WO2007122950A1 - 半導体装置、半導体試験装置、及び半導体装置の試験方法 - Google Patents
半導体装置、半導体試験装置、及び半導体装置の試験方法 Download PDFInfo
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- WO2007122950A1 WO2007122950A1 PCT/JP2007/055796 JP2007055796W WO2007122950A1 WO 2007122950 A1 WO2007122950 A1 WO 2007122950A1 JP 2007055796 W JP2007055796 W JP 2007055796W WO 2007122950 A1 WO2007122950 A1 WO 2007122950A1
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- 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
- G01R31/3181—Functional testing
- G01R31/319—Tester hardware, i.e. output processing circuits
- G01R31/3193—Tester hardware, i.e. output processing circuits with comparison between actual response and known fault free response
- G01R31/31932—Comparators
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- 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
- G01R31/3167—Testing of combined analog and digital circuits
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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
- H03M1/1076—Detection or location of converter hardware failure, e.g. power supply failure, open or short circuit
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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
- H03M1/109—Measuring or testing for dc performance, i.e. static testing
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/1205—Multiplexed conversion systems
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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 semiconductor device, a semiconductor test device, and a test method for a semiconductor device, a semiconductor device provided with a digital-analog converter (hereinafter referred to as DAC), and a semiconductor test device that performs the test
- DAC digital-analog converter
- the present invention relates to an improvement in a test method of a semiconductor device, and more particularly, to a semiconductor device having a plurality of DACs, which can be easily tested.
- the test time tends to be longer if the number of mounted DACs is large or the resolution is high (the resolution is large).
- Patent Document 1 and Patent Document 2 that is a publication thereof, the comparison of three or more DACs is performed using a comparator, and the comparison result is obtained. There is a method to make a judgment.
- Patent Document 1 Japanese Patent Publication No. 64-9771
- Patent Document 2 Japanese Patent Laid-Open No. 61-16624
- Patent Document 1 and Patent Document 2 detect whether a failure has occurred in a system that is actually operating, that is, a system that is operating normally.
- This method provides a test method for determining whether or not a semiconductor integrated circuit before shipment is a non-defective product. It is not something to offer.
- Patent Document 1 and Patent Document 2 require three or more DACs, and there is no failure in three or more DACs simultaneously.
- this conventional method is not suitable for a semiconductor integrated circuit test method for the purpose of determining a good product before shipment.
- the present invention has been made to solve the above-described problems, and enables a test of a semiconductor integrated circuit equipped with two or more DACs to be accelerated, or a semiconductor integrated circuit.
- An object of the present invention is to provide a semiconductor device including a DAC, a semiconductor test device, and a test method for the semiconductor device, which enable a test with a product circuit alone.
- a semiconductor device includes two or more digital-analog converters (hereinafter referred to as DACs) and at least one of the two or more DACs.
- a setting unit that sets digital input values input to two DACs, and a comparison unit that compares the analog output values output from the at least two DACs with each other and outputs the comparison result. It is characterized by having.
- the semiconductor device according to claim 2 of the present invention is the semiconductor device according to claim 1, wherein the setting unit includes a memory for storing a program and the program stored in the memory. And a CPU for controlling a digital input value input to the at least two DACs.
- a semiconductor device is the semiconductor device according to claim 1. And a determination unit for determining whether the at least two DACs are good or bad based on the comparison result.
- a semiconductor device is the semiconductor device according to claim 1, wherein the pattern for generating a pattern for controlling a digital input value input to the at least two DACs is generated.
- a generation unit is further provided.
- the semiconductor device according to claim 5 of the present invention is the semiconductor device according to claim 1, wherein correction is performed to add an offset to the analog output values output from the at least two DACs.
- An offset correction unit is further provided.
- the semiconductor device according to claim 6 of the present invention is the semiconductor device according to claim 1, wherein correction for adding an offset to the digital input values input to the at least two DACs is performed.
- An offset correction unit is further provided.
- the semiconductor test apparatus is an apparatus for performing a pass / fail judgment test of a semiconductor device including two or more DACs, and controls the at least two DACs.
- a control unit a comparison unit that compares the magnitudes of the analog output values output from the at least two DACs with each other, a determination unit that determines whether the two DACs are good or bad based on a comparison result by the comparison unit, It is provided with.
- control unit is configured to output a comparison result of analog output values output from the two DACs.
- the digital input values input to the two DACs are controlled so that the output signals have values that are alternately inverted.
