WO2006059614A1 - Da変換器の試験方法、da変換器の試験装置およびda変換器 - Google Patents
Da変換器の試験方法、da変換器の試験装置およびda変換器 Download PDFInfo
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- WO2006059614A1 WO2006059614A1 PCT/JP2005/021910 JP2005021910W WO2006059614A1 WO 2006059614 A1 WO2006059614 A1 WO 2006059614A1 JP 2005021910 W JP2005021910 W JP 2005021910W WO 2006059614 A1 WO2006059614 A1 WO 2006059614A1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/10—Calibration or testing
- H03M1/1071—Measuring or testing
- H03M1/1085—Measuring or testing using domain transforms, e.g. Fast Fourier Transform
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
Definitions
- the present invention relates to a DA converter test method, a DA converter test apparatus, and a DA converter capable of easily and easily performing a highly accurate operation test for a DA converter, and particularly capable of high-speed operation. It relates to a DA converter test method, a DA converter test apparatus, and a DA converter for the DA converter.
- a DA converter test method for designated countries that are allowed to be incorporated by reference to the literature, the contents described in the following Japanese application are incorporated into this application by reference and made a part of the description of this application.
- a DA converter is a circuit that converts multi-gradation digital data into analog data.
- the test pattern and clock generated by the pattern generator 101 are connected to the DA converter via the cable 102 and the probe 103.
- the analog data input to 104 and output from DA converter 104 was observed by observation device 105 such as an oscilloscope, and the operation of DA converter 104 was confirmed.
- Patent Document 1 Japanese Unexamined Patent Publication No. 2003-133955
- the pattern generator corresponding to the operation speed and the waveform quality of high-speed digital data
- the scale of the device increases, and it takes time to connect the wiring during the operation test, and the cost is high. there were.
- the present invention has been made in view of the above, and a DA converter test method, a DA converter test apparatus, and a DA converter capable of easily and easily performing a highly accurate operation test.
- the purpose is to provide.
- a DA converter test method includes a DA converter that converts predetermined digital data into analog data, and the DA converter. It is characterized by inputting periodic pattern data in which the output waveform of force is symmetric, observing even harmonic components with respect to the fundamental frequency of the periodic pattern data, and testing the DA converter.
- the input of the predetermined digital data is input to the DA converter that converts predetermined digital data into analog data.
- the DA converter test apparatus generates periodic pattern data in which the output waveform from the DA converter that converts predetermined digital data into analog data is symmetric, and the DA conversion It outputs to a container.
- the DA converter test apparatus is input by pattern generation means for generating a test pattern by inputting a test signal and by input of the test signal.
- a selector that converts predetermined digital data into analog data and outputs the test pattern to the DA conversion means side of the test pattern.
- the pattern generation means is provided between the selector and the DA conversion means, and the test signal It is a shift register having a plurality of flip-flop circuits for latching each bit of the predetermined digital data at the time of input, and circulating the latched bit data and outputting it in parallel to the DA conversion means.
- the shift register includes one or more flip-flop circuits coupled to the plurality of flip-flop circuits, and the one or more flip-flop circuits are connected. Each bit is circulated including the bit value set in the flip-flop circuit.
- the clock generation unit generates a clock by the clock generation unit for generating a clock and the input of the test signal.
- Switching means for switching to a clock to be operated, and in the test mode in which the test signal is inputted, the DA conversion means and the pattern generation means operate by the clock.
- the clock generation means is a self-help oscillator, and the frequency of the self-help oscillator is monitored to detect the self-excitation oscillator.
- a frequency control means for controlling the frequency is further provided.
- the pattern data generated by the pattern generating means has a symmetrical waveform output from the DA converting means. It is periodic pattern data.
- the DA converter according to claim 10 is a DA converter for converting predetermined digital data into analog data, and the DA converter test apparatus according to any one of claims 4 to 9. , Provided.
