WO2005121827A1 - タイミング発生器および半導体試験装置 - Google Patents
タイミング発生器および半導体試験装置 Download PDFInfo
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- WO2005121827A1 WO2005121827A1 PCT/JP2005/010348 JP2005010348W WO2005121827A1 WO 2005121827 A1 WO2005121827 A1 WO 2005121827A1 JP 2005010348 W JP2005010348 W JP 2005010348W WO 2005121827 A1 WO2005121827 A1 WO 2005121827A1
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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
- G01R31/3183—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
- G01R31/31708—Analysis of signal quality
- G01R31/31709—Jitter measurements; Jitter generators
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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
Definitions
- the present invention relates to a timing generator used for a semiconductor test device or the like.
- Jitter tolerance test is a test item of various devices such as high-speed communication and high-speed serial interface. In this test, it is confirmed whether or not the device operates normally when jitter is added to the clock signal or data input to the device.
- a semiconductor test apparatus performs various tests on a device.
- a jitter tolerance test is performed using the semiconductor test apparatus, a jitter is generated at a timing edge generated by a timing generator. Need to be added.
- a jitter generator that adds jitter to a clock signal or the like a configuration including a variable delay circuit that delays a clock signal or the like is known (for example, see Patent Document 1). By comparing the offset voltage of the sine wave with the output voltage of the ramp generator, a sine wave fluctuation is given to the timing of the change of the clock signal.
- Patent Document 1 JP-A-6-104708 (Pages 3-4, Fig. 1-3)
- the jitter generator disclosed in Patent Document 1 described above is configured by analog circuits such as an oscillator that generates a sine-wave offset voltage, a ramp generator, and a voltage comparator.
- analog circuits such as an oscillator that generates a sine-wave offset voltage, a ramp generator, and a voltage comparator.
- a timing generator is a logical LSI that generates a timing edge, and there is a problem that it is not preferable to mix a jitter generator configured by an analog circuit in the same LSI.
- the manufacturing process becomes complicated, which leads to an increase in manufacturing cost, and the analog circuit becomes a noise source for the digital circuit.
- the present invention has been made in view of the above points, and its purpose is to provide an output signal. It is possible to provide a timing generator that can add jitter and can reduce the circuit scale without the need for an analog circuit that adds jitter, thereby reducing power consumption. is there.
- a timing generator In order to solve the above-described problem, a timing generator according to the present invention generates a timing edge at a designated timing within a basic cycle, and performs a counting operation synchronized with a reference clock signal having a predetermined cycle.
- a counter that performs the following operations; a timing data output unit that outputs data corresponding to each of a quotient and a remainder obtained by dividing a time required to generate a leading edge of a basic cycle by a cycle of a reference clock signal; and a counter.
- Elapsed time determination means for determining that a time corresponding to a quotient indicated by data output from the timing data output means has elapsed based on the count value, and outputting a determination signal in accordance with the determination timing; and Jitter generation means for outputting the time to shift the output timing as a jitter amplitude value Adding means for adding the first time corresponding to the remainder indicated by the output data, the second time indicated by the jitter amplitude value output from the jitter generating means, and the elapsed time
- a variable delay unit that receives a determination signal output from the determination unit, delays the determination signal by a time indicated by the addition result by the addition unit, and outputs the delayed signal.
- variable delay means When the variable delay means is used to generate a timing edge, jitter can be added to the timing edge by changing the delay time in the variable delay means by a time corresponding to the jitter amplitude value. become. This makes it possible to add jitter to the timing edge as an output signal simply by adding a digital circuit for adding the jitter amplitude value to the configuration for setting the delay time of the variable delay means, thereby reducing the circuit scale and consuming power. The power can be reduced.
- the above-mentioned elapsed time determination means compares the count value of the counter with the quotient indicated by the data output from the timing data output means, and outputs a determination signal when they match.
- the above-described counter takes a quotient indicated by the output data of the timing data output means as an initial value, and then performs a counting operation of decreasing the count value in synchronization with the reference clock signal.
- the elapsed time determination means outputs a determination signal when detecting that the count force of the counter has reached ⁇ . Is desirable. This makes it possible to easily determine the elapse of time corresponding to an integral multiple of the cycle of the reference clock signal.
- the above-mentioned jitter generating means outputs a jitter amplitude value whose value changes in a sine wave shape in synchronization with the output of the timing edge.
- sine wave jitter can be easily added to the output signal, and very high frequency sine wave jitter synchronized with the output of the timing edge can be added.
- the above-mentioned jitter generating means outputs a jitter amplitude value whose value changes randomly in synchronization with the output of the timing edge.
- random jitter can be easily added to the output signal, and very high frequency random jitter synchronized with the timing edge output can be added.
- the above-mentioned jitter generating means outputs a jitter amplitude value in which a value update interval changes randomly.
- the above-mentioned addition means, when an addition result corresponding to a period of one cycle or more of the reference clock signal is obtained, carries and, based on the addition result, the reference clock signal.
- the addition result of less than one cycle is output, and when the carry is output, the time corresponding to an integral multiple of the cycle of the reference clock signal, the elapsed time determination means is output.
- the output determination signal is input to the variable delay means. It is desirable to further include input timing delay means for delaying the timing. This makes it possible to reliably delay the timing of the timing edge by a time corresponding to an integral multiple of the cycle of the reference clock signal.
