam, Xbm, Xcm, and Xdm exceeds a predetermined range, it is determined that the switch branch signal source 10 has failed, and a report to that effect I do.

  The case where Xam, Xbm, Xcm, and Xdm match means a case where Xam = Xbm = Xcm = Xdm. However, even if Xam = Xbm = Xcm = Xdm, Xam, Xbm, Xcm and Xdm are regarded as matching if the difference between Xam, Xbm, Xcm and Xdm is within an allowable range. However, the difference between Xam, Xbm, Xcm and Xdm is the difference between the maximum value and the minimum value of Xam, Xbm, Xcm and Xdm.

  Next, the operation of the second embodiment will be described with reference to the flowcharts of FIGS. FIG. 24 is a flowchart showing the operation of the error factor determination device 20 according to the second embodiment. FIG. 25 is a flowchart showing the operation of the authenticity determination unit 28 of the error factor determination device 20 according to the second embodiment.

  First, the calibration tool 62 is attached to a certain output terminal (for example, the output terminal 19a) of the switch branch signal source 10 (S20). The mixer 16a of the switch branch signal source 10 is connected to the terminal 21a of the error factor determination device 20, and the mixer 16b of the switch branch signal source 10 is connected to the terminal 21b of the error factor determination device 20. Further, the switch 18 connects the signal source 110 and the output terminal 19a.

  FIG. 9 is a diagram showing a state in which the calibration tool 62 is connected to the output terminal 19a, and the mixers 16a and 16b are connected to the terminals 21a and 21b. In FIG. 9, the components other than the terminals 21a and 21b and the reflection coefficient deriving unit 24 of the error factor determination device 20 are not shown. R1 is a measurement result of the signal before the error factor Eija occurs. R2 is the measurement result of the reflected signal. R1 and R2 are signal measurement results.

  However, the reflected signal is a signal (b1) obtained by reflecting the signal (a1) output from the output terminal 19a by the calibration tool 62. The signal (b1) reflected by the calibration tool 62 is given to the bridge 14b via the switch 18. The reflected signal given to the bridge 14b is given to the mixer 16b and multiplied with the local signal. The output of the mixer 16b is R2.

  A signal before the error factor Eija is generated is given to the bridge 14a. The signal supplied to the bridge 14a is supplied to the mixer 16a and multiplied with the local signal. The output of the mixer 16a is R1.

  In this way, R1 and R2 are measured (S22).

  The measured R1 and R2 are given to the reflection coefficient deriving unit 24.

  FIG. 13A is a signal flow graph showing the error factor determination device 20 in the state shown in FIG. In FIG. 13A, the above equation (1) is established. Where X is a load coefficient of the calibration tool 62. When equation (1) is solved for X, equation (2) above is obtained.

  The reflection coefficient deriving unit 24 substitutes the signal measurement results R1 and R2 into Expression (2). Further, the reflection coefficient deriving unit 24 reads out the error factor Eija recorded in the error factor recording unit 22 and substitutes it into the equation (2). Thereby, the reflection coefficient deriving unit 24 derives the load coefficient of the calibration tool 62, that is, the reflection coefficient X of the output terminal 19a (S24).

  The derived reflection coefficient X is Xam as described above.

  Thereafter, until the calibration tool 62 is attached to all of the output terminals 19a, 19b, 19c, and 19d (S25, Yes), the calibration tool 62 is attached to another output terminal (S26).

  For example, the calibration tool 62 is attached to the output terminal 19b of the switch branch signal source 10 (S26). Further, the switch 18 connects the signal source 110 and the output terminal 19b.

  FIG. 10 is a diagram showing a state in which the calibration tool 62 is connected to the output terminal 19b, and the mixers 16a and 16b are connected to the terminals 21a and 21b. In FIG. 10, the components other than the terminals 21a and 21b and the reflection coefficient deriving unit 24 of the error factor determination device 20 are not shown. R1 is the measurement result of the signal before the error factor Eijb occurs. R2 is the measurement result of the reflected signal. R1 and R2 are signal measurement results.

  However, the reflected signal is a signal (b2) obtained by reflecting the signal (a2) output from the output terminal 19b by the calibration tool 62. The signal (b2) reflected by the calibration tool 62 is given to the bridge 14b via the switch 18. The reflected signal given to the bridge 14b is given to the mixer 16b and multiplied with the local signal. The output of the mixer 16b is R2.

  Further, the signal before the error factor Eijb is generated is given to the bridge 14a. The signal supplied to the bridge 14a is supplied to the mixer 16a and multiplied with the local signal. The output of the mixer 16a is R1.

  In this way, R1 and R2 are measured (S22).

  The measured R1 and R2 are given to the reflection coefficient deriving unit 24.

  FIG. 13B is a signal flow graph showing the error factor determination device 20 in the state shown in FIG. In FIG.13 (b), said Formula (1) is materialized. Where X is a load coefficient of the calibration tool 62. When equation (1) is solved for X, equation (2) above is obtained.

  The reflection coefficient deriving unit 24 substitutes the signal measurement results R1 and R2 into Expression (2). Further, the reflection coefficient deriving unit 24 reads the error factor Eijb recorded in the error factor recording unit 22 and substitutes it into the equation (2). Thereby, the reflection coefficient deriving unit 24 derives the load coefficient of the calibration tool 62, that is, the reflection coefficient X of the output terminal 19a (S24).

  The derived reflection coefficient X is Xbm as described above.

  Further, the calibration tool 62 is attached to the output terminal 19c of the switch branch signal source 10 (S26). Further, the switch 18 connects the signal source 110 and the output terminal 19c.

  FIG. 11 is a diagram showing a state in which the calibration tool 62 is connected to the output terminal 19c, and the mixers 16a and 16b are connected to the terminals 21a and 21b. In FIG. 11, the components other than the terminals 21a and 21b and the reflection coefficient deriving unit 24 of the error factor determination device 20 are not shown. R1 is the measurement result of the signal before the error factor Eijc occurs. R2 is the measurement result of the reflected signal. R1 and R2 are signal measurement results.