- the DA converter according to claim 11 is a data input terminal for the predetermined digital data, a data output terminal for the analog data, and the test A signal test signal input terminal; and an external clock input terminal for inputting a clock to be supplied to the DA converter and the pattern generator.
- the test method according to claim 12 is a test method for testing a DA converter that converts predetermined digital data into analog data, and includes a waveform in the first half of each cycle and a waveform in the second half of each cycle. Test the DA converter by inputting to the DA converter periodic pattern data whose waveform is approximately the same as the inverted waveform, and observing the even harmonic components of the output waveform from the DA converter with respect to the fundamental frequency. And a step of performing.
- test method according to claim 13 is characterized in that, in the test step, the DA converter is determined to be non-defective when the even-order harmonic component is substantially zero.
- the test apparatus is a test apparatus for testing a DA converter that converts predetermined digital data into analog data, and includes a waveform in the first half of each cycle and a waveform in the second half of each cycle. Periodic pattern data whose waveform is almost the same as the inverted waveform is input to the DA converter, and even harmonic components of the fundamental frequency of the output waveform from the DA converter are observed for DA conversion. And a test section for testing the vessel.
- test apparatus is characterized in that the test unit determines that the DA converter is a non-defective product when the even-order harmonic component is substantially zero.
- the pattern generation unit includes a shift register that generates periodic pattern data based on the given pattern data, and the shift register determines the number of bits of the pattern data. It has a corresponding number of registers connected in a loop, latches the corresponding bit data of each register power pattern data, and the latched bit data is sent to the register of the next stage according to the given clock.
- the shift register power is characterized in that the data that each register sequentially outputs according to the clock is output as each bit data of the periodic pattern data.
- the pattern data in which at least one of the bit indicating the H logic value and the bit indicating the L logic value is continuous by half the total number of bits is a shift register.
- a control unit that supplies a test signal for starting the output of the periodic pattern data to the shift register, at least on the condition that the input to the shift register.
- the shift register further includes one or more setting flip-flops inserted between any two of the plurality of flip-flops.
- the flip-flop stores a predetermined setting value.
- test apparatus in the control unit, in the pattern data and the set value, at least one of the bit indicating the H logic value and the bit indicating the L logic value is half the total number of bits.
- a test signal for starting the output of the periodic pattern data is supplied to the shift register, at least on the condition that each bit is continuous.
- test apparatus includes clock generation means for generating an internal clock, and switching means for switching the clock to be supplied to the flip-flop from the external clock to the internal clock based on the test signal. It is further provided with the feature.
- the test apparatus according to claim 21 is characterized in that the clock generation means generates an internal clock having a frequency higher than that of the external clock.
- an output waveform of the DA converter force is applied to the DA converter that converts predetermined digital data into analog data. Is input, and the even-order harmonic component is observed with respect to the fundamental frequency of the periodic pattern data. If the even-order harmonic component is not observed, the DA converter is operating normally. As a result, a highly accurate DA converter test can be easily and easily performed.
- FIG. 1 is a diagram showing an outline of a DA converter test method according to a first embodiment of the present invention.
- FIG. 3 is a block diagram showing a configuration of a DA converter incorporating the data selection circuit shown in FIG.
- FIG. 5 is a block diagram showing a configuration of a DA converter incorporating the data selection circuit shown in FIG.
- FIG. 7 A block diagram showing a configuration of a data selection circuit which is a modification of the second embodiment of the present invention.
- FIG. 8 is a diagram showing an output waveform of analog data in the test mode by the DA converter shown in FIG.
- FIG. 10 is a waveform diagram when the clock frequency is changed between the normal mode and the test mode by the DA converter shown in FIG.
- FIG. 11 A block diagram showing a configuration of a DA converter according to the fourth embodiment of the present invention. 12] This is a diagram showing the system configuration when performing an operation test on a conventional DA converter.
- VCO 6a VCO 6b, 20b divider
- FIG. 1 is a diagram showing a concept of a test method for a DA converter according to the first embodiment of the present invention.
