WO2005066646A1 - タイミングクロック校正方法 - Google Patents
タイミングクロック校正方法 Download PDFInfo
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- WO2005066646A1 WO2005066646A1 PCT/JP2004/018700 JP2004018700W WO2005066646A1 WO 2005066646 A1 WO2005066646 A1 WO 2005066646A1 JP 2004018700 W JP2004018700 W JP 2004018700W WO 2005066646 A1 WO2005066646 A1 WO 2005066646A1
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- clock
- timing
- shift
- delay
- amount
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/15—Arrangements in which pulses are delivered at different times at several outputs, i.e. pulse distributors
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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
- G01R31/31917—Stimuli generation or application of test patterns to the device under test [DUT]
- G01R31/31922—Timing generation or clock distribution
-
- 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
-
- 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
- G01R31/3183—Generation of test inputs, e.g. test vectors, patterns or sequences
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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
- G01R31/31903—Tester hardware, i.e. output processing circuits tester configuration
- G01R31/31908—Tester set-up, e.g. configuring the tester to the device under test [DUT], down loading test patterns
- G01R31/3191—Calibration
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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
- G01R31/31937—Timing aspects, e.g. measuring propagation delay
Definitions
- the present invention relates to a timing clock calibration method.
- the present invention relates to a timing clock calibrating method for calibrating a timing clock generator that generates a timing clock indicating a timing at which a test signal is supplied to a device under test.
- a test apparatus for testing a semiconductor device generates a timing clock for generating a timing clock for generating an arbitrary waveform, which is a basic function of the test apparatus, and generates a shift clock for linearizing the timing clock.
- the timing clock generation unit includes a variable timing delay unit configured by a variable delay circuit, and a linearization memory that stores a set value for selecting a delay path of the variable delay circuit, and that controls the delay path in real time.
- An arbitrary timing clock is generated by switching with.
- the shift clock generator has a phase synchronization circuit and generates a shift clock of an arbitrary phase. Then, while comparing the timing clock with the shift clock by the timing clock's shift clock phase comparison unit, the phase of the timing clock is determined based on the assumption that the shift clock has high-precision phase linearity.
- the phase of the timing clock is linearized by adjusting to the phase of the linear clock, and the set value stored in the linear rice memory is set.
- an object of the present invention is to provide a timing clock calibration method that can solve the above-mentioned problems. This object is achieved by a combination of the features described in the independent claims.
- the dependent claims define further advantageous embodiments of the present invention.
- a timing clock generator that generates a timing clock indicating a timing at which a test signal is supplied to a device under test by delaying a reference clock, and a phase synchronization circuit are used.
- Shift clock generator that generates a shift clock that is used to calibrate the timing clock generator, and timing that compares the phase of the shift clock generated by the shift clock generator with the timing clock generated by the timing clock generator.
- a timing clock calibration method for calibrating a timing clock generation unit in a test apparatus including a clock and a shift clock phase comparison unit, wherein the timing clock is adjusted by using the shift clock while changing the shift amount of the edge of the shift clock.
- the shift clock calibration stage for calibrating the shift amount of the edge of the shift clock by the shift clock generation unit based on the period of the timing clock, and the shift clock generation unit calibrated in the shift clock calibration stage perform the shift clock generation.
- the shift clock generator includes a reference clock that compares a high-level time or a low-level time between a reference signal corresponding to the reference clock and a shift signal corresponding to the shift clock.
- a voltage-controlled oscillator that changes the shift amount of the edge of the shift clock according to the comparison result by the shift clock phase comparator, and a reference clock.
- the input signal is applied to the shift signal input to the shift clock phase comparator.
- a pulse control unit for changing the shift amount of the edge of the shift clock by superimposing, the shift clock calibrating step includes: a reference clock, an input node superimposed on the shift signal input to the shift clock phase comparator; ⁇ The number of shifts per unit time is sequentially changed to reduce the shift amount of the edge of the shift clock.
- the timing clock generator includes a timing variable delay unit including a plurality of variable delay circuits for sequentially delaying the reference clock, and a timing variable delay unit for obtaining the delay time in association with the delay time of the reference clock.
- a linearization memory for holding the set value, and in the timing clock calibration step, by sequentially changing the set value of the timing variable delay unit, while changing the delay amount of the timing clock, a predetermined shift is performed.
- a shift clock edge detection step for detecting the edge of the shift clock whose amount has been shifted, and a setting when the timing clock edge coincides with the shift clock edge in association with the delay time that is a predetermined shift amount.