  However, the reflected signal is a signal (b3) obtained by reflecting the signal (a3) output from the output terminal 19c by the calibration tool 62. Further, the signal (b3) reflected by the calibration tool 62 is given to the bridge 14b through the switch 18. The reflected signal given to the bridge 14b is given to the mixer 16b and multiplied with the local signal. The output of the mixer 16b is R2.

  Further, the signal before the error factor Eijc is generated is given to the bridge 14a. The signal supplied to the bridge 14a is supplied to the mixer 16a and multiplied with the local signal. The output of the mixer 16a is R1.

  In this way, R1 and R2 are measured (S22).

  The measured R1 and R2 are given to the reflection coefficient deriving unit 24.

  FIG.13 (c) is the figure which represented the error factor determination apparatus 20 of the state shown in FIG. 11 with the signal flow graph. In FIG.13 (c), said Formula (1) is materialized. Where X is a load coefficient of the calibration tool 62. When equation (1) is solved for X, equation (2) above is obtained.

  The reflection coefficient deriving unit 24 substitutes the signal measurement results R1 and R2 into Expression (2). Further, the reflection coefficient deriving unit 24 reads the error factor Eijc recorded in the error factor recording unit 22 and substitutes it into the equation (2). Thereby, the reflection coefficient deriving unit 24 derives the load coefficient of the calibration tool 62, that is, the reflection coefficient X of the output terminal 19a (S24).

  The derived reflection coefficient X is Xcm as described above.

  Further, the calibration tool 62 is attached to the output terminal 19d of the switch branch signal source 10 (S26). Further, the switch 18 connects the signal source 110 and the output terminal 19d.

  FIG. 12 is a diagram showing a state in which the calibration tool 62 is connected to the output terminal 19d, and the mixers 16a and 16b are connected to the terminals 21a and 21b. In FIG. 12, the components other than the terminals 21a and 21b and the reflection coefficient deriving unit 24 of the error factor determination device 20 are not shown. R1 is a measurement result of the signal before the error factor Eijd occurs. R2 is the measurement result of the reflected signal. R1 and R2 are signal measurement results.

  However, the reflected signal is a signal (b4) obtained by reflecting the signal (a4) output from the output terminal 19d by the calibration tool 62. Further, the signal (b4) reflected by the calibration tool 62 is given to the bridge 14b through the switch 18. The reflected signal given to the bridge 14b is given to the mixer 16b and multiplied with the local signal. The output of the mixer 16b is R2.

  Further, the signal before the error factor Eijd is generated is given to the bridge 14a. The signal supplied to the bridge 14a is supplied to the mixer 16a and multiplied with the local signal. The output of the mixer 16a is R1.

  In this way, R1 and R2 are measured (S22).

  The measured R1 and R2 are given to the reflection coefficient deriving unit 24.

  FIG. 13D is a signal flow graph showing the error factor determination device 20 in the state shown in FIG. In FIG.13 (d), said Formula (1) is materialized. Where X is a load coefficient of the calibration tool 62. When equation (1) is solved for X, equation (2) above is obtained.

  The reflection coefficient deriving unit 24 substitutes the signal measurement results R1 and R2 into Expression (2). Further, the reflection coefficient deriving unit 24 reads the error factor Eijd recorded in the error factor recording unit 22 and substitutes it into the equation (2). Thereby, the reflection coefficient deriving unit 24 derives the load coefficient of the calibration tool 62, that is, the reflection coefficient X of the output terminal 19a (S24).

  The derived reflection coefficient X is Xdm as described above.

  In this way, when the calibration tool 62 is attached to all of the output terminals 19a, 19b, 19c and 19d (S25, Yes), the true / false judgment unit 28 compares the derived reflection coefficients Xam, Xbm, Xcm and Xdm. Performed (S28).

  In addition, the derived reflection coefficients Xam, Xbm, Xcm, and Xdm are given to the authenticity determination unit 28.

  The measurement results R1 and R2 of the signals are obtained in a state where the reflection coefficients of the plurality of output terminals 19a, 19b, 19c, and 19d match. Therefore, the derived reflection coefficients Xam, Xbm, Xcm, and Xdm should essentially match the true values Xt of the reflection coefficients of the plurality of output terminals 19a, 19b, 19c, and 19d. Thus, Xam, Xbm, Xcm and Xdm should match (Xam = Xbm = Xcm = Xdm).

If Xam, Xbm, Xcm, and Xdm do not match, it is possible that the error factors Eija, Eijb, Eijc, and Eijd recorded in the error factor recording unit 22 are incorrect. That is, error factors Eija, recorded in the error factor recording unit 22 are recorded.
Eijb, Eijc and Eijd are error factors of the switch branch signal source (signal generation system) 10 at the time of signal measurement.
That is, it does not agree with Eijb, Eijc and Eijd. Such a phenomenon is considered to occur, for example, due to aging or failure of the switch branch signal source 10.

  Therefore, the authenticity of the error factors Eija, Eijb, Eijc, and Eijd recorded in the error factor recording unit 22 can be determined based on whether Xam, Xbm, Xcm, and Xdm match.

If the true value Xt of the reflection coefficient is already known before the signal measurement, whether Xam matches Xt, whether Xbm matches Xt, whether Xcm matches Xt The error factors Eija, Eijb, recorded in the error factor recording unit 22 also depend on whether or not Xdm matches Xt.
The authenticity of Eijc and Eijd can be determined. This is the case when the idea of the first embodiment is applied to the switch branch signal source 10.

  The second embodiment is different from the first embodiment in that the true value Xt of the reflection coefficient may not be known.

  The operation of the authenticity determination unit 28 will be described with reference to the flowchart of FIG.

The true / false determination unit 28 calculates the derived reflection coefficient Xam,
It is determined whether Xbm, Xcm, and Xdm match (S280). If Xam, Xbm, Xcm, and Xdm match (S280, Yes), it is determined that the error factors Eija, Eijb, Eijc, and Eijd recorded in the error factor recording unit 22 are true (S281).

  If Xam, Xbm, Xcm, and Xdm do not match (S280, No), it is determined that the error factors Eija, Eijb, Eijc, and Eijd recorded in the error factor recording unit 22 are false (S282).