- this DA converter test method shows the periodic data that circulates bit by bit as shown in the upper part of Fig. 1 when the DA converter (not shown) first converts 4-bit digital data to analog data. No Input to DA converter.
- cyclic means that the bit value strength of each bit changes to the upper bit and the highest bit value strength changes to the least significant bit.
- the cycle data is “0011” ⁇ “0110” ⁇ “1100” ⁇ “1001” ⁇ “0011” ⁇ .
- cyclic means that the bit value of each bit changes to the lower bit and the lowest bit value. , Transition may be made to the most significant bit.
- this periodic data When this periodic data is input to a DA converter (not shown), it is converted to analog data shown in the middle of FIG. 1 and output.
- the waveform of this analog data is symmetrical with respect to the analog value “7.5”.
- the upper and lower areas SA and SB are equal based on the analog borrowing of “7.5”.
- the digital data input to the DA converter (not shown) is the periodic data that generates the symmetric waveform described above, as shown in the lower part of FIG. 1, the fundamental wave S P1 (frequency f ) And harmonics SP2 to SP5 (2f to 5f) are output. 6th and later
- the normal operation of the DA converter means that the voltage value of each gradation at the time of DA conversion is operating properly. Therefore, the periodic data that generates the symmetric waveform described above is input to a DA converter (not shown), and the output waveform is observed using an observation device such as a spectrum analyzer, and whether or not even-order harmonics SP2 and SP4 appear. Alternatively, an operational test of a DA converter (not shown) can be performed based on that level.
- the data values of the digital data input to the DA converter have the same number of bits indicating the H logic value and the bits indicating the L logic value. For example, as shown in the upper part of Fig. 1, if each data value bit of digital data is H logic It is preferable that the bit indicating the value and the bit indicating the L logic value are two bits each.
- each data value of the digital data input to the DA converter is continuous at least one of the bit indicating the H logic value and the bit indicating the L logic value, which is half the total number of bits. It is preferable.
- the digital data shown in the upper part of FIG. 1 is the data value S4 bit of each digital data.
- at least one of the bit indicating the H logic value and the bit indicating the L logic value exists continuously for 2 bits.
- FIG. 2 is a diagram showing a configuration of a DA converter test apparatus that realizes the above-described DA converter test method.
- the test apparatus includes a data selection circuit 1 and a test unit 13.
- the data selection circuit 1 shown in FIG. 2 functions as a signal input means for a DA converter (DAC) that converts 4-bit digital data into analog data, and is arranged in the preceding stage of the DA converter.
- DAC DA converter
- the data selection circuit 1 includes a selector 2 and a pattern generator 3.
- the selector 2 receives 4-bit digital data D0 to D3, and the digital data D0 to D3 are input to the selector circuits SL0 to SL3, respectively.
- the pattern generation unit 3 has a memory 3a, in which a test pattern that is periodic data for generating the above-described symmetrical waveform is stored, and this test pattern is stored in the corresponding selector circuits SL0 to SL3. input.
- Each of the selector circuits SL0 to SL3 receives a test signal TEST, and when the test signal TEST is at a low level, the input digital data D0 to D3 is directly output to the DA converter (DAC) as output data O0 to ⁇ 3.
- DAC DA converter
- test pattern output from the pattern generator 3 is output to the DA converter (DAC) as output data 0 to O3 Switch to.
- the pattern generation unit 3 is operated by the supplied clock signal CLK.
- the test unit 13 determines the quality of the DA converter (DAC) by observing an even-order harmonic component with respect to the fundamental frequency of the output waveform from the DA converter (DAC). For example, the test unit 13 may determine that the DA converter is a non-defective product when the even-order harmonic component of the output waveform of the DA converter (DAC) is substantially zero.
- the test unit 13 has means for converting the output waveform of the DA converter (DAC) into a signal in the frequency domain.
- FIG. 3 is a diagram showing a configuration of a DA converter 10 that includes the data selection circuit 1 described above and a DA converter 4 that functions as a DA converter. That is, the DA converter 10 realizes the DA converter 4 and the data selection circuit 1 as one device.