- the semiconductor test apparatus is the semiconductor test apparatus according to claim 7, wherein the comparison unit simultaneously compares analog output values output from a plurality of pairs of the DACs. It is characterized by comprising a plurality of comparators.
- the semiconductor test apparatus according to claim 10 of the present invention is the semiconductor test apparatus according to claim 7, wherein the comparison unit includes one DAC among the at least two DACs. It comprises a plurality of comparators that simultaneously compare the analog output values output from the analog output values of the remaining DACs.
- a semiconductor test apparatus provides the semiconductor test apparatus according to claim 7.
- the determination unit determines whether the two DACs are good or bad depending on whether a comparison result by the comparison unit matches a predetermined pattern.
- the predetermined pattern is a pattern having values that are alternately inverted
- the determination unit Is characterized by determining whether the two DACs are good or bad by determining whether or not the comparison result by the comparison unit is the value that is alternately inverted.
- a test method for a semiconductor device is a test method for a semiconductor device including two or more DACs, and includes a control step of controlling any two of the DACs; A comparison step of comparing the analog output values output from any two of the DACs with each other, and a determination step of determining whether the two arbitrary DACs are good or bad from the comparison result of the comparison step It is characterized by that.
- the semiconductor device test method according to claim 14 of the present invention is the semiconductor device test method according to claim 13, wherein the control step includes analog output values output from the two DACs.
- the digital input values input to the two DACs are controlled so that the output signal of the comparison result of the two becomes a value that is alternately inverted.
- the semiconductor device test method according to claim 15 of the present invention is the semiconductor device test method according to claim 13, wherein the determination step alternately inverts the comparison result of the comparison step. It is characterized by determining whether the two DACs are good or bad by determining whether or not the value is equal to or not.
- a test method for a semiconductor device is a test method for a semiconductor device including two or more DACs, and any one of the two or more DACs.
- a first test process in which only one DAC is tested by a method of directly testing its analog output value; a control process for controlling the digital input values of any two DACs of the two DACs;
- a comparison step of comparing the analog output values output from the two arbitrary DACs with each other, and a determination step of determining whether the two DACs are good or bad from the comparison result of the comparison step.
- the analog output value of any one DAC determined to be non-defective in the first test step is compared with the analog output value of the other one of the two or more DACs. To test the other one DAC And a test process.
- the semiconductor device test method according to claim 17 of the present invention is the semiconductor device test method according to claim 16, wherein the control step includes the arbitrary one DAC and the other The method further includes an offset process for shifting all analog output values of one DAC in any one of positive and negative in the same direction.
- the semiconductor device test method according to claim 18 of the present invention is the semiconductor device test method according to claim 16, wherein the analog output value is different for the same digital input value.
- the control step includes: the digital input value of the first DAC, and the analog output value of the first DAC being the analog value of the second DAC.
- the step of increasing or decreasing to approach the output value, and the first comparison result of the comparison means for comparing the analog output value of the first DAC and the analog output value of the second DAC are inverted.
- a difference between the digital input value of the DAC of 1 and the digital input value of the second DAC is set as an offset value, and the comparison step includes the analog output value of the first DAC
- the first DAC is closer to the analog output value of the second DAC.
- a control unit that sets digital input values of any two DACs, a comparison unit that compares the analog output values of DACs whose digital values are set by the control unit, A determination unit is provided for determining good or bad from the pattern of comparison results output by the comparison means, and the comparison result obtained by comparing the analog values of the paired DACs by the comparison unit is alternately inverted so that the comparison result of each DAC is inverted.
- the digital value is controlled by the control unit, and whether the pattern of the comparison result matches the expected pattern such as “0” and “1” are alternately repeated by the determination unit.
- FIG. 1 is a diagram showing a configuration when a semiconductor integrated circuit test apparatus directly controls a digital input value of a DAC in a semiconductor integrated circuit in Embodiment 1 of the present invention.
- FIG. 2 is a diagram showing a setting pattern and a comparison result when the digital input value power of the DAC is increased by “2” in the first embodiment.
- FIG. 3 is a diagram showing a configuration of a plurality of DACs configured to share a resistance in the first embodiment.
- FIG. 4 (a) is a diagram for explaining the integral linearity error and fine linearity error of the DAC in the first embodiment.
- FIG. 4 (b) is a flowchart showing a test method when the DAC has an integral linearity error or a differential linearity error in Embodiment 2 of the present invention.
- FIG. 4 (c) shows a single DAC test and a test for judging the output of two DACs using a comparator in the second embodiment of the present invention.