  Here, even if Xam, Xbm, Xcm, and Xdm do not match, if the difference between Xam, Xbm, Xcm, and Xdm is within a predetermined range (S284, Yes), the authenticity determination unit 28 switches the switch branch signal. It is determined that the source 10 has changed over time, and measurement of error factors Eija, Eijb, Eijc, and Eijd is recommended (S286). For example, a message recommending measurement of error factors Eija, Eijb, Eijc, and Eijd (for example, “Please perform calibration”) is displayed on the display (not shown) of the error factor determination device 20.

  If Xam, Xbm, Xcm, and Xdm do not match and the difference between Xam, Xbm, Xcm, and Xdm is not within a predetermined range (S284, No), the true / false determination unit 28 uses the switch branch signal source It is determined that there are ten failures, and a report to that effect is made (S288). For example, a message (for example, “the signal generation system has failed”) is displayed on the display (not shown) of the error factor determination device 20.

  An operation for determining the authenticity of the amplification factor of the amplifier 13 recorded in the amplification factor recording unit 25 will be described.

  The attachment of the calibration tool 62 (S20, S26) and the measurement of R1, R2 (S22) are the same as the above operation. Thereafter, the signal power SG and the measured R1 are supplied to the amplification factor deriving unit 23. The amplification factor deriving unit 23 derives the amplification factor L as L = R1 / SG. Then, the gain authenticity determination unit 29 determines the authenticity of the recorded gain based on the gain recorded in the gain recording unit 25 and the gain derived by the gain deriving unit 23. .

  According to the second embodiment, the same calibration tool 62 is connected to the output terminals 19a, 19b, 19c, 19d, or nothing is connected to the output terminals 19a, 19b, 19c, 19d (no connection state) ( However, if R1 and R2 are measured in the state where the reflection coefficients of the output terminals 19a, 19b, 19c, and 19d match), the error factors Eija, Eijb, The authenticity of Eijc and Eijd can be determined. Moreover, the determination can be made without knowing the true value Xt of the reflection coefficient of the output terminals 19a, 19b, 19c, and 19d.

  That is, at the output terminals 19a, 19b, 19c, and 19d, three types of states of open (open), short (short-circuit), and load (standard load Z0) are realized, and a power meter is connected to the error factors Eija, Even if Eijb, Eijc and Eijd are not measured, it is possible to determine whether the error factors Eija, Eijb, Eijc and Eijd recorded in the error factor recording unit 22 are true or false. Is easy to determine.

  If it is determined that the error factors Eija, Eijb, Eijc, and Eijd are true, the error factors Eija, Eijb, Eijc recorded in the error factor recording unit 22 as the error factors of the switch branch signal source (signal generation system) 10. And Eijd is available. Since it is not necessary to measure the error factors Eija, Eijb, Eijc and Eijd, the labor required for calibration can be reduced.

  If it is determined that the error factors Eija, Eijb, Eijc, and Eijd are false, it may be necessary to measure the error factor of the switch branch signal source (signal generation system) 10. However, since it is not necessary to measure the error factor every time the circuit parameter of the device under test is measured, the labor required for calibration can be reduced.

Third Embodiment The third embodiment is an embodiment related to a configuration in which a plurality of signal generation units 12 (signal generation units 12a and 12b) of the signal generation system 100 in the first embodiment are provided. In the third embodiment, it is not necessary that the reflection coefficient at the output terminal 19a is already known before the signal measurement.

  FIG. 14 is a diagram illustrating a configuration of a signal generation system 100 according to the third embodiment. The signal generation system 100 includes a switch 11, signal generation units 12a and 12b, an amplifier 13, bridges 14a and 14b, mixers 16a and 16b, and an output terminal 19a.

  Hereinafter, the same parts as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  Each of the plurality of signal generation units 12 a and 12 b is the same as the signal generation unit 12. The output of the signal generator 12a is SG1, and the output of the signal generator 12b is SG2.

  The switch 11 connects one of the signal generation units 12 a and 12 b to the amplifier 13. Therefore, the signal generated by the signal generation unit 12 a or the signal generated by the signal generation unit 12 b is supplied to the amplifier 13.

  The amplifier 13, the bridges 14a and 14b, the mixers 16a and 16b, and the output terminal 19a are the same as those in the first embodiment, and a description thereof is omitted. The output terminal 19a is a single output terminal as in the first embodiment.

  FIG. 15 is a signal flow graph of the signal generation system 100 according to the third embodiment.

  In FIG. 15, the output of the mixer 16a is denoted as R1, and the output of the mixer 16b is denoted as R2. Further, as shown in FIG. 15A, R1 = SG1 × L1. Further, as shown in FIG. 15B, R1 = SG2 × L2. However, L1 and L2 (S parameter) are amplification factors of the amplifier 13. The amplification factors of the amplifier 13 take different values (L1, L2) due to differences in the frequency of the signals generated by the signal generators 12a, 12b.

  Referring to FIG. 15, it can be seen that error factors E11a, E12a, E21a, E22a (S parameters) are generated in the signal generation system 100.

  FIG. 16 is a functional block diagram showing the configuration of the error factor determination device 20 according to the third embodiment. The error factor determination device 20 includes terminals 21a and 21b, an error factor recording unit 22, an amplification factor deriving unit 23, a reflection coefficient deriving unit 24, an amplification factor recording unit 25, a true / false determination unit 28, and an amplification factor authenticity determination unit 29. Prepare.

  The terminals 21a and 21b and the error factor recording unit 22 are the same as those in the first embodiment, and a description thereof will be omitted.

  The amplification factor deriving unit 23 amplifies as L1 = R1 / SG1 and L2 = R1 / SG2 based on the signal measurement result R1 in the state where the signal is output from the output terminal 19a and the signal powers SG1 and SG2. The rates L1 and L2 are derived. The values of the signal powers SG1 and SG2 are given to the amplification factor deriving unit 23 from the outside of the error factor determination device 20. Further, the signal measurement result R1 is provided to the amplification factor deriving unit 23 via the terminal 21a.

  The amplification factor recording unit 25 records the amplification factors L1 and L2 of the amplifier 13.