- the DA converter 10 includes a data input terminal T1 for inputting 4-bit digital data D0 to D3 to be DA-converted, and a test mode setting input terminal for inputting a test signal TEST.
- T1 for inputting 4-bit digital data D0 to D3 to be DA-converted
- TEST for inputting a test signal
- T2 has a data selection circuit 1 and a DA converter 4 inside.
- the DA converter 10 has an analog output terminal T4 for outputting the analog data OUT converted by the DA converter 4 to the outside.
- the data selection circuit 1 has the digital data D0 to D3 input from the data input terminal T1, the test signal TEST input from the test mode setting input terminal T2, and the input from the clock input terminal T3.
- the clock signal CLK thus input is input.
- the clock signal CLK is also supplied to the DA converter 4 and the digital data 0 to O3 output from the data selection circuit 1 are input.
- the DA conversion unit 4 converts the digital data 0 to O3 into analog data OUT using the clock signal CLK as an operation clock, and outputs the analog data OUT via the analog output terminal T4.
- the DA converter 10 described above does not need to be formed by one chip, but has a data input terminal Tl, a test mode setting input terminal ⁇ 2, a clock input terminal ⁇ 3, and an analog output terminal ⁇ 4. Les, preferably formed as one chip. This is because by using one chip, waveform deterioration and loss due to wiring can be eliminated, and wiring for performing high-speed operation tests can be easily formed.
- the DA converter 10 is tested as a chip that functions as a normal DA converter at the time of shipment or maintenance, for example, by switching to the test mode. As a result, it is possible to eliminate the waveform deterioration and loss due to wiring during the test, and to perform a highly accurate test.
- the digital data D0 to D3 are 4-bit multi-gradation data.
- the present invention is not limited to this, and the number of parallel bits is arbitrary.
- 8-bit parallel data Alternatively, 16-bit parallel data may be used.
- the force that the pattern generating unit 3 generates the test pattern is generated using the input digital data D0 to D3. Yes.
- FIG. 4 shows a detailed configuration of data selection circuit 1 according to the second embodiment of the present invention.
- FIG. 5 is a diagram showing a schematic configuration of the DA converter 11 in which the data selection circuit 2 is mounted. 4 and 5, the data selection circuit 1 is provided with a shift register 31 having a number of stages corresponding to the number of bits in place of the pattern generation unit 3.
- the shift register 31 is provided between the selector 2 and the DA conversion unit 4, for example.
- the shift register 31 generates periodic pattern data based on the given pattern data.
- the shift register 31 has a plurality of registers (flip-flop circuits FF0 to FF3) connected in a nor- ber manner corresponding to the number of bits of pattern data to be applied.
- Each selector circuit SL0 to SL3 is input with digital data DO, Dl, D2, D3, and output data ⁇ 3, 00, O1, ⁇ 2 which are outputs of flip-flop circuits FF3, FFO, FF1, FF2, respectively.
- the digital data D0 to D3 or the output data 03 to 02 selected by the input test signal TEST are input to the flip-flop circuits FF0 to FF3, respectively.
- Each flip-flop circuit FF0 to FF3 latches the data input from each selector circuit SL0 to SL3, and outputs it to the DA converter 4 as output data 0 to 03.
- the flip-flop circuits FF0 to FF3 latch the input digital data D0 to D3, and then output data O0 to ⁇ 3 as they are in accordance with the clock signal CLK. Output as.
- the flip-flop circuits FF0 to FF3 are Digital data D0 to D3 when the test signal TEST goes high is latched, and then a shift register is formed to shift each latched bit value according to the clock signal CLK. Output data ⁇ 0 to ⁇ 3, which is parallel data, from the FF circuits FF0 to FF3 according to the clock signal CLK.
- D3 parallel data DT0, DTI, DT2, DT3 are output as output data ⁇ 0, ⁇ 1, ⁇ 2, 03, respectively, and the next flip-flop circuit FF1, FF2, FF3, Shifted to FFO.