- the amount of delay to calibrate the amount of timing clock delay by holding the value in Linear Rice 'memory Yo Le also have a positive stage.
- the timing clock generation unit delays the reference clock to generate a plurality of timing clocks, respectively, and generates a plurality of timing clocks and skews the plurality of timing clocks generated by the plurality of timing variable delays.
- a plurality of skew variable delay units for respectively delaying a plurality of timing clocks for adjustment, the timing clock's shift clock phase comparison unit is provided with a plurality of timing variables with the shift clock generated by the shift clock generation unit.
- the delay section may have a plurality of timing comparing sections for comparing phases with a plurality of timing clocks generated respectively. Then, the timing clock calibration method adjusts the delay amounts of the plurality of skew variable delay sections, respectively, so that the phases of the plurality of timing clocks generated by the plurality of variable timing delay sections are almost equal in the plurality of timing comparison sections.
- the shift clock calibrating step includes a step of calibrating a shift amount of an edge of the shift clock with reference to a period of one timing clock of the plurality of timing clocks.
- the method includes a step of calibrating delay amounts required to delay each of the plurality of timing clocks by a predetermined shift amount with reference to the phases of the plurality of timing clocks adjusted in the delay amount adjusting step. May be.
- the timing clock generator includes a timing variable delay unit that delays the reference clock to generate the timing clock, and a timing clock that adjusts a skew of the timing clock generated by the timing variable delay unit.
- a skew variable delay unit for delaying wherein the timing clock shift clock phase comparison unit compares a phase between the shift clock generated by the shift clock generation unit and the timing clock generated by the timing variable delay unit. It may have a timing comparison unit to compare.
- the timing clock calibration method further includes a delay amount adjusting step of adjusting a delay amount of the skew variable delay unit to adjust a phase of the timing clock generated by the timing variable delay unit in the timing comparison unit.
- the step of calibrating the shift clock includes a step of calibrating a shift amount of an edge of the shift clock with reference to a cycle of the timing clock, and the timing clock calibrating step includes adjusting the timing clock adjusted in the delay amount adjusting step. And a step of calibrating a delay amount necessary to delay the timing clock by the predetermined shift amount based on the phase of the timing clock.
- a plurality of timing variable delay units for generating a timing clock indicating a timing at which a test signal is supplied to a device under test by delaying a reference clock;
- the skew of the plurality of timing clocks generated by the variable delay unit is adjusted.
- the plurality of skew variable delay units for delaying the plurality of timing clocks, respectively, and the plurality of timing variable delay units are calibrated using the phase synchronization circuit.
- a plurality of timings for comparing the phases of the shift clock generated by the shift clock generator and the plurality of timing clocks generated by the plurality of timing variable delay units, respectively.
- a plurality of timing A timing clock calibration method for calibrating a variable delay unit comprising: a plurality of skew variable delay units that allow a plurality of timing clocks generated by a plurality of timing variable delay units to be substantially equal in a plurality of timing comparison units.
- the plurality of timing clocks adjusted in the delay amount adjusting stage are detected. Multiple timings based on the timing clock phase And a timing clock calibration step of each Calibration delay amount required for delaying the respective clock by a predetermined shift amount.
- the present invention it is possible to provide a timing clock calibration method for linearizing a timing clock with high accuracy and in a short time.
- FIG. 1 is a diagram showing an example of a configuration of a test apparatus 100.
- FIG. 2 is a diagram showing an example of a configuration of a shift clock generator 116.
- FIG. 3 is a diagram showing a timing chart of a shift clock generator 116.
- FIG. 4 is a diagram showing an example of a configuration of a timing clock generation unit 110 and a timing clock ′ shift clock phase comparison unit 11 2.
- FIG. 5 is a diagram showing an example of a flow of a timing clock calibration method.
- FIG. 6 is a diagram illustrating a delay adjustment stage (S100).
- Plant 7 is a diagram illustrating the step of measuring the number of inserted pulses (S204).
- FIG. 8 is a diagram showing a relationship between the phase of a shift clock and the number of input pulses.
- FIG. 1 shows an example of a configuration of a test apparatus 100 according to an embodiment of the present invention.
- the test apparatus 100 includes a pattern generation unit 102, a waveform shaping unit 104, a determination unit 106, a comparison unit 108, a timing clock generation unit 110, a timing clock 'shift clock phase comparison unit 112, a reference clock generation unit 114, and a shift clock generation unit. It has 116.