  The amplification factor authenticity determination unit 29 is the same as in the first embodiment, and a description thereof is omitted.

  The reflection coefficient deriving unit 24 receives the signal measurement results R1 and R2 in a state where the signal is output from the output terminal 19a of the signal generation system 100 via the terminals 21a and 21b. Further, the reflection coefficient deriving unit 24 reads the error factor Eija from the error factor recording unit 22. Moreover, the reflection coefficient deriving unit 24 derives the reflection coefficients Xm1 and Xm2 of the output terminal 19a based on the signal measurement results R1 and R2 and the error factor Eija. However, Xm1 is derived when the signal generator 12a is connected to the amplifier 13 (see FIGS. 17 and 19). Xm2 is derived when the signal generator 12b is connected to the amplifier 13 (see FIGS. 18 and 19). That is, the reflection coefficient deriving unit 24 derives the reflection coefficients Xm1 and Xm2 of the output terminal 19a for each of the signal generation units 12a and 12b.

  FIG. 19 is a signal flow graph of the error factor determination device 20 in the state shown in FIGS. 17 and 18 (FIGS. 19A and 19B).

  17 and 18 show an example in which the calibration tool 62 is attached to the output terminal 19a. However, it is conceivable that nothing is connected to the output terminal 19a (no connection state). Since the non-connection state is easier to realize than the case where the calibration tool 62 is connected, it is preferable that the non-connection state be a non-connection state. In the non-connected state, the phase change due to reflection is zero. Since the calibration tool 62 is the same as that of the first embodiment, description thereof is omitted.

  However, the state of the output terminal 19a when the signal generator 12a is connected to the amplifier 13 and the state of the output terminal 19a when the signal generator 12b is connected to the amplifier 13 must be the same.

  For example, it is assumed that the calibration tool 62 is connected to the output terminal 19a when the signal generator 12a is connected to the amplifier 13. In this case, the calibration tool 62 (or a calibration tool having the same reflection coefficient as that of the calibration tool 62) is also connected to the output terminal 19a when the signal generation unit 12b is connected to the amplifier 13.

  For example, it is assumed that nothing is connected to the output terminal 19 a when the signal generation unit 12 a is connected to the amplifier 13. In this case, nothing is connected to the output terminal 19a when the signal generator 12b is connected to the amplifier 13.

  The authenticity determination unit 28 determines the authenticity of the error factor Eija recorded in the error factor recording unit 22 based on whether or not the reflection coefficients Xm1 and Xm2 derived by the reflection coefficient deriving unit 24 match.

  Specifically, if Xm1 and Xm2 match, it is determined that the error factor Eija is true. When determining that the error factor Eija is false, the true / false determination unit 28 recommends measurement of the error factor Eija or reports a failure of the signal generation system 100.

  For example, even if it is determined that the error factor Eija is false, if the difference between Xm1 and Xm2 is within a predetermined range, it is determined that the signal generation system 100 has changed over time, and the measurement of the error factor Eija is recommended. .

  Further, for example, if it is determined that the error factor Eija is false and the difference between Xm1 and Xm2 exceeds a predetermined range, it is determined that the signal generation system 100 has failed, and a report to that effect is given. Do.

The case where Xm1 and Xm2 match each other means the case where Xm1 = Xm2. But Xm1
Even if it is not = Xm2, Xm1 and Xm2 are regarded as matching if the difference between Xm1 and Xm2 is within an allowable range.

  Next, the operation of the third embodiment will be described with reference to the flowcharts of FIGS. FIG. 26 is a flowchart showing the operation of the error factor determination device 20 according to the third embodiment. FIG. 27 is a flowchart showing the operation of the authenticity determination unit 28 of the error factor determination device 20 according to the third embodiment.

  First, the calibration tool 62 is attached to the output terminal 19a of the signal generation system 100 (S30). Further, the mixer 16 a of the signal generation system 100 is connected to the terminal 21 a of the error factor determination device 20, and the mixer 16 b of the signal generation system 100 is connected to the terminal 21 b of the error factor determination device 20.

  Further, the switch 11 connects a signal generation unit (for example, the signal generation unit 12a) to the amplifier 13 (S31).

  FIG. 17 is a diagram illustrating a state in which the calibration tool 62 is connected to the output terminal 19 a, the mixers 16 a and 16 b are connected to the terminals 21 a and 21 b, and the signal generation unit 12 a is connected to the amplifier 13. In FIG. 17, the components other than the terminals 21 a and 21 b and the reflection coefficient deriving unit 24 of the error factor determination device 20 are not shown. R1 is a measurement result of the signal before the error factor Eija occurs. R2 is the measurement result of the reflected signal. R1 and R2 are signal measurement results.

  However, the reflected signal is a signal (b1) obtained by reflecting the signal (a1) output from the output terminal 19a by the calibration tool 62. The signal (b1) reflected by the calibration tool 62 is given to the bridge 14b via the switch 18. The reflected signal given to the bridge 14b is given to the mixer 16b and multiplied with the local signal. The output of the mixer 16b is R2.

  A signal before the error factor Eija is generated is given to the bridge 14a. The signal supplied to the bridge 14a is supplied to the mixer 16a and multiplied with the local signal. The output of the mixer 16a is R1.

  In this way, R1 and R2 are measured (S32).

  The measured R1 and R2 are given to the reflection coefficient deriving unit 24.

  FIG. 19A is a signal flow graph showing the error factor determination device 20 in the state shown in FIG. In FIG. 19A, the above equation (1) is established. Where X is a load coefficient of the calibration tool 62. When equation (1) is solved for X, equation (2) above is obtained.

  The reflection coefficient deriving unit 24 substitutes the signal measurement results R1 and R2 into Expression (2). Further, the reflection coefficient deriving unit 24 reads out the error factor Eija recorded in the error factor recording unit 22 and substitutes it into the equation (2). Thereby, the reflection coefficient deriving unit 24 derives the load coefficient of the calibration tool 62, that is, the reflection coefficient X of the output terminal 19a (S34).

  The derived reflection coefficient X is Xm1 as described above.