- 2 is a diagram showing a configuration of a semiconductor integrated circuit test apparatus that can be executed by the apparatus of FIG.
- FIG. 5 (a) is a diagram showing a configuration example of the voltage dividing DAC.
- FIG. 5 (b) is a diagram showing an analog value when an offset is given to the DAC in Embodiment 3 of the present invention.
- FIG. 5 (c) is a diagram showing a configuration example of a voltage dividing DAC capable of varying the reference voltage.
- FIG. 5 (d) is a diagram showing a configuration of a semiconductor integrated circuit and a semiconductor integrated circuit test apparatus according to Embodiment 3 of the present invention.
- FIG. 6 is a diagram showing a setting pattern of a digital value of a DAC and a comparison result when the digital input value power of the DAC is increased by 'according to Embodiment 3 of the present invention.
- FIG. 7 is a diagram showing an offset value detection procedure in the fourth embodiment of the present invention.
- FIG. 8 is a diagram showing a configuration when the CPU controls the DAC in the fifth embodiment of the present invention.
- FIG. 9 is a diagram showing a configuration when the CPU controls the DAC and performs the test in a single semiconductor integrated circuit in the sixth embodiment of the present invention.
- FIG. 10 is a diagram showing a configuration when a dedicated control circuit controls a DAC and tests a semiconductor integrated circuit alone in Embodiment 7 of the present invention.
- FIG. 1 shows a semiconductor integrated circuit including a digital-analog converter according to Embodiment 1 of the present invention.
- 100 is a semiconductor integrated circuit
- 110 is a register setting unit
- 120 is a register unit
- 130 is a DAC section
- 140 is a switch section
- 150 is a comparison section.
- Reference numeral 160 denotes a semiconductor integrated circuit test apparatus
- 170 denotes a control unit
- 180 denotes a determination unit.
- the semiconductor integrated circuit 100 includes the register setting unit 110, the register unit 120, the DAC unit 130, the switch unit 140, and the comparison unit 150.
- the register setting unit 110 selects an arbitrary register of the register unit 120 and sets its register value by an instruction from the outside.
- the register unit 120 includes registers 1 to n (n
- m 2m; where m is an integer greater than or equal to 1, and sets the digital input value to be input to the DAC unit 130.
- the DAC unit 130 includes DAC1 to DACn, and converts each digital input value into an analog output value.
- the switch unit 140 connects an arbitrary DAC configuring the DAC unit 130 and an arbitrary comparing unit configuring the comparing unit 150.
- the semiconductor integrated circuit test apparatus 160 of the first embodiment includes the control unit 170 and the determination unit 180.
- the control unit 170 controls the register setting unit 110 and the switch unit 140 in the semiconductor integrated circuit 100.
- the determination unit 180 determines the comparison result of the comparison unit 150.
- the switch unit 140 causes the control unit 170 to connect any two DACs to any comparison unit that compares the analog output values of the two DACs. Is set.
- DAC1 and DAC2 having monotonically increasing outputs are provided with an even number and an odd number. Digital input values are then supplied, and then the odd and even digital input values are supplied to DAC1 and DAC2, respectively, and the analog output values of DAC1 and DAC2 are output as "1" and "0". After iteratively repeats, the inspection is performed depending on whether or not it matches the expected value that repeats “0” and “1” alternately.
- the determination unit 180 causes the output pattern of the comparison unit 1 to alternately display an expected value, that is, “0” at the beginning alternately as described above, and thereafter “0” and “1”. And putters appearing alternately It is determined whether or not they match.
- both DACs 1 and 2 are good products, and if they do not match, it can be determined that at least one of the DACs 1 and 2 is not good.
- the determination unit 180 accumulates the output of the comparison unit 1 in a shift register, and compares this with the output of a ROM or the like that stores an expected pattern in advance. Can be realized.
- the outputs of these DACs are sequentially switched by switching the DAC that is a criterion for pass / fail judgment, that is, a DAC to which a digital input value smaller (larger or better) is input in the pair of DACs. Since the values are compared and whether or not the semiconductor integrated circuit is a non-defective product is determined based on whether or not the output pattern sequentially output from the comparison unit 1 matches the expected value, the semiconductor integrated circuit It is possible to determine whether or not is a non-defective product with a small number of comparisons at high speed.
- the DAC is a resistor-divided DAC, as shown in Figure 3, and multiple DACs are divided by a common resistor, even higher-resolution DAC tests are supported. it can
- rO, rl,..., Ri—1, ri are resistors shared by DACl and DAC2, and these resistors are the high voltage side reference voltage VREFH and the low voltage side. They are connected in series with the reference voltage VREFL.