- output data 00 is the cyclic data from DT0 ⁇ DT3 ⁇ DT2 ⁇ DT1 ⁇ DT0 ⁇ DT3 ⁇ ... from the time tl when the test signal TEST goes high. Therefore, the output data ⁇ 1 becomes cyclic data of DT1 ⁇ DT0 ⁇ DT3 ⁇ DT2 ⁇ DT1 ⁇ DT0 ⁇ ... from the time tl when the test signal TEST becomes high level. That is, when the test signal TEST is at a high level, each of the flip-flop circuits FF0 to FF3 sequentially transfers the latched digital data to the next flip-flops FF0 to FF3 according to a given clock.
- the output data O0 to ⁇ 3 is the parallel data DTC! ⁇ DT3 “1, 1, 0, 0” is sequentially output as circulating parallel data, which becomes the test pattern.
- the test data output data 0 to O3 is then converted into analog values according to the respective gradations by the DA converter 4 and output as analog data OUT.
- the digital data DT0 to DT3 latched by the shift register 3 at the time of transition to the test mode is then cyclically shifted to generate parallel output data O0 to O3 as a test pattern. Therefore, it is possible to easily form a high-speed desired test pattern.
- the flip-flop circuit forming the shift register 31 is used.
- Path power of FF0 to FF3 The same power as the number of bits of digital data D0 to D3 Not limited to this, the number of stages of the flip-flop circuit may be a number exceeding the number of bits of digital data D0 to D3. .
- the test apparatus further includes a control unit 14 for inputting the test signal TEST to the data selection circuit 1.
- the control unit 14 has at least a condition that at least one of the bit indicating the H logic value and the bit indicating the L logic value is input to the shift register in which the pattern data is continuous by half of the total number of bits.
- the test signal for starting the output of the periodic pattern data is supplied to the selector 2.
- the control unit 14 may start outputting the periodic pattern data when the above condition is satisfied after receiving a notification that the DA converter (DAC) test is started. Further, the control unit 14 may output a test signal TEST according to a test program for controlling the test apparatus.
- DAC DA converter
- FIG. 7 is a diagram showing a detailed configuration of data selection circuit 21 according to the second embodiment of the present invention.
- the data selection circuit 21 further includes one or more setting flip-flops (flip-flop circuits FF4 and FF5) in addition to the configuration of the data selection circuit 1 shown in FIG.
- the flip-flop circuits FF4 and FF5 are inserted between any two flip-flop circuits FF0 to FF3 among the plurality of flip-flop circuits FF0 to FF3 included in the shift register 32.
- the shift register 32 of the data selection circuit 21 has a configuration in which two stages of flip-flop circuits FF4 and FF5 are connected to the preceding stage. .
- the output data 03 of the flip-flop circuit FF3 is input to the flip-flop circuit FF4, and the output data of the flip-flop circuit FF5 is input to the selector circuit SL0. Input to circuit FF0.
- Other configurations are the same as those of the data selection circuit 1 shown in FIG. 4 and the DA converter 10 shown in FIG. 5, and the same components are denoted by the same reference numerals.
- the flip-flops FF0 to FF3 latch the digital data D0 to D3 when the test signal TEST goes high. Also, predetermined setting values are stored in the flip-flop circuits FF4 and FF5. As a result, in addition to the data latched by the flip-flop circuits FF0 to FF3, the first flip-flop circuits FF4 and FF5 The set bit is cyclically shifted.
- FIG. 8 is a diagram showing an example of output data O0 to O3 in the test mode by the data selection circuit 21 shown in FIG. As shown in Fig. 8, by adding flip-flop circuits FF4 and FF5, the cycle of the test pattern that circulates becomes longer, and various test patterns can be generated accordingly. In particular, since bits are added by the flip-flop circuits FF4 and FF5, as shown in the lower part of FIG. 8, it is easy to generate a symmetrical waveform having the same areas Sa and Sb, and an operation test for the DA converter 4 is performed. Can be done easily and diversely
- the power to realize a six-stage shift register 32 to which two-stage flip-flop circuits FF4 and FF5 are added is not limited to this.