  Thereafter, another signal generator is connected to the amplifier 13 until all of the signal generators 12a and 12b are connected to the amplifier 13 (S35, Yes) (S36).

  For example, the switch 11 connects another signal generation unit (for example, the signal generation unit 12 b) to the amplifier 13.

  FIG. 18 is a diagram illustrating a state in which the calibration tool 62 is connected to the output terminal 19 a, the mixers 16 a and 16 b are connected to the terminals 21 a and 21 b, and the signal generation unit 12 b is connected to the amplifier 13. In FIG. 18, the components other than the terminals 21a and 21b and the reflection coefficient deriving unit 24 of the error factor determination device 20 are not shown. R1 is a measurement result of the signal before the error factor Eija occurs. R2 is the measurement result of the reflected signal. R1 and R2 are signal measurement results.

  However, the reflected signal is a signal (b1) obtained by reflecting the signal (a1) output from the output terminal 19a by the calibration tool 62. The signal (b1) reflected by the calibration tool 62 is given to the bridge 14b via the switch 18. The reflected signal given to the bridge 14b is given to the mixer 16b and multiplied with the local signal. The output of the mixer 16b is R2.

  A signal before the error factor Eija is generated is given to the bridge 14a. The signal supplied to the bridge 14a is supplied to the mixer 16a and multiplied with the local signal. The output of the mixer 16a is R1.

  In this way, R1 and R2 are measured (S32).

  The measured R1 and R2 are given to the reflection coefficient deriving unit 24.

  FIG. 19B is a signal flow graph showing the error factor determination device 20 in the state shown in FIG. In FIG.19 (b), said Formula (1) is materialized. Where X is a load coefficient of the calibration tool 62. When equation (1) is solved for X, equation (2) above is obtained.

  The reflection coefficient deriving unit 24 substitutes the signal measurement results R1 and R2 into Expression (2). Further, the reflection coefficient deriving unit 24 reads out the error factor Eija recorded in the error factor recording unit 22 and substitutes it into the equation (2). Thereby, the reflection coefficient deriving unit 24 derives the load coefficient of the calibration tool 62, that is, the reflection coefficient X of the output terminal 19a (S34).

  The derived reflection coefficient X is Xm2, as described above.

  In this way, when all of the signal generation units 12a and 12b are connected to the amplifier 13 (S35, Yes), the true / false determination unit 28 compares the derived reflection coefficients Xm1 and Xm2 (S38).

  The authenticity determination unit 28 is provided with the derived reflection coefficients Xm1 and Xm2.

  The signal measurement results R1 and R2 are obtained for a single output terminal 19a. Therefore, the derived reflection coefficients Xm1 and Xm2 should essentially match the true value Xt of the output terminal 19a. Thus, Xm1 and Xm2 should match (Xm1 = Xm2).

  If Xm1 and Xm2 do not match, it is possible that the error factor Eija recorded in the error factor recording unit 22 is incorrect. That is, the error factor Eija recorded in the error factor recording unit 22 does not match the error factor Eija of the signal generation system 100 at the time of signal measurement. Such a phenomenon is considered to occur due to, for example, a change with time or a failure of the signal generation system 100.

  Therefore, the authenticity of the error factor Eija recorded in the error factor recording unit 22 can be determined based on whether Xm1 and Xm2 match.

  If the true value Xt of the reflection coefficient is already known before the signal measurement, the error factor recording unit 22 also depends on whether Xm1 matches Xt or whether Xm2 matches Xt. The authenticity of the error factor Eija recorded in can be determined. This is the case when the idea of the first embodiment is applied to the signal generation system 100 according to the third embodiment.

  The third embodiment is different from the first embodiment in that the true value Xt of the reflection coefficient may not be known.

  The operation of the authenticity determination unit 28 will be described with reference to the flowchart of FIG.

  The authenticity determination unit 28 determines whether or not the derived reflection coefficients Xm1 and Xm2 match (S380). If Xm1 and Xm2 match (S380, Yes), it is determined that the error factor Eija recorded in the error factor recording unit 22 is true (S381).

  If Xm1 and Xm2 do not match (S380, No), it is determined that the error factor Eija recorded in the error factor recording unit 22 is false (S382).

  Here, even if Xm1 and Xm2 do not match, if the difference between Xm1 and Xm2 is within a predetermined range (S384, Yes), the true / false determination unit 28 determines that the signal generation system 100 has changed over time, An error factor Eija is recommended for measurement (S386). For example, a message (for example, “Please perform calibration”) recommending measurement of the error factor Eija is displayed on the display (not shown) of the error factor determination device 20.

  If Xm1 and Xm2 do not match and the difference between Xm1 and Xm2 is not within the predetermined range (S384, No), the authenticity determination unit 28 determines that the signal generation system 100 is faulty, and accordingly. Is reported (S388). For example, a message (for example, “the signal generation system has failed”) is displayed on the display (not shown) of the error factor determination device 20.

  An operation for determining the authenticity of the amplification factor of the amplifier 13 recorded in the amplification factor recording unit 25 will be described.

  Attachment of the calibration tool 62 (S30), connection of the signal generator (S31, S36), and measurement of R1 and R2 (S32) are the same as the above-described operation. Thereafter, the signal powers SG <b> 1 and SG <b> 2 and the measured R <b> 1 are provided to the amplification factor deriving unit 23. The amplification factor deriving unit 23 derives the amplification factor L1 as L1 = R1 / SG1, and derives the amplification factor L2 as L2 = R1 / SG2. Then, the gain authenticity determination unit 29 determines the authenticity of the recorded gain based on the gain recorded in the gain recording unit 25 and the gain derived by the gain deriving unit 23. .

  According to the third embodiment, if R1 and R2 are measured in a state where the calibration tool 62 is connected to the output terminal 19a or nothing is connected to the output terminal 19a (no connection state), error factor recording is performed. Whether the error factor Eija recorded in the section 22 is true or false can be determined. Moreover, the determination can be made without knowing the true value Xt of the reflection coefficient of the output terminal 19a.