- DAC1 and DAC2 are connected between common connection points (taps) tl,..., Ti-1, ti and analog output node VOUT of DAC.
- SWi-1, SWi connected to the respective switches SW1,..., SWi-1, SWi are connected to the bit signals dl, ⁇ , disconnected by di-1, di. It is also possible to test multiple pairs of DACs at the same time by using a comparison unit other than comparison unit 1 and comparing DACs other than DACl and DAC2 at the same time as DACl and DAC2.
- an even natural number is assigned to DAC1 in ascending order, and an odd natural number is assigned to DAC2.
- This is the power to give DAC1 and DAC2 to be switched in ascending order.This may be as follows. Also, give these to each DAC in descending order, and then replace both DACs.
- DAC1 and DAC2 are forces that are shifted from each other by half a cycle to change the digital input value. This deviation is not limited to a half cycle and may be set to other values. .
- the DA conversion outputs of these two DACs are compared by the comparator, then odd digital values are sequentially input to one DAC, and even digital values are input to the other DAC.
- Sequentially input, and “1” and “0” appear alternately in the output of the comparator, and then whether or not “0” and “1” appear alternately determines the quality of the semiconductor integrated circuit.
- the input / output characteristics of the DAC that can be tested although the output of the DAC that is judged to be good has a monotonic increase in output is shown in FIG. 4 (a).
- the linearity error that is, the worst deviation value from the ideal value for the entire range of input / output characteristics, or the differential linearity error, that is, a certain bit size at any point in the conversion range of input / output characteristics, and theoretically If there is a difference from the bit size, the test cannot be performed.
- the second embodiment is for solving such a problem.
- Figure 4 (a) shows the I / O characteristics drawing of the ADC described in Science Forum, Inc., March 31, 1988, page 686. This is a diversion of the explanation.
- FIG. 4 (b) is a flowchart showing a test method according to the second embodiment.
- the analog output of one of the pair of DACs to be tested (DAC1) is directly or The data is input to a semiconductor integrated circuit test apparatus or the like that passes through the first comparison unit 150 and the integral linearity error and differential linearity error are tested (step 4a).
- Step 4b if the integral linearity error and the differential linearity error fall within a predetermined range and are determined to be non-defective (Step 4b), then the one DAC and the remaining DACs are combined. Then, a test is performed by performing the same comparison as in the first embodiment, and it is determined whether these are non-defective products (steps 4c and 4d).
- FIG. 4 (c) shows an example of the configuration of a semiconductor integrated circuit test apparatus that can perform the tests in steps 4a and 4c described above with the same apparatus.
- 400 is a semiconductor integrated circuit
- 410 is a register setting unit
- 420 is a register unit
- 430 is a DAC unit
- 440 is an arbitrary DAC
- a switch unit that connects an arbitrary comparison unit.
- 460 is a semiconductor integrated circuit test apparatus
- 470 is a control unit
- 480 is a determination unit.
- the register setting unit 410, the register unit 420, and the DAC unit 430 are the same as the register setting unit 110, the register unit 120, and the DAC unit 130 of FIG.
- the bypass lines bpl, bp3,..., Bpn_l are the outputs of DAC1, DAC 3,..., DACn_l passing through the inside of the switch unit 440 and the comparison unit 1, comparison unit 2,. Connect to output of comparator m.
- the no connection nodes nc2, nc4,..., Ncn are nodes that are extracted from the switch unit 440 and cannot be connected anywhere.
- the switch unit 440 outputs the outputs of DAC1, DAC3, ..., DACn_l to the bypass line bpl , bp3,..., bpn—l, connect the outputs of DAC2, DAC4,..., DACn to these no-connection nodes nc2, nc4,.
- step 4a the output of one DAC to be tested is controlled.
- the control unit 470 switches the switch unit 440 so that the outputs of DAC2k-l and DAC2k are connected to the bypass path bp2k_1 and the no-connection node nc2k.
- the digital value set in the register 2k_l and the register 2k by the register setting unit 410 is converted to an analog signal by the DAC 2k-l and DAC2k.
- the analog output of l appears at the output node of the comparison unit k via the bypass path b P 2k_ l without being input to the input node of the comparison unit k, and is output to the determination unit 480.
- step 4b the analog output of DAC2k_l is determined by determining whether or not the integral linearity error and differential linearity error included in the output of DAC2k_l are within an allowable range by determination unit 480. It is determined whether DAC2k_l is non-defective. On the other hand, since the analog output of DAC2k is connected to the no connection node nc2k, the quality of DAC2k is not judged.