- the reference clock generator 114 generates a reference clock that is used as a reference when the test device 100 tests the device under test 150. Then, the timing clock generator 110 delays the reference clock to supply the test signal generated by the pattern generator 102 to the device under test 150 for generating an arbitrary waveform which is a basic function of the test apparatus 100. Is generated. Further, shift clock generating section 116 generates a shift clock used for calibrating timing clock generating section 110 using a phase locked loop such as a PLL (Phase Locked Loop) circuit. The timing clock. The shift clock phase comparison unit 112 compares the shift clock generated by the shift clock generation unit 116 with the shift clock. Then, the phase of the timing clock is compared with the timing clock generated by the timing clock generator 110, and the phase of the timing clock is calibrated using the shift clock.
- PLL Phase Locked Loop
- the pattern generating section 102 generates a test signal for testing the device under test 150. Further, the waveform shaping unit 104 shapes the waveform of the test signal generated by the pattern generating unit 102, and supplies the test signal to the device under test 150 based on the timing clock generated by the timing clock generating unit 110. Next, based on the timing clock generated by the timing clock generator 110, the comparator 108 outputs the output signal output by the device under test 150 in response to the test signal, and outputs the output signal by the device under test 150 in response to the test signal. It compares with the expected value of the output signal to be output and outputs the comparison result. Then, the determination unit 106 determines the acceptability of the device under test 150 based on the comparison result output by the comparison unit 108.
- the shift amount of the shift clock is calibrated based on the timing clock, so that the timing The clock phase can be calibrated with high accuracy. Therefore, the device under test 150 can be accurately tested, and the quality of the device under test 150 can be appropriately determined.
- FIG. 2 shows an example of the configuration of the shift clock generator 116 according to the present embodiment.
- the shift clock generator 116 includes a voltage controlled oscillator 200, a plurality of T flip-flop circuits 202a-202d, a plurality of T flip-flop circuits 204a-204d, a flip-flop circuit 206, a flip-flop circuit 208, an AND circuit 210, and a logic circuit 210.
- An OR circuit 212, an OR circuit 214, a reference clock 'shift clock phase comparator 216, a plurality of flip-flop circuits 218a to 218g, an AND circuit 220, an AND circuit 222, and a flip-flop circuit 224 are provided.
- SCLK and 1Z16SCLK of the present embodiment are examples of the shift clock of the present invention
- REFCLK and 1 / 16REFCLK of the present embodiment are examples of the reference clock of the present invention
- PDOUTA of the present embodiment is an example of the shift signal of the present invention
- PDOUTB of the present embodiment is an example of the reference signal of the present invention.
- the reference clock 'shift clock phase comparison unit 216 compares the high-level or low-level time between PDOUT A corresponding to 1Z16SCLK and PDOUTB corresponding to 1Z16REFCLK, and the pulse areas of PDOUTA and PDOUTB become equal. To the comparison result. Output the same control signal.
- the voltage controlled oscillator 200 receives the control signal output from the reference clock ′ shift clock phase comparator 216 and changes the shift amount of the SCLK edge according to the comparison result by the reference clock ′ shift clock phase comparator 216.
- the pulse control section 228 changes the shift amount of the SCLK edge by superimposing an input pulse on PDOUT A input to the reference clock 'shift clock phase comparison section 216. Further, the pulse collect memory 226 holds the number of input pulses to be superimposed on PD OUTA per unit time in association with the shift amount of SCLK. For example, the number of cycles of the SCLK and the number of cycles of the input pulse are held and checked.
- FIG. 3 shows a timing chart of the shift clock generator 116 according to the present embodiment.
- FIG. 3A shows a timing chart in the case where the input pulse is locked in a state where the input pulse is not superimposed on PDOUTA.
- FIG. 3 (b) shows a timing chart in the case where the input pulse is locked with the input pulse superimposed on PDOUTA.
- the voltage control oscillator 200 controls the shift amount based on the control signal output from the reference clock shift clock phase comparator 216 and outputs SCLK.
- the T flip-flop circuits 202a to 202d are connected in series, and sequentially latch and output an H level signal based on the SCLK output from the voltage controlled oscillator 200. That is, the T flip-flop circuits 202a to 202d output a 1/16 SCLK obtained by dividing the frequency of the SCLK output from the voltage controlled oscillator 200.
- the T flip-flop circuits 204a to 204d are connected in series, and sequentially latch and output an H level signal based on REFCLK generated by the reference clock generation unit 114. That is, the T flip-flop circuits 204a to 204d output 1/16 REFCLK obtained by dividing the REFCLK generated by the reference clock generating unit 114.
