WO2006006354A1 - 遅延量測定方法 - Google Patents
遅延量測定方法 Download PDFInfo
- Publication number
- WO2006006354A1 WO2006006354A1 PCT/JP2005/011439 JP2005011439W WO2006006354A1 WO 2006006354 A1 WO2006006354 A1 WO 2006006354A1 JP 2005011439 W JP2005011439 W JP 2005011439W WO 2006006354 A1 WO2006006354 A1 WO 2006006354A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- output signal
- delay amount
- input signal
- electronic device
- digital data
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/317—Testing of digital circuits
- G01R31/31725—Timing aspects, e.g. clock distribution, skew, propagation delay
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/30—Marginal testing, e.g. by varying supply voltage
- G01R31/3016—Delay or race condition test, e.g. race hazard test
Definitions
- the present invention relates to a delay amount measuring method for measuring a delay amount in an electronic device that outputs an output signal according to an input signal.
- the present invention also relates to the following Japanese patent application. For designated countries where incorporation by reference is permitted, the contents described in the following application are incorporated into this application by reference and made a part of the description of this application.
- a method for measuring a delay time using a cross-correlation function between an input waveform and an output waveform is known. This method calculates the cross-correlation function by Fourier transforming each of the input waveform and output waveform. Then, the phase characteristic of the cross-correlation function is unwrapped to obtain a linear characteristic, and the gradient force delay time of the characteristic is calculated.
- the cross-correlation function cannot be accurately calculated, and the delay time in the amplifier or the like cannot be accurately calculated. Also, if the input waveform is a discontinuous waveform in the frequency axis direction, such as a multi-tone signal, it will be discontinuous even if the phase characteristics of the cross-correlation function are unwrapped. It cannot be calculated.
- an object of the present invention is to provide a delay amount measuring method that can solve the above-described problems. This object is achieved by a combination of features described in the independent claims.
- the dependent claims define further advantageous specific examples of the present invention.
- the present invention provides a delay amount measuring method for measuring a delay amount in an electronic device that outputs an output signal in accordance with an input signal, wherein the input signal and the output signal are converted into digital data. Shifting the square error between the digital data of the input signal and the digital data of the output signal, and the shift stage of sequentially shifting the digital data of V or deviation of the input signal or output signal in the time direction An error calculation stage for each of the shift amounts in the stage, a shift amount at which the square error becomes a minimum value is calculated by the nonlinear least square method, and the calculated shift amount is a delay amount in the electronic device.
- a delay amount measuring method comprising: a quantity calculating step.
- the delay amount in the electronic device can be calculated accurately without depending on the waveform of the output signal.
- FIG. 1 is a diagram showing an example of the configuration of a measuring apparatus 100 according to an embodiment of the present invention.
- FIG. 2 is a flowchart showing an example of a delay amount measuring method for measuring a delay amount in electronic device 200.
- FIG. 3 is a diagram showing an example of waveforms of an input signal and an output signal.
- FIG. 4 is a graph showing the square error calculated for each shift amount.
- FIG. 5 is a flowchart showing another example of a delay amount measuring method.
- FIG. 6 is a flowchart showing an example of a nonlinear characteristic calculation method for calculating nonlinear characteristics of the electronic device 200.
- FIG. 1 is a diagram showing an example of the configuration of a measuring apparatus 100 according to an embodiment of the present invention.
- the measuring device 100 is a device that measures nonlinear characteristics of an electronic device 200 such as an amplifier.
- ADC20 analog-digital converter 20
- a memory 30, and a calculation unit 40 are included in the calculation unit 40 .
- the measuring apparatus 100 stores an input signal to be input to the electronic device 200 and an output signal output from the electronic device 200 in the memory 30 in order to measure nonlinear characteristics of the electronic device 200.
- the signal generator 10 generates an input signal to be input to the electronic device 200.
- the switch 12 switches whether the electronic device 200 or the ADC 20 is connected to the signal generator 10. When the input signal is stored in the memory 30, the switch 12 connects the ADC 20 to the signal generator 10. When storing an output signal in the memory 30, the switch 12 connects the electronic device 200 to the signal generator 10 and inputs an input signal to the electronic device 200.
- the ADC 20 converts an applied analog signal into a digital signal.
- the switch 14 switches whether the electronic device 200 or the signal generator 10 is connected to the ADC20. When storing the input signal in the memory 30, the switch 14 connects the signal generator 10 to the ADC 20 and stores the input signal in the memory 30 via the ADC 20. When storing the output signal in the memory 30, the switch 14 connects the electronic device 200 to the ADC 20 and stores the output signal in the memory 30 via the ADC 20.