- the addition means described above further sets a time corresponding to the shift to a first time and a second time. It is desirable to add.
- the start timing of the basic period can be set asynchronously with the reference clock signal, and a plurality of basic periods having an arbitrary value can be set continuously.
- the semiconductor test apparatus of the present invention includes the above-described timing generator, a pattern generator for generating pattern data to be input to each pin of the device under test, and a pattern generator. And the device under test that inputs this pattern data.
- FIG. 1 is a diagram showing an overall configuration of a semiconductor test apparatus provided with a timing generator according to one embodiment.
- FIG. 2 is a diagram showing a detailed configuration of a timing generator.
- FIG. 3 is an explanatory diagram of the operation principle of the jitter generation circuit.
- FIG. 4 is a diagram showing a specific configuration example of a jitter generation circuit.
- FIG. 5 is a diagram showing another specific configuration example of the jitter generation circuit.
- FIG. 6 is a diagram showing another specific example of the jitter generation circuit.
- FIG. 7 is a diagram showing another specific example of the jitter generation circuit.
- FIG. 8 is an operation timing chart of the timing generator of the present embodiment.
- FIG. 9 is a diagram showing a modification of the timing generator.
- FIG. 1 is a diagram illustrating an overall configuration of a semiconductor test apparatus including a timing generator according to one embodiment.
- the semiconductor test equipment shown in Fig. 1 is used to perform various tests including a jitter tolerance test on the DUT (device under test) 100, and inputs and outputs various signals required for the test to and from the DUT 100.
- the system includes a tester processor 110, a timing generator 120, a pattern generator 130, a data selector 140, a format controller 150, a pin card 160, and a digital comparator 170.
- the above-described tester processor 110 controls the entire semiconductor test apparatus to execute various tests on the DUT 100 by executing a predetermined test program by an operating system (OS).
- the timing generator 120 sets a basic cycle required for the test, and generates various timing edges included in the set basic cycle.
- the pattern generator 130 generates pattern data to be input to each pin of the DUT 100 including the clock pin.
- the data selector 140 associates various pattern data output from the pattern generator 130 with each pin of the DUT 100 that inputs the data. Format Toco
- the control unit 150 controls the waveform of the DUT 100 based on the pattern data generated by the pattern generator 130 and selected by the data selector 140 and the timing edge generated by the timing generator 120.
- the pin card 160 is for taking a physical interface between the format controller 150 and the digital comparator 170 and the DUT 100.
- the pin card 160 includes a driver for applying a predetermined pattern waveform to a corresponding pin of the DUT 100, a dual comparator for simultaneously comparing a voltage waveform appearing at the pin with a predetermined low-level voltage and a high-level voltage, and an optional load current. And a termination resistor having a predetermined resistance value (for example, 50 ⁇ ) connected to the pin.
- Some of the pins of the DUT100 such as the pins corresponding to the address terminals, only input predetermined data.For these pins, the dual comparator, programmable load, and termination resistor described above are unnecessary. And only the driver is connected.
- the digital comparator 170 compares the output of each pin of the DUT 100 with the expected value data of each pin selected by the data selector 140. The timing for performing this comparison is specified by the timing edge STRB of the strobe signal generated by the timing generator 120.
- FIG. 2 is a diagram showing a detailed configuration of the timing generator 120.
- the timing generator 120 includes a counter 10, a timing memory 12, a coincidence determination circuit 14, a manoplexer 16, a D-FF (D-type flip-flop) 18, 20, 22, a RATE memory 24, It includes the arithmetic units 26, 28, 30, the jitter generation circuit 32, the inverter circuit 34, the AND circuits 36, 38, the FIFO memory 40, and the variable delay circuit 42.
- the counter 10 is reset by a RATE signal and performs a counting operation in synchronization with a REFCLK (reference clock) signal.
- the RATE signal is used to set the basic cycle required for the test, and is set to the high level for one REFCLK signal cycle corresponding to the start timing of the basic cycle.
- the REFCLK signal has a period of, for example, 4 ns.
- the timing memory 12 is for storing time data indicating a timing edge occurrence timing with reference to the start timing of the basic cycle.
- Time data that is an integral multiple of the cycle of the REFCLK signal (refer to the basic cycle)
- the quotient divided by the period of the clock signal Is the upper n bits (MSB) and the time data below this period (the value indicating the remainder when the basic period is divided by the period of the reference clock signal) is the lower m bits (LSB).
- An address signal (TS signal) is input in synchronization with the RATE signal, and the (n + m) -bit time data that indicates the timing of the occurrence of the timing edge within the basic cycle set in response to this RATE signal is stored in the timing memory. Read from 12.
- the coincidence determination circuit 14 receives the count value (n bits) of the counter 10 and the upper n bits of the time data of the timing memory 12 and performs a coincidence determination on all these bits. When all these bits match, the output of the match determination circuit 14 goes high.
- the RATE memory 24 stores m-bit data as a remainder obtained by dividing the immediately preceding basic cycle by the cycle of the REFCLK signal.
- the adder 30 adds the m-bit data read from the RATE memory 24 and the m-bit data stored in the D-type flip-flop 22. This result is stored in the D-type flip-flop 22 in synchronization with the REFCLK signal. Therefore, data obtained by dividing each basic cycle by the cycle of the REFCLK signal is accumulated using the adder 30 and the D-type flip-flop 22.
- the adder 26 adds the lower-order m-bit data of the timing memory 12 and