- step 4c If it is determined to be non-defective, the test is terminated.
- step 4c when determining the outputs of the DACs using the comparison unit, the control unit 470 outputs the outputs of DAC2k-1, DAC2k and the comparison unit k.
- Switch part 440 is switched so that the two inputs are connected.
- the digital value set in register 2k-l and register 2k by register setting unit 410 is converted to an analog signal by DAC2k-l and DAC2k, and these are converted to two inputs of comparison unit k via switch unit 440. Is output.
- step 4d the analog output of these DAC2k_l and DAC2k is determined by the determination unit 480 whether the output of the comparison unit k is an output pattern in which “0” and “1” appear alternately. Thus, it is determined at high speed whether DAC2k is a non-defective product. That is, if the output of the comparison unit k matches the expected value, the DAC 2k is determined to be non-defective, and if it does not match the expected value, the DAC 2k is determined not to be non-defective and the test is terminated.
- the two DACs when determining whether two DACs are good or bad, after testing one of the DACs with a normal semiconductor test apparatus, the two DACs are implemented. Since the same test as in Form 1 is performed, even if the output of the DAC includes an integral linearity error or a differential linearity error, it is possible to determine the quality at high speed.
- the output when the DAC to be judged as good or bad is a non-defective product such as a voltage dividing type (resistance division type) DAC, the output must be monotonically increasing.
- the third embodiment is intended to enable testing of DACs with more conversion methods.
- Embodiment 3 will be described below.
- DAC1 and DAC2 be DACs to be compared with each other in a resistive voltage dividing DAC as shown in Fig. 5 (a).
- the analog output value output from the DAC is determined by the voltage applied across the resistor.
- the voltage applied across the resistor is VREFH for the high-side reference voltage and VREFL for the low-side reference voltage (DAC1 is VREFH1 and VREFL1, respectively, DAC2 is VREFH2 and VREFL2), and the output voltage of the DAC is a voltage obtained by dividing the reference voltages VREF H and VREFL.
- DAC1 and DAC2 are configured so that each reference voltage can be set independently, and the reference voltage across one DAC (DAC2 in the example of Fig. 5 (b)) is increased by ⁇ .
- the analog output value corresponding to the digital input value also increases by AV.
- the analog output value of DAC2 is higher than the analog output value of DAC1 by ⁇ .
- FIG. 5 (c) shows a configuration of a voltage dividing DAC in which the reference voltage as described above can be set independently.
- VRG is a reference voltage generator that applies the high-side reference voltage VREFH and the low-side reference voltage VREFL to the DAC.
- FIG. 5 (d) shows a configuration of a semiconductor integrated circuit having a DAC capable of independently setting the reference voltage as described above.
- 500 is a semiconductor integrated circuit
- 510 is a register setting unit
- 520 is a register unit that sets a digital value of a DAC
- 530 is a DAC unit
- 540 is an arbitrary DAC and an arbitrary comparator.
- the switch unit 550 is a comparison unit.
- 560 is a semiconductor integrated circuit testing device
- 570 is a control unit
- 580 is a determination unit.
- the register unit 520, the DAC unit 530, the switch unit 540, the comparison unit 550, and the determination unit 580 are respectively the register unit 120, the DAC unit 130, the switch unit 140, the comparison unit 150, and the determination unit 180 of FIG. It is the same thing.
- the DAC unit 530 is different from the DAC unit 130 in FIG. 1, and DAC1 to DACn have reference voltage generators VRG1 to VRGn, and reference voltage generators VRG1, VRG3,. , VRGn_l outputs VREFH1 and VREFL1 as the respective reference voltages to DAC1, DAC3,..., DACn-1 and the reference voltage generators VRG2, VRG4,..., VR Gn are DAC2, DAC4,. ..., VREFH2 and VREFL2 are output to DACn as the respective reference voltages.
- DAC2, DAC4, ..., DACn as shown in Fig. 6, the digital input values are shifted from each other by half a cycle, and both are incremented by one step for comparison.
- the comparison result of the comparator m is inverted every half cycle.
- DAC1, DAC3,..., DACn-1 and DAC2, DAC4, DAC1, DAC4, and so on depend on whether the comparison result of comparator 1, comparator 2,. ..., it can be judged whether DACn is non-defective.
- the digital value of the DAC to be compared can be increased step by step, so testing can be performed for DACs with conversion methods other than voltage division.