- the arithmetic unit 40 is based on an input signal and an output signal stored in the memory 30 and an electronic device. Calculate the signal delay time in the chair 200, correct the phase difference between the input signal and output signal based on the delay time, and based on the input signal and output signal corrected phase difference! Then, the nonlinear characteristic of the electronic device 200 is calculated. Next, a method for measuring the delay time in the electronic device 200 based on the input signal and the output signal will be described.
- FIG. 2 is a flowchart illustrating an example of a delay amount measuring method for measuring a delay amount in the electronic device 200.
- the ADC 20 converts the input signal and output signal of the electronic device 200 into digital data and stores it in the memory 30 (S300).
- the digital data of the output signal is sequentially shifted in the time direction (S302).
- the digital data of the input signal may be sequentially shifted in the time direction.
- the shift amount for sequentially shifting the digital data is predetermined according to the measured! / And the accuracy of the delay time.
- Meas (k, ⁇ ) indicates the kth data of the digital data of the output signal when the output signal is phase shifted by ⁇
- Ref (k) is the kth data of the digital data of the input signal.
- N represents the number of data of the input signal and output signal.
- the shift amount ⁇ of the output signal may be an integral multiple of the sampling period of ADC20.
- the arithmetic unit 40 can easily obtain the shift data by shifting the digital data of the output signal one by one in the time direction.
- the arithmetic unit 40 performs a discrete Fourier transform on the digital data of the output signal to convert it into a complex signal in the frequency domain, and the frequency The phase of the complex signal in the region is shifted according to the shift amount, and the phase The shift data may be calculated by performing an inverse discrete Fourier transform on the complex signal in the frequency domain to which the signal is shifted and converting it into a signal in the time domain.
- the square error calculated for each shift amount ⁇ is approximated by a non-linear least square method to calculate a minimum value of the square error (S306). Then, the shift amount at which the square error becomes the minimum value is calculated as the phase difference between the input signal and the output signal, that is, the delay amount in the electronic device 200 (S308).
- the delay amount in the electronic device 200 can be calculated. Further, according to the delay amount measuring method in this example, even when the output signal is distorted due to the non-linearity of the electronic device 200, the delay amount is accurately calculated without depending on the waveform of the output signal. be able to.
- FIG. 3 is a diagram showing an example of the waveforms of the input signal and the output signal.
- the input signal is shown as a solid line waveform
- the output signal is shown as a wavy line waveform.
- FIG. 4 is a graph showing the square error calculated for each shift amount.
- the horizontal axis shows the shift amount
- the vertical axis shows the square error.
- the square error can be accurately approximated by a quadratic curve.
- FIG. 5 is a flowchart showing another example of the delay amount measuring method.
- the ADC 20 converts the input signal and output signal of the electronic device 200 into digital data and stores it in the memory 30 (S300).
- the shift amount for sequentially shifting the phase of the output signal is determined (S3 Ten).
- the digital data of the output signal is sequentially shifted by the shift amount in the time direction (S302).
- the square error between the digital data of the output signal shifted to S302 and the digital data of the input signal is calculated (S304).
- the square error calculated for each shift amount is approximated by the nonlinear least square method to calculate the minimum value of the square error (S306).
- the phase difference between the input signal and the output signal can be calculated with the resolution of the shift amount set in S310.
- the operations from S310 to S306 are repeated a plurality of times while the shift amount set in S310 is reduced.
- the phase difference between the input signal and the output signal is calculated while reducing the resolution.
- the shift amount set in S310 is calculated to be the same as the sampling period of ADC20
- the shift amount set in S310 is calculated as ADC20 It is calculated as ⁇ of the sampling period.
- the phase of the output signal is shifted only around the shift amount calculated in the first S306, at which the square error becomes the minimum value.
- the output signal is shifted by the resolution set in S310 before and after the shift amount calculated in the first S306.
- Such an operation is repeated a plurality of times to accurately calculate the phase difference between the input signal and the output signal.
- the number of loops indicating how many times the operations from S310 to S306 are repeated may be determined in advance according to the accuracy of the delay amount to be calculated. Then, after performing the operations of the loop counts S310 to S306, the shift amount calculated in the last S306 is calculated as the delay amount in the electronic device 200 (S308).
- the digital data of the input signal and the digital signal of the output signal are changed.
- the phase difference between the input signal and the output signal may be calculated with the resolution of the ADC20 sampling period. That is, the calculation unit 40 may calculate the phase at which the cross-correlation function takes a peak value as the phase difference between the input signal and the output signal at the resolution of the sampling period of the ADC 20.
- FIG. 6 is a flowchart showing an example of a nonlinear characteristic calculation method for calculating the nonlinear characteristic of the electronic device 200.
- the electronic device 2 The nonlinear characteristic of 00 is calculated, and a predistortion waveform for correcting distortion of the output signal due to the nonlinear characteristic is generated.