- One stage or three stages The above flip-flop circuit may be added.
- the flip-flop circuits FF4 and FF5 are arranged between the flip-flop circuits FF1 and FF2, for example, so that various test patterns can be generated.
- the force that is uniformly shifted to the upper bit side of the digital data DO to D3 and circulated is not limited to this, but each flip-flop It is also possible to form a shift register with different shift destinations by, for example, partially crossing the shift destinations of the circuits FF0 to FF5 in the adjacent flip-flop circuit in the subsequent stage to generate various test patterns. ,.
- the data selection circuit 21 may further include a control unit that supplies the test signal TEST, similarly to the data selection circuit 21 shown in FIG. In the pattern data and setting values stored in the flip-flop circuits FF 0 to FF5, the control unit continuously applies at least one of the bit indicating the H logic value and the bit indicating the L logic value, which is half the total number of bits.
- the test signal TEST that starts the output of the periodic pattern data may be supplied to the data selection circuit 21 on the condition that it is at least a condition.
- FIG. 9 is a diagram showing a schematic configuration of a DA converter according to Embodiment 3 of the present invention.
- this DA The converter 12 has a clock selection circuit 5 and a clock generation circuit 6 inside the DA converter 11 shown in FIG.
- the test signal TEST is input to the data selection circuit 1 and also to the clock selection circuit 5.
- the clock selection circuit 5 receives the external clock signal CLKA input from the clock input terminal T3 and the internal clock signal CLKB output from the clock generation circuit 6 which is a self-excited oscillator, and the test signal TEST is at the low level.
- the external clock signal CLKA is selected, and when the test signal TEST is at the high level, the internal clock signal CLKB is selected, and the selected signal is set as the clock signal CLK, and the data selection circuit 1 and the DA converter 4 Output to.
- This clock signal CLK is used as an operation clock for the data selection circuit 1 and the DA converter 4.
- the DA converter 4 analog-converts the output data 0 to O3 as 4-bit multi-gradation data, and outputs the analog data OUT from the analog output terminal T4.
- the DA converter 4 has an operation speed determined by the clock signal CLK, and operates at the clock speed of the external clock CLKA in the normal mode, and operates at the clock speed of the internal clock CLKB in the test mode.
- the clock signal CLK is switched from the external clock signal CLKA to the internal clock signal CLKB by the clock selection circuit 5 when the test signal TEST becomes high level.
- the clock frequency of the internal clock signal CLKB in the test mode is set high in order to test the high-speed operation of the DA converter 4, but since the DA converter 12 is built in, the internal clock signal CLKB is The clock is supplied to the data selection circuit 1 and DA converter 4 as a sufficient clock for high-speed operation tests with little waveform degradation.
- the external clock signal CLKA is supplied to the data selection circuit 1 and the DA conversion unit 4, so when performing an operation test of the DA conversion unit 4, the clock frequency in the normal mode is lowered. can do. That is, an external clock signal CLKA having a low clock frequency can be input from the clock input terminal T3.
- the test signal TEST becomes high level
- the digital data D0 to D3 are latched, and the latched parallel data DT0 to DT3 are tested.
- the clock frequency of the external clock signal CLKA can be reduced to ensure that the desired test pattern can be selected reliably and stably using the test signal TEST. .
- DA converter 12 since DA converter 12 includes shift register 31 and clock generator 6 that function as a test pattern generator, it is possible to easily perform signal generation while maintaining high speed. This eliminates the need for expensive pattern generators, cables, and probes, and allows the DA converter 4 to perform a high-speed operation test easily and easily.
- the clock generation circuit 6 is a self-excited oscillator.
- the self-excited oscillator is increased in stability.
- FIG. 11 is a block diagram showing a configuration of a DA converter according to Embodiment 4 of the present invention.