  In other words, at the output terminal 19a, three types of states of open (open), short (short circuit), and load (standard load Z0) are realized, and a power meter is also connected without measuring the error factor Eija. Since it is possible to determine whether the error factor Eija recorded in the error factor recording unit 22 is true or false, it is easy to determine whether the error factor Eija is true or false.

  If it is determined that the error factor Eija is true, the error factor Eija recorded in the error factor recording unit 22 can be used as the error factor of the signal generation system 100. Since it is not necessary to measure the error factor Eija, the labor required for calibration can be reduced.

  If the error factor Eija is determined to be false, it may be necessary to measure the error factor of the signal generation system 100. However, since it is not necessary to measure the error factor every time the circuit parameter of the device under test is measured, the labor required for calibration can be reduced.

  An example of how the error factor determination device 20 is used will be described.

  FIG. 20 is a diagram illustrating an example of the configuration of the output correction device 1 when the error factor determination device 20 is used in the output correction device 1.

  It is assumed that a signal is to be output from the output terminal 19d of the switch branch signal source 10 according to the second embodiment. Further, it is assumed that the power of this signal is adjusted to the target value. Here, it is necessary to adjust the gain of the amplifier 13 in consideration of the influence of the fourth port error factor Eijd.

  The output correction device 1 includes an error factor determination device 20 and a signal power adjustment unit 30. The details of the error factor determination device 20 are as described above, but the error factor determination device 20 reads the fourth port error factor Eijd from the error factor recording unit 22 and gives it to the signal power adjustment unit 30. It is assumed that the fourth port error factor Eijd is determined to be true by the authenticity determination unit 28.

  The signal power adjustment unit 30 adjusts the power of the signal based on the fourth port error factor Eijd given from the error factor determination device 20. For example, the signal power adjustment unit 30 adjusts the power of the signal by adjusting the gain of the amplifier 13. With this adjustment, the power of the signal output from the output terminal 19d can be adjusted to the target value.

  In order to adjust the power of the signal output from the output terminal 19 a to the target value, the first port error factor Eija may be given to the signal power adjustment unit 30 from the error factor determination device 20. The signal power adjustment unit 30 adjusts the power of the signal based on the first port error factor Eija given from the error factor determination device 20. The error factor determination device 20 reads the first port error factor Eija from the error factor recording unit 22 and gives it to the signal power adjustment unit 30. It is assumed that the first port error factor Eija is determined to be true by the authenticity determination unit 28.

  In order to adjust the power of the signal output from the output terminal 19b to the target value, the second port error factor Eijb may be given to the signal power adjustment unit 30 from the error factor determination device 20. The signal power adjustment unit 30 adjusts the power of the signal based on the second port error factor Eijb given from the error factor determination device 20. The error factor determination device 20 reads the second port error factor Eijb from the error factor recording unit 22 and supplies the second port error factor Eijb to the signal power adjustment unit 30. It is assumed that the second port error factor Eijb is determined to be true by the authenticity determination unit 28.

  In order to adjust the power of the signal output from the output terminal 19 c to the target value, the third port error factor Eijc may be given from the error factor determination device 20 to the signal power adjustment unit 30. The signal power adjustment unit 30 adjusts the power of the signal based on the third port error factor Eijc given from the error factor determination device 20. The error factor determination device 20 reads the third port error factor Eijc from the error factor recording unit 22 and supplies the third port error factor Eijc to the signal power adjustment unit 30. It is assumed that the third port error factor Eijc is determined to be true by the authenticity determination unit 28.

  Instead of the switch branch signal source 10 according to the second embodiment, it is assumed that the power of the signal output from the signal generation system 100 according to the first embodiment and the third embodiment is set to the target value. Here, it is necessary to adjust the gain of the amplifier 13 in consideration of the influence of the first port error factor Eija. Even in such a case, the configuration of the output correction apparatus 1 is the same as described above. The signal power adjustment unit 30 adjusts the power of the signal based on the first port error factor Eija given from the error factor determination device 20. The error factor determination device 20 reads the first port error factor Eija from the error factor recording unit 22 and gives it to the signal power adjustment unit 30. It is assumed that the first port error factor Eija is determined to be true by the authenticity determination unit 28.

  FIG. 21 is a diagram illustrating an example of the configuration of the reflection coefficient measurement device 2 when the error factor determination device 20 is used in the reflection coefficient measurement device 2.

A device under test (DUT: Device Under) is connected to the output terminal 19d of the switch branch signal source 10.
Test) 66 is connected, and the reflection coefficient of the device under test 66 is to be measured. The reflection coefficient of the DUT 66 can be obtained from R1 and R2. Here, it is necessary to obtain the reflection coefficient in consideration of the influence of the fourth port error factor Eijd.

  The reflection coefficient measurement device 2 includes an error factor determination device 20 and a reflection coefficient measurement unit 40. The details of the error factor determination device 20 are as described above, but the error factor determination device 20 reads the fourth port error factor Eijd from the error factor recording unit 22 and gives it to the reflection coefficient measurement unit 40. It is assumed that the fourth port error factor Eijd is determined to be true by the authenticity determination unit 28.

  The reflection coefficient measuring unit 40 measures the result R1 of the signal before the fourth port error factor Eijd is generated, and the result R2 of measuring the signal reflected by the device under test 66 (the signal is reflected by the device under test 66). Is applied to the mixer 16b via the switch 18 and the bridge 14b) and the reflection coefficient of the DUT 66 is measured based on the fourth port error factor Eijd provided from the error factor determination device 20. .

  In order to measure the reflection coefficient of the DUT 66 connected to the output terminal 19a, the first port error factor Eija may be given from the error factor determination device 20 to the reflection coefficient measurement unit 40. The reflection coefficient measurement unit 40 measures the reflection coefficient of the DUT 66 based on R1 and R2 and the first port error factor Eija given from the error factor determination device 20. The error factor determination device 20 reads the first port error factor Eija from the error factor recording unit 22 and gives it to the reflection coefficient measurement unit 40. It is assumed that the first port error factor Eija is determined to be true by the authenticity determination unit 28.