- the predistortion waveform is a waveform for giving distortion corresponding to the nonlinear characteristic of the electronic device 200 to an input signal input to the electronic device 200 such as an amplifier in advance. In other words, the distortion caused by the nonlinear characteristics of the electronic device 200 can be canceled by superimposing the predistortion waveform on the input signal.
- the delay amount in the electronic device 200 is measured (S400).
- S400 measures the delay amount by the delay amount measuring method described in relation to FIG. 2 or FIG. Further, in S400, the phase of the output signal or the input signal is shifted based on the calculated delay amount, and the influence of the delay amount in the electronic device 200 is canceled.
- the imbalance between the orthogonal components of the I component and the Q component is corrected (S402).
- AM-AM conversion characteristics in the electronic device 200 are calculated (S404).
- the AM-AM conversion characteristic is a gain characteristic in the electronic device 200 that changes according to the level of the input signal, for example.
- the arithmetic unit 40 stores the AM-AM conversion characteristics calculated in S404. Then, the AM-AM conversion characteristic is corrected (S406).
- the AM-PM conversion characteristic of the electronic device 200 is calculated based on the corrected input signal and output signal data (S408).
- the AM-PM conversion characteristic is a characteristic of the phase of the output signal that changes according to the level of the input signal, for example.
- the arithmetic unit 40 stores the AM-PM conversion characteristic calculated in S406. Then, the AM-PM conversion characteristic is corrected (S410). Then, based on the AM-AM conversion characteristic and AM-PM conversion characteristic stored by the calculation unit 40, a predistortion waveform is generated (S412).
- the influence of the delay amount in the electronic device 200 can be corrected with high accuracy, so that the nonlinear characteristic of the electronic device 200 can be calculated with high accuracy.
- the delay amount in the electronic device can be calculated accurately without depending on the waveform of the output signal. can do.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Tests Of Electronic Circuits (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Measurement Of Unknown Time Intervals (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112005001590T DE112005001590T5 (de) | 2004-07-12 | 2005-06-22 | Verzögerungsmessverfahren |
US11/251,600 US7197413B2 (en) | 2004-07-12 | 2005-10-25 | Delay amount measurement method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-205178 | 2004-07-12 | ||
JP2004205178A JP4526891B2 (ja) | 2004-07-12 | 2004-07-12 | 遅延量測定方法、及び測定装置 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/251,600 Continuation US7197413B2 (en) | 2004-07-12 | 2005-10-25 | Delay amount measurement method |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006006354A1 true WO2006006354A1 (ja) | 2006-01-19 |
Family
ID=35783703
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/011439 WO2006006354A1 (ja) | 2004-07-12 | 2005-06-22 | 遅延量測定方法 |
Country Status (4)
Country | Link |
---|---|
US (1) | US7197413B2 (ja) |
JP (1) | JP4526891B2 (ja) |
DE (1) | DE112005001590T5 (ja) |
WO (1) | WO2006006354A1 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5119016B2 (ja) * | 2008-03-14 | 2013-01-16 | 株式会社リコー | ベルト駆動制御装置及び画像形成装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6214525A (ja) * | 1985-07-11 | 1987-01-23 | Yokogawa Hewlett Packard Ltd | タイミング較正方法 |
JP2002040099A (ja) * | 2000-07-24 | 2002-02-06 | Advantest Corp | 近似波形生成方法及び半導体試験装置 |
JP2003014786A (ja) * | 2001-06-27 | 2003-01-15 | Iwatsu Electric Co Ltd | トリガ信号生成装置 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2589864B2 (ja) * | 1990-09-11 | 1997-03-12 | 松下電器産業株式会社 | 信号比較装置 |
-
2004
- 2004-07-12 JP JP2004205178A patent/JP4526891B2/ja not_active Expired - Fee Related
-
2005
- 2005-06-22 DE DE112005001590T patent/DE112005001590T5/de not_active Withdrawn
- 2005-06-22 WO PCT/JP2005/011439 patent/WO2006006354A1/ja active Application Filing
- 2005-10-25 US US11/251,600 patent/US7197413B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6214525A (ja) * | 1985-07-11 | 1987-01-23 | Yokogawa Hewlett Packard Ltd | タイミング較正方法 |
JP2002040099A (ja) * | 2000-07-24 | 2002-02-06 | Advantest Corp | 近似波形生成方法及び半導体試験装置 |
JP2003014786A (ja) * | 2001-06-27 | 2003-01-15 | Iwatsu Electric Co Ltd | トリガ信号生成装置 |
Also Published As
Publication number | Publication date |
---|---|
JP2006029826A (ja) | 2006-02-02 |
JP4526891B2 (ja) | 2010-08-18 |
US7197413B2 (en) | 2007-03-27 |
DE112005001590T5 (de) | 2007-05-31 |
US20060161383A1 (en) | 2006-07-20 |
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