- the DAC method may be a method other than the voltage dividing DAC as long as the analog output value can be shifted by ⁇ .
- the reference voltage on the low voltage side and the reference voltage on the high voltage side can be individually set to one of the two DACs, the high voltage side reference voltage applied to the other DAC, Apply the high-voltage reference voltage and the low-voltage reference voltage shifted by (1/2) LSB to the low-voltage side reference voltage, and give the same digital input value to both DACs. Since the output values are compared, even a DAC other than a voltage dividing DAC can be tested if it is a conversion DAC that can shift the analog output value by AV. . In addition, the digital input value input to the DAC that compares the analog output values only needs to be increased by "1", so the control operation of the register setting unit can be simplified.
- the DAC has a high resolution, and there is an offset in the analog output value even if the digital input value is the same between the two DACs to be compared. If the comparison unit has an offset between the two inputs, the output pattern of the comparison unit will be different from the expected value when the register setting unit that sets the DAC digital input value is fixed. I can't carry out the test.
- This Embodiment 4 is for solving this problem.
- Embodiment 4 will be described below.
- the semiconductor device and the semiconductor test device used in the first, second, and third embodiments can be used.
- the digital input values of DAC1 and DAC2 are both “0” (step 70 1).
- the analog output value of DAC1 and DAC2 is determined from the output result of comparator 1 (step 702a). If DAC1 is determined to be greater than DAC2, DAC2 is adjusted to adjust its offset ( Hereinafter, it is referred to as an offset adjustment DAC) (step 702 b). If it is determined that DAC2 is greater than DAC1, DAC1 is set as an offset adjustment DAC (step 702c).
- the digital input value of the offset adjustment DAC is incremented by 1 (step 703a), and when the output of the comparator 1 is inverted (step 703b), the process proceeds to the next step and the current value of the offset adjustment DAC is increased. Is used as the offset value (step 704).
- This The tape functions as an offset correction unit that corrects the input offset.
- the same simplified inspection as that in the first embodiment, the second embodiment, or the third embodiment is performed, that is, the outputs of the two DACs are compared with each other, and the comparison result is obtained.
- the test is performed at high speed by determining whether or not the result matches the expected value (step 705). Furthermore, by detecting individually the state that cannot be measured when there is an offset (step 706), even if there is an output offset even with the same digital input value between two DACs, or even if there is an input offset in the comparator The test can be performed.
- step 706 the offset adjustment DAC determines whether it is DAC1 or DAC2 (step 706a).
- step 706a If it is determined in step 706a that the offset adjustment DAC force is DAC1, the voltage of the analog output value is measured when the digital input value is changed from “0" to the offset value (step 706a). 706b), measure the voltage of the analog output value when the digital input value of DAC2 is changed from (2k— “offset value”) to 2k (step 706c). Offset adjustment DAC power When it is determined that DAC2, DAC1 and DAC2 are interchanged, and the same operation as described above is performed.
- step 706a if it is determined in step 706a that the offset adjustment DAC force is DAC2, voltage measurement of the analog output value is performed when the digital input value is changed from “0” to the offset value. (Step 706d), measure the voltage of the analog output value when the digital input value of DAC1 is changed to (2k— “offset value”) force 2k (Step 700e).
- step 705 the state in which the test cannot be performed in step 705, that is, the analog output values of DAC1 and DAC2 other than the region where the output dynamic ranges overlap each other is measured individually. Is possible.
- the same digital input value is given to two DACs, the analog output values are compared, and the DAC with the smaller analog output value is set as the offset adjustment DAC.
- Offset adjustment The digital input value is incremented by “1” until the DAC output is inverted, and the digital input value at the time when the comparison result of the analog output value is inverted is used as the offset value.
- offset adjustment DAC Determine which DAC has the larger analog output value, and measure the analog output value when the digital input value of the corresponding DAC is changed from "0" to the offset value.
- Analog voltage measurement is performed when the digital input value of the DAC is changed from (2k— “offset value”) to 2k, so if there is an output offset between the two DACs Even if there is an input offset in the unit, it is possible to determine the quality of the DAC at high speed.
- the semiconductor test apparatus controls the digital input value of the DAC. For this reason, many test terminals are required for semiconductor integrated circuits, and a tester channel for controlling the test terminals is required during the test. Tester channels installed in semiconductor test equipment are limited, and the increase in test terminals limits the number of DACs that can be tested simultaneously.
- the fifth embodiment solves this. The fifth embodiment will be described with reference to FIG.