  In order to measure the reflection coefficient of the DUT 66 connected to the output terminal 19b, the second port error factor Eijb may be supplied from the error factor determination device 20 to the reflection coefficient measurement unit 40. The reflection coefficient measurement unit 40 measures the reflection coefficient of the DUT 66 based on R1 and R2 and the second port error factor Eijb given from the error factor determination device 20. The error factor determination device 20 reads the second port error factor Eijb from the error factor recording unit 22 and gives it to the reflection coefficient measurement unit 40. It is assumed that the second port error factor Eijb is determined to be true by the authenticity determination unit 28.

  In order to measure the reflection coefficient of the DUT 66 connected to the output terminal 19 c, the third port error factor Eijc may be given from the error factor determination device 20 to the reflection coefficient measurement unit 40. The reflection coefficient measurement unit 40 measures the reflection coefficient of the DUT 66 based on R1 and R2 and the third port error factor Eijc given from the error factor determination device 20. The error factor determination device 20 reads the third port error factor Eijc from the error factor recording unit 22 and gives it to the reflection coefficient measurement unit 40. It is assumed that the third port error factor Eijc is determined to be true by the authenticity determination unit 28.

  Instead of the switch branch signal source 10 according to the second embodiment, a device under test (DUT) 66 is connected to the output terminal 19a of the signal generation system 100 according to the first and third embodiments. It is assumed that the reflection coefficient of the device under test 66 is to be measured and connected. Here, it is necessary to obtain the reflection coefficient in consideration of the influence of the first port error factor Eija. Even in such a case, the configuration of the reflection coefficient measuring apparatus 2 is the same as described above. The reflection coefficient measurement unit 40 measures the reflection coefficient of the DUT 66 based on R1 and R2 and the first port error factor Eija given from the error factor determination device 20. The error factor determination device 20 reads the first port error factor Eija from the error factor recording unit 22 and gives it to the reflection coefficient measurement unit 40. It is assumed that the first port error factor Eija is determined to be true by the authenticity determination unit 28.

  In the above embodiment, an example in which there is one signal generation system 100 (first and third embodiments) and only one switch branch signal source 10 (second embodiment) has been described. However, even if there are two or more signal generation systems 100, the error factor determination device 20 according to the above embodiment can be connected to each of the signal generation systems 100 and used. Even if there are two or more switch branch signal sources 10, the error factor determination device 20 according to the above embodiment can be connected to each switch branch signal source 10 and used.

  Moreover, said embodiment is realizable as follows. A program for realizing each of the above parts (for example, the error factor determination device 20) was recorded on a computer media reading device equipped with a CPU, hard disk, and media (floppy (registered trademark) disk, CD-ROM, etc.) reading device. Read the media and install it on the hard disk. Such a method can also realize the above functions.

1 is a diagram illustrating a configuration of a signal generation system 100 according to a first embodiment. It is a signal flow graph of the signal generation system 100 concerning a first embodiment. It is a functional block diagram which shows the structure of the error factor determination apparatus 20 concerning 1st embodiment. It is a figure which shows the state which connected the calibration tool 62 to the output terminal 19a, and the mixers 16a and 16b to the terminals 21a and 21b. It is the figure which represented the error factor determination apparatus 20 of the state shown in FIG. 4 with the signal flow graph. It is a figure which shows the structure of the switch branch signal source 10 concerning 2nd embodiment. It is a signal flow graph of the switch branch signal source 10 concerning 2nd embodiment. It is a functional block diagram which shows the structure of the error factor determination apparatus 20 concerning 2nd embodiment. It is a figure which shows the state which connected the calibration tool 62 to the output terminal 19a, and the mixers 16a and 16b to the terminals 21a and 21b. It is a figure which shows the state which connected the calibration tool 62 to the output terminal 19b, and the mixers 16a and 16b to the terminals 21a and 21b. It is a figure which shows the state which connected the calibration tool 62 to the output terminal 19c, and the mixers 16a and 16b to the terminals 21a and 21b. It is a figure which shows the state which connected the calibration tool 62 to the output terminal 19d, and the mixers 16a and 16b to the terminals 21a and 21b. FIGS. 13 (a), 13 (b), 13 (c), and 13 (13) are diagrams representing the error factor determination device 20 in the states shown in FIGS. 9, 10, 11 and 12 in a signal flow graph. d)). It is a figure which shows the structure of the signal generation system 100 concerning 3rd embodiment. It is a signal flow graph of the signal generation system 100 concerning 3rd embodiment. It is a functional block diagram which shows the structure of the error factor determination apparatus 20 concerning 3rd embodiment. It is a figure which shows the state which connected the calibration tool 62 to the output terminal 19a, the mixers 16a and 16b to the terminals 21a and 21b, and the signal generation part 12a to the amplifier 13. It is a figure which shows the state which connected the calibration tool 62 to the output terminal 19a, the mixers 16a and 16b, the terminals 21a and 21b, and the signal generation part 12b to the amplifier 13. It is the figure (FIG. 19 (a), FIG.19 (b)) which represented the error factor determination apparatus 20 of the state shown to FIG. 17 and FIG. 18 with the signal flow graph. It is a figure which shows the example of a structure of the output correction apparatus 1 at the time of using the error factor determination apparatus 20 for the output correction apparatus 1. FIG. It is a figure which shows the example of a structure of the reflection coefficient measurement apparatus 2 at the time of using the error factor determination apparatus 20 for the reflection coefficient measurement apparatus 2. FIG. It is a flowchart which shows operation | movement of the error factor determination apparatus 20 concerning 1st embodiment. It is a flowchart which shows operation | movement of the authenticity determination part 28 of the error factor determination apparatus 20 concerning 1st embodiment. It is a flowchart which shows operation | movement of the error factor determination apparatus 20 concerning 2nd embodiment. It is a flowchart which shows operation | movement of the authenticity determination part 28 of the error factor determination apparatus 20 concerning 2nd embodiment. It is a flowchart which shows operation | movement of the error factor determination apparatus 20 concerning 3rd embodiment. It is a flowchart which shows operation | movement of the authenticity determination part 28 of the error factor determination apparatus 20 concerning 3rd embodiment.