- the clock generation circuit 6 of the DA converter 12 has VC06a and outputs an internal clock signal CLKB from VC06a.
- the clock generation circuit 6 feeds back the output of VC06a through the frequency divider 6b.
- the DA converter 12 further includes a test clock output terminal T6 for outputting a monitor signal from the frequency divider 6b of the clock generation circuit 6 and a test clock input for inputting a control signal for controlling the frequency of the VC06a voltage.
- a frequency controller 20 is connected to the DA converter 12 via a test clock input terminal T5 and a test clock output terminal T6.
- Other configurations are the same as those shown in FIG. 9, and the same components are denoted by the same reference numerals.
- the frequency controller 20 has an original oscillator 20c realized by a crystal oscillator or the like, and the phase comparator 20a separates the signal from the original oscillator 20c from the signal input via the frequency divider 20b.
- the frequency of VC06a is voltage controlled by phase comparison with the signal monitored by frequency divider 6b. This realizes a so-called PLL circuit that stabilizes the clock frequency of VC06a.
- the frequency controller 20 is not necessarily provided with the original oscillator 20c and the frequency divider 20b as long as the internal clock frequency of the clock generation circuit 6 can be stabilized.
- an external frequency controller 20 is provided and a test clock input terminal T5 Since the internal clock frequency generated by the clock generation circuit 6 is feedback-controlled via the test clock output terminal T6, the internal clock frequency can be stabilized.
- the DA converter that converts predetermined digital data into analog data has a symmetrical output waveform of the DA converter force.
- the periodic pattern data is input, the even harmonic components with respect to the fundamental frequency of the periodic pattern data are observed, and if the even harmonic components are not observed, it is determined that the DA converter is operating normally. Therefore, it is possible to easily and easily test a high-accuracy DA converter.
Abstract
Description
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JP2004-348959 | 2004-12-01 | ||
JP2004348959A JP2008047944A (ja) | 2004-12-01 | 2004-12-01 | Da変換器の試験方法、da変換器の試験装置およびda変換器 |
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US (1) | US20060116834A1 (ja) |
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CN109030938A (zh) * | 2017-06-08 | 2018-12-18 | 许继集团有限公司 | 一种基于正弦滤波的抗谐波测频方法和装置 |
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US7502980B2 (en) * | 2006-08-24 | 2009-03-10 | Advantest Corporation | Signal generator, test apparatus, and circuit device |
JP6177763B2 (ja) * | 2011-08-19 | 2017-08-09 | 日本碍子株式会社 | 蓄電池の制御方法、蓄電池の制御装置及び電力制御システム |
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JPH06181433A (ja) * | 1992-12-12 | 1994-06-28 | Yokogawa Hewlett Packard Ltd | アナログ−ディジタルコンバータのsn比測定方法 |
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US5475315A (en) * | 1991-09-20 | 1995-12-12 | Audio Precision, Inc. | Method and apparatus for fast response and distortion measurement |
US5537479A (en) * | 1994-04-29 | 1996-07-16 | Miller And Kreisel Sound Corp. | Dual-driver bass speaker with acoustic reduction of out-of-phase and electronic reduction of in-phase distortion harmonics |
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2004
- 2004-12-01 JP JP2004348959A patent/JP2008047944A/ja not_active Withdrawn
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2005
- 2005-01-31 US US11/045,493 patent/US20060116834A1/en not_active Abandoned
- 2005-11-29 WO PCT/JP2005/021910 patent/WO2006059614A1/ja not_active Application Discontinuation
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JPH06181433A (ja) * | 1992-12-12 | 1994-06-28 | Yokogawa Hewlett Packard Ltd | アナログ−ディジタルコンバータのsn比測定方法 |
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CN109030938A (zh) * | 2017-06-08 | 2018-12-18 | 许继集团有限公司 | 一种基于正弦滤波的抗谐波测频方法和装置 |
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US20060116834A1 (en) | 2006-06-01 |
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