- 800 is a semiconductor integrated circuit
- 810 is a CPU bus
- 811 is a CPU
- 812 is a memory
- 820 is a register unit for setting a digital value of the DAC
- 830 is a DAC unit
- 840 is an arbitrary DAC.
- a switch unit for connecting an arbitrary comparator, 850 is a comparison unit.
- Reference numeral 860 denotes a semiconductor integrated circuit test apparatus
- 870 denotes a control unit
- 880 denotes a determination unit.
- the register unit 820, the DAC unit 830, the switch unit 840, the comparison unit 850, and the determination unit 880 are respectively the register unit 120, the DAC unit 130, the switch unit 140, the comparison unit 150, and the determination unit 180 of FIG. It is the same thing.
- the CPU 811 operates according to a program stored in the memory 812.
- the memory 812 stores a program for setting the register unit 820 and the switch unit 840 in the same manner as in FIG.
- the control unit 870 generates a trigger signal that controls the start of operation of the CPU 811.
- control unit 870 sends a signal to the CPU 811.
- the CPU 811 that has received the signal controls the register unit 820 and the switch unit 840 in the same manner as in the first embodiment in accordance with a program installed in the memory 812.
- the switch unit 840 is controlled to continue.
- the CPU 811 sequentially sets the values of register 1, register 3, ..., register n— 1 to 0, 2,..., 2k, 1, 3,. At the same time, a half cycle later, the values of register 2, register 4, ..., register n are sequentially set to 1, 3, ..., 2k-l, 0, 2, ..., 2k
- DAC1, DAC3,..., DACn—1 and DAC2, DAC4,..., DACn digital input values are shifted from each other by half a cycle and incremented by “2”.
- DACn When the digital input value of 1 reaches the settable upper limit “2k”, this time, the digital input value of DAC2, DAC4,. After the cycle, the digital input values of DAC1, DAC3,..., DACn—1 are set to “1”, respectively, and then DAC1, DAC3,..., DACn—1 and DAC2, DAC4,. , The DACn digital input values are shifted from each other by half a cycle and incremented by "2".
- the judgment unit 180 causes the output patterns of the comparison unit 1, comparison unit 2,..., Comparison unit m to be expected values, that is, “1” at the beginning as described above. It is determined whether or not the pattern coincides with a pattern in which “0” appears alternately and thereafter “0” and “1” appear alternately.
- Comparison unit 1 If the output pattern of the comparison unit 1, comparison unit 2,..., Comparison unit m matches the expected value, DAC1 and 2, DAC3 and 4,. If they do not match, DA C1 and 2, DAC3 and 4, ⁇ , DACn—1 and n are judged to be non-defective
- the CPU mounted on the semiconductor integrated circuit side sets the register unit and the switch unit in accordance with the program stored in the memory, and the semiconductor The control unit on the integrated circuit test device side simply controls the start of operation of the CPU, so the connection between the semiconductor integrated circuit and the semiconductor integrated circuit test device is possible with a small number of wires. It is possible to reduce the number of test terminals to be provided to a small number. Also, the number of terminals of the semiconductor integrated circuit test apparatus can be reduced to a small number.
- a semiconductor test apparatus is required for the test.
- a test can be performed without using a semiconductor test apparatus.
- the sixth embodiment will be described with reference to FIG.
- 900 is a semiconductor integrated circuit
- 910 is a CPU bus
- 911 is a CPU
- 912 is a memory
- 920 is a register unit for setting a digital value of a DAC
- 930 is a DAC unit
- 940 is an arbitrary DAC.
- Switch unit connected to any comparator 950 is the comparison unit
- 980 is the result output register It is a star.
- the result output register 980 is mounted on the semiconductor integrated circuit 900, holds the comparison result of the comparison unit 950, and outputs it to the CPU bus 910.
- the DAC and the switch unit are controlled in the same manner as in the fifth embodiment, and the comparison result of the comparison unit 950 is output to the CPU bus 910 through the result output register 980.
- the CPU 911 follows the program installed in the memory 912, reads the value of the result output register via the CPU bus 910, and compares it with the expected value to determine pass / fail. That is, the outputs of the comparison unit 1, comparison unit 2,..., Comparison unit m are DAC 1 and 2, DAC 3 and 4,. After 0 appears alternately, 0 and 1 appear alternately.
- the result output register 980 stores these m output patterns, and the storage result is output to the CPU 911 via the CPU bus 910.