Explanation of symbols

10 Switch branch signal source (signal generation system)
11 switch 100 signal generation system 110 signal source 12, 12a, 12b signal generation unit 13 amplifier 14a, 14b bridge 16a, 16b mixer 18 switch 19a, 19b, 19c, 19d output terminal
Eija (1st port) Error factor (i = 1,2 j = 1,2)
Eijb Second port error factor (i = 1,2 j = 1,2)
Eijc Third port error factor (i = 1,2 j = 1,2)
Eijd 4th port error factor (i = 1,2 j = 1,2)
DESCRIPTION OF SYMBOLS 20 Error factor determination apparatus 22 Error factor recording part 23 Amplification factor derivation part 24 Reflection coefficient derivation part 25 Amplification factor recording part 26 True value input part 28 Truth determination part 29 Amplification factor truth determination part
Xm Derived reflection coefficient
Xam derived reflection coefficient of output terminal 19a
Xbm Derived reflection coefficient of output terminal 19b
Xcm derived reflection coefficient of output terminal 19c
Xdm derived reflection coefficient of output terminal 19d
Xm1, Xm2 Derived reflection coefficient of output terminal 19a
Xt True value of reflection coefficient

Claims (10)

  1. An error factor recording means for recording an error factor in a signal generation system having a signal generation unit for generating a signal and an output terminal for outputting the signal;
    Reflection of the output terminal in which the error due to the error factor is corrected based on the measurement result of the signal in a state where the signal is output from the output terminal and the error factor recorded in the error factor recording means. Reflection coefficient deriving means for deriving a coefficient;
    Authenticity determination means for determining the authenticity of the recorded error factor based on the derived reflection coefficient and the true value of the reflection coefficient;
    An error factor determination device comprising:
  2. The error factor determination device according to claim 1,
    The measurement result of the signal is
    A result of measuring the signal before the error factor occurs;
    Measuring the reflected signal, and
    Having
    Error factor determination device.
  3. The error factor determination device according to claim 1,
    The signal is measured with a calibration tool connected to the output terminal,
    The calibration tool realizes any one of an open state, a short circuit, a standard load, and an arbitrary load.
    Error factor determination device.
  4. The error factor determination device according to claim 1,
    The signal generation system includes an amplifier for amplifying the signal;
    The error factor determination device is
    Amplification factor recording means for recording the amplification factor of the amplifier;
    Amplification factor deriving means for deriving the amplification factor based on the measurement result of the signal in a state where the signal is output from the output terminal and the power of the signal;
    Amplification rate authenticity determination means for determining the authenticity of the recorded amplification rate based on the recorded amplification rate and the derived amplification rate,
    An error factor determination device comprising:
  5. The error factor determination device according to claim 1,
    The true / false determination means makes a recommendation for measurement of the error factor or reports a failure of the signal generation system based on the recorded true / false determination result of the error factor.
    Error factor determination device.
  6. The error factor determination device according to any one of claims 1 to 5,
    Signal power adjusting means for adjusting the power of the signal based on the error factor determined to be true by the authenticity determining means;
    An output correction device comprising:
  7. The error factor determination device according to any one of claims 1 to 5,
    In the state where the device under test is connected to the output terminal, the result of measuring the signal before the error factor occurs, the result of measuring the reflected signal, and the true / false determination means A reflection coefficient measuring means for measuring a reflection coefficient of the object to be measured based on the error factor determined to be;
    A reflection coefficient measuring apparatus.
  8. An error factor recording step of recording an error factor in a signal generation system having a signal generation unit for generating a signal and an output terminal for outputting the signal;
    Reflection of the output terminal in which the error due to the error factor is corrected based on the measurement result of the signal in a state where the signal is output from the output terminal and the error factor recorded by the error factor recording step. A reflection coefficient deriving step for deriving a coefficient;
    A true / false determination step of determining true / false of the recorded error factor based on the derived reflection coefficient and the true value of the reflection coefficient;
    An error factor determination method comprising:
  9. An error factor recording process for recording an error factor in a signal generation system having a signal generation unit for generating a signal and an output terminal for outputting the signal;
    Reflection of the output terminal in which the error due to the error factor is corrected based on the measurement result of the signal in a state where the signal is output from the output terminal and the error factor recorded by the error factor recording process. A reflection coefficient derivation process for deriving a coefficient;
    A true / false determination process for determining true / false of the recorded error factor based on the derived reflection coefficient and a true value of the reflection coefficient;
    A program that causes a computer to execute.
  10. An error factor recording process for recording an error factor in a signal generation system having a signal generation unit for generating a signal and an output terminal for outputting the signal;
    Reflection of the output terminal in which the error due to the error factor is corrected based on the measurement result of the signal in a state where the signal is output from the output terminal and the error factor recorded by the error factor recording process. A reflection coefficient derivation process for deriving a coefficient;
    A true / false determination process for determining true / false of the recorded error factor based on the derived reflection coefficient and a true value of the reflection coefficient;
    A computer-readable recording medium on which a program for causing a computer to execute is recorded.
JP2007273532A 2007-10-22 2007-10-22 Error factor determination device, method, program, output correction apparatus provided with recording medium and the device, and reflection coefficient measuring apparatus Pending JP2008058326A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07198767A (en) * 1993-05-24 1995-08-01 Atn Microwave Inc Electronic calibrating method and apparatus
JPH11211766A (en) * 1998-01-26 1999-08-06 Advantest Corp Automatic calibration device
JP2003344255A (en) * 2002-05-30 2003-12-03 A & D Co Ltd Moisture meter of drying-by-heating type
JP2005233883A (en) * 2004-02-23 2005-09-02 Advantest Corp Network analyzer, network analytical method, program, and recording medium

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07198767A (en) * 1993-05-24 1995-08-01 Atn Microwave Inc Electronic calibrating method and apparatus
JPH11211766A (en) * 1998-01-26 1999-08-06 Advantest Corp Automatic calibration device
JP2003344255A (en) * 2002-05-30 2003-12-03 A & D Co Ltd Moisture meter of drying-by-heating type
JP2005233883A (en) * 2004-02-23 2005-09-02 Advantest Corp Network analyzer, network analytical method, program, and recording medium

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