- the flip-flop circuit 206 uses an inverted signal of an AND operation result of the output A of the flip-flop circuit 206 and the output B of the flip-flop circuit 208 by the AND circuit 210 as a enable signal, Based on 1Z16SCLK output from the circuit 202d, latch the H level signal and output A.
- the flip-flop circuit 208 uses the inverted signal of the logical product of the output A of the flip-flop circuit 206 and the output B of the flip-flop circuit 208 by the logical product circuit 210 as an enable signal to generate a T flip-flop. Based on 1/16 REFCLK output from the top circuit 204d, the H level signal is latched and B is output. That is, the output A of the flip-flop circuit 206 and the output B of the flip-flop circuit 208 are reset when both become H logic.
- the flip-flop circuits 218a and 218g are connected in series, and sequentially latch and output 1 / 16REFCLK output from the T flip-flop circuit 204d based on REFCLK generated by the reference clock generation unit 114. That is, each of the flip-flop circuits 218a to 218g delays the phase of 1/16 REFCLK by one cycle of REFCLK.
- the logical product circuit 220 calculates the logical product of the 1/16 REFCLK output from the T flip-flop circuit 204d and the inverted signal of the signal output from the flip-flop circuit 218d and whose 1/16 REFCLK phase is delayed by four REFCLK cycles. The operation result of is output.
- the AND circuit 222 is composed of a signal output from the flip-flop circuit 218e and having a 1/16 REFCLK phase delayed by 5 cycles of REFCLK, and a signal output from the flip-flop circuit 218g and a 1/16 REFCLK phase having 7 cycles of REFCLK.
- the operation result of the AND operation of the inverted signal of the signal delayed by the minute and the insertion request output by the pulse control unit 228 is output.
- the flip-flop circuit 224 latches and outputs the output of the AND circuit 222 based on the REFCLK generated by the reference clock generator 114.
- the insertion request is not set by the pulse control unit 228, and the logical product circuit 222 generates the logical sum operation result. Since an L level signal is output, the flip-flop circuit 224 outputs an L level signal and no insertion pulse is output. On the other hand, if the insertion pulse is superimposed on PDOUTA and locked, the input request is set by the pulse control unit 228, and the AND circuit 222 outputs the H level as the operation result of the OR operation. Since the signal is output, flip-flop circuit 224 outputs an H-level signal, and an input pulse is output.
- the OR circuit 212 performs an OR operation on the output A of the flip-flop circuit 206 and the input pulse output from the flip-flop circuit 224, and compares the operation result PDOUTA with the reference clock 'shift clock phase. Supply to section 216. If the input noise is not superimposed on PDOUTA and locked, the OR circuit 212 outputs the flip-flop. The output A of the circuit 206 is supplied to the reference clock. Shift clock phase comparator 216 as PDOUTA, which is the operation result of the OR circuit 212. On the other hand, when the insertion pulse is superimposed on PDOUTA and locked, the OR circuit 212 superimposes the input pulse output from the flip-flop circuit 224 on the output A of the flip-flop circuit 206.
- the signal is supplied to the reference clock shift clock phase comparator 216 as PDOUTA.
- the OR circuit 214 performs an OR operation on the output B of the flip-flop circuit 208 and the output of the AND circuit 220, and supplies the operation result PDOUTB to the reference clock shift clock phase comparator 216. I do.
- the input request is output from the pulse control unit 228, and the input pulse output from the flip-flop circuit 224 is superimposed on PDOUTA, so that the pulse area of PDOUTA and PDOUTB is reduced.
- the reference clock shift clock phase comparator 216 causes the voltage control oscillator 200 to control the pulse areas of PDOUTA and PDOUTB to be equal.
- the shift amount of SCLK can be controlled, and the shift amount of 1/16 SCLK supplied to the timing clock and shift clock phase comparator 112 can be controlled.
- 1/16 SCLK can be shifted by 0.98 ps by inserting a once-input pulse into PDOUTA at 8192 cycles of SCLK. Then, by inserting an insertion pulse into PDOUTA in every cycle of SCLK, 1/16 SCLK can be shifted by 8 ns which is the pulse width of the insertion pulse.
- FIG. 4 shows an example of the configuration of the timing clock generator 110 and the timing clock's shift clock phase comparator 112 according to the present embodiment.
- the timing clock generator 110 has a plurality of timing generators 400a-400x, a plurality of generalization memos 402a-402x, a plurality of timing variable delay units 404a 404x, and a plurality of skew variable delay units 406a 406x.