- the CPU 911 also operates as a determination unit by determining whether or not each output pattern output to the result output register 980 matches the above-described expected value. As a result, it is possible to test the semiconductor integrated circuit alone.
- the result output register mounted on the semiconductor integrated circuit side holds the comparison result of the comparison unit, and outputs this to the CPU in the semiconductor integrated circuit. Since the CPU determines the result of the comparison, the DAC test can be performed only with the semiconductor integrated circuit without using the semiconductor integrated circuit test apparatus.
- the CPU needs to execute a test program, and the CPU cannot be used for other purposes while the test is being performed.
- the seventh embodiment is for solving this problem.
- Embodiment 7 will be described with reference to FIG.
- 1000 is a semiconductor integrated circuit
- 1010 is a CPU bus
- 1011 is a CPU
- 10 12 is a memory
- 1013 is a pattern generation unit
- 1014 is a control unit
- 1015 is an offset correction unit
- 1 020 is a register unit for setting a digital value of DAC
- 1030 is a DAC unit
- 1040 is any DAC and any comparison unit 1050 is a comparison unit
- 1080 is a result output register that outputs a comparison result of the comparison unit to the CPU bus 1010.
- CPU bus 1010, CPU 1011, memory 1012, register unit 1020, DAC unit 1030, switch unit 1040, comparison unit 1050, and result output register 1080 are the CPU bus 910, CPU911, memory 912, and register of Fig. 9, respectively.
- ⁇ 920, DAC ⁇ 930, switch ⁇ 940, i comparison B 950, and result output register 980 are the same.
- the pattern generation unit 1013 generates a pattern for setting the register unit 1020.
- the offset correction unit 1015 corrects the offset of each register 1, register 2,.
- the control unit 1014 controls each register according to the pattern generated by the pattern generation unit 1013 and the offset value output from the offset correction unit 1015.
- a pattern for setting the register unit 1020 is generated by the pattern generation unit 1013, and the control unit 1014 controls the register unit 1020.
- the method for obtaining the offset value is the same as in the fourth embodiment and is shown in FIG.
- the pattern generation unit 1013 generates a pattern, and the control unit 1014 sets the register unit 1020 according to the pattern.
- a pattern is generated so that the initial state is the digital input value S "0" of DAC1 and DAC2 (step 701).
- the control unit 1014 reads the value in the result output register 1080, determines which of the analog output values of DAC1 and DAC2 is smaller, and notifies the pattern generation unit 1013 of the smaller one as an adjustment DAC (step 702).
- the pattern generation unit 1013 generates a pattern so as to increase the digital input value of the adjustment DAC by “1”, and the control unit 1014 sets the register unit 1020 according to the pattern.
- the comparison result of the output of the DAC unit 1030 according to the setting is stored in the result output register 1080, and the control unit 1014 reads the value of the result output register 1080 and the comparison result is inverted (step 703).
- the current digital value is notified to the offset correction unit 1015 as an offset value, and the offset correction unit 1015 stores the offset value (step 704).
- the control unit 1014 notifies the pattern generation unit 1013 that the offset value has been obtained, and the pattern generation unit 1013 moves to an operation for starting comparison.
- the pattern generation unit 1013 generates a pattern, and the control unit 1014 receives the DAC and offset value information from the offset correction unit 1015 according to the pattern and adds the offset value to the register. Set part 1020.
- the control unit 1014 reads the value of the result output register 1080 and determines whether or not it matches the expected value pattern (step 705). After that, it is judged whether the DAC is good or bad by individually detecting the state that cannot be measured when there is an offset (step 706). This makes it possible to perform DAC tests without using a CPU.
- the CPU can test other circuits such as a main memory mounted on the semiconductor integrated circuit during the DAC test by the control unit.
- the offset correction unit can be omitted.
- the pattern generation unit, the offset correction unit, and the control unit are provided, and these perform the test operation performed by the CPU. Allows other operations to be performed during DAC testing.
- the present invention is useful for simultaneously determining whether a plurality of DACs are good or not at high speed, and is suitable for testing a semiconductor integrated circuit equipped with a plurality of DACs.
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Abstract
Description
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JP2008512036A JPWO2007122950A1 (ja) | 2006-03-23 | 2007-03-22 | 半導体装置、半導体試験装置、及び半導体装置の試験方法 |
US12/293,910 US7791519B2 (en) | 2006-03-23 | 2007-03-22 | Semiconductor device, semiconductor device testing apparatus, and semiconductor device testing method |
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US20090128382A1 (en) | 2009-05-21 |
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US7791519B2 (en) | 2010-09-07 |
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