- the timing clock 'shift clock phase comparing unit 112 has a plurality of timing comparing units 407a and 407x.
- Each of the timing comparison units 407a and 407x includes each of the flip-flop circuits 408a to 408x, each of the AND circuits 410a to 410x, and each of the counters 412a to 412x.
- the timing generators 400a to 400x are circuits for extracting a pulse at an arbitrary position from the reference clock (REFCLK) generated by the reference clock generator 114, and have a delay resolution equal to or longer than the period of the reference clock.
- the timing variable delay units 404a to 404x include a plurality of variable delay circuits for sequentially delaying the reference clocks cut out by the timing generation units 400a and 400x, respectively, and generate a plurality of timing clocks.
- the linearization memories 402a to 402x hold set values for setting the delay paths of the timing variable delay units 404a to 404x for obtaining the delay time in association with the delay time of the reference clock.
- Re-realize memory 402a A timing clock for generating an arbitrary waveform, which is a basic function of the test apparatus 100, by switching the delay path of the variable timing delay unit 404a 404x in real time based on the set value held by the 402. Occurs.
- the skew variable delay units 406a and 406x respectively delay a plurality of timing clocks that adjust the skew of the plurality of timing clocks generated by the plurality of timing variable delay units 404a to 404x.
- the timing comparison units 407a to 407x include a shift clock (1/16 SCLK) generated by the shift clock generation unit 116, a plurality of variable timing delay units 404a to 404x, and a plurality of variable skew delay units 406a.
- the flip-flop circuits 408a to 408x latch and output the timing clocks output by the skew variable delay units 406a to 406x based on the shift clock generated by the shift clock generation unit 116.
- the AND circuits 410a to 410x output the operation result of the AND operation between the respective outputs of the flip-flop circuits 408a to x and the shift clock generated by the shift clock generator 116.
- the counters 412a and 412x count the number of times that each of the AND circuits 410a to 410x outputs an H level signal. For example, when the phase of the shift clock and the phase of the timing clock are compared a plurality of times while the shift amount of the edge of the shift clock and the delay amount of the timing clock are fixed, the counter 412a and the count power of the 412x, When the number of comparisons with the lock is about half, it is determined that the phases of the shift clock and the timing clock match.
- FIG. 5 shows an example of the flow of the timing clock calibration method according to the present embodiment.
- FIG. 9 is a diagram illustrating a delay amount adjustment step (S100) according to the present embodiment.
- FIG. 7 is a diagram illustrating the step of measuring the number of inserted pulses (S204) according to the present embodiment.
- the plurality of timing clocks generated by the plurality of timing variable delay units 404 a to 404 x are respectively substantially equalized by the plurality of timing comparison units 407 a to 407 x.
- the delay amounts of the skew variable delay units 406a and 406x are adjusted. More specifically, the timing clock's shift clock phase comparator 112 detects the phases of a plurality of timing clocks generated by the timing clock generator 110 with the shift clock generated by the shift clock generator 116, and Detects the timing clock late. Then, by changing the shift amount of the shift clock, the phase of the shift clock is made to coincide with the phase of the detected timing clock. Then, as shown in FIG. 6, the delay amounts of the plurality of skew variable delay units 406a to 406x that adjust the phases of other timing clocks of the detected timing clock to the phase of the shift clock are adjusted.
- the shift clock generation unit 116 changes the shift amount of the edge of the shift clock, and arbitrarily selects a plurality of timing clocks using the shift clock. Detects the edge of one timing clock multiple times. Thus, the shift amount of the edge of the shift clock by the shift clock generating unit 116 is calibrated based on the cycle of the timing clock. More specifically, in the timing clock edge detection stage (S202), the number of insertion pulses superimposed on the PDO UTA input to the reference clock shift clock phase comparison unit 216 is sequentially changed to change the number of insertion pulses per unit time. The edge of the timing clock is detected a plurality of times while changing the shift amount of the edge of the clock.
- the shift amount of the edge of the shift clock is superimposed on PDOUTA in order to change by a predetermined period of the timing clock.
- Measure the number of incoming pulses For example, as shown in FIG. 7, when the frequency of REFCLK is 250 MHz, the number of input pulses to be superimposed on the shift signal in order to change the shift amount of the edge of the shift clock by a half cycle (4 ns) of the timing clock. As measured, 4096+.
- the shift amount calculation step (S206) the measurement is performed in the input pulse number measurement step (S204).
- the shift amount of the edge of the shift clock by one insertion pulse superimposed on the shift signal is calculated based on the number of the inserted pulses and the time of the predetermined period of the timing clock, thereby shifting the edge of the shift clock. Calibrate the quantity.
- the shift clock generator 116 calibrated in the shift clock calibration stage (S 200) outputs the input pulse number measured in the input pulse number measurement stage (S 204).
- the edges of the shift clock are sequentially generated by shifting a predetermined shift amount.
- the delay required to delay each of the timing clocks by a predetermined shift amount with reference to the phases of the timing clocks adjusted in the delay amount adjustment step (S100). Calibrate the amounts individually.
- the shift clock edge detection step (S402) the set values of the variable timing delay units 404a-404x are sequentially changed based on the set values held by the linearization memories 402a-402x.
- the delay path is switched to detect the edge of the shift clock shifted by a predetermined shift amount while changing the delay amounts of a plurality of timing clocks.
- the set value at the time when the edge of the timing clock coincides with the edge of the shift clock is associated with the delay time which is a predetermined shift amount, and the linear rice memory 402a— Calibrating the delay amounts of a plurality of timing clocks by holding them at 402x.
- FIG. 8 shows the relationship between the phase of the shift clock and the number of insertion pulses according to the present embodiment.
- the horizontal axis represents the number of incoming pulses
- the vertical axis represents the phase of the shift clock.
- the straight line a represents the relationship between the ideal shift clock phase and the number of input pulses
- the curve b represents the relationship between the actual shift clock phase and the number of input pulses
- the straight line c Represents the relationship between the phase of the first-order linearly corrected shift clock and the number of input pulses.
- the skews 11N are matched by using the skew variable delay units 406a 406x, so that the timing clock / shift clock Of a plurality of timing clocks input to the phase comparator 112.
- the phase range of the shift clock to be used can be narrowed, so that the linearity error can be minimized, the timing clock can be linearized with high accuracy, and the time required for linearizing the timing clock can be shortened. Can shrink force.
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Abstract
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DE112004002615T DE112004002615B4 (de) | 2004-01-09 | 2004-12-15 | Verfahren zur Kalibrierung eines Zeitsteuertakts |
JP2005516826A JPWO2005066646A1 (ja) | 2004-01-09 | 2004-12-15 | タイミングクロック校正方法 |
US11/481,868 US7190174B2 (en) | 2004-01-09 | 2006-07-06 | Method for calibrating timing clock |
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US11/481,868 Continuation US7190174B2 (en) | 2004-01-09 | 2006-07-06 | Method for calibrating timing clock |
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EP2026081A4 (en) * | 2006-05-01 | 2010-10-06 | Advantest Corp | TEST DEVICE AND TESTING METHOD |
KR101418015B1 (ko) | 2008-02-20 | 2014-07-09 | 삼성전자주식회사 | 스큐 조정 회로 및 방법 |
KR101313104B1 (ko) * | 2009-07-24 | 2013-09-30 | 한국전자통신연구원 | 이종 주기 클록 도메인간의 동기화 시스템, 동기화 장치, 동기화 실패 검출 회로 및 데이터 수신방법 |
US8924765B2 (en) * | 2011-07-03 | 2014-12-30 | Ambiq Micro, Inc. | Method and apparatus for low jitter distributed clock calibration |
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2004
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- 2004-12-15 DE DE112004002615T patent/DE112004002615B4/de not_active Expired - Fee Related
- 2004-12-15 KR KR1020067015701A patent/KR100733184B1/ko not_active IP Right Cessation
- 2004-12-15 WO PCT/JP2004/018700 patent/WO2005066646A1/ja active Application Filing
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JP2001013217A (ja) * | 1999-06-30 | 2001-01-19 | Advantest Corp | タイミング校正方法及びこのタイミング校正方法を用いて校正動作する位相補正回路を搭載したic試験装置 |
JP2001108725A (ja) * | 1999-10-08 | 2001-04-20 | Advantest Corp | 半導体デバイス試験装置のタイミング位相校正方法・装置 |
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JPWO2005066646A1 (ja) | 2007-12-20 |
KR20060106855A (ko) | 2006-10-12 |
DE112004002615B4 (de) | 2008-10-16 |
US20060284621A1 (en) | 2006-12-21 |
KR100733184B1 (ko) | 2007-06-28 |
US7190174B2 (en) | 2007-03-13 |
DE112004002615T5 (de) | 2006-10-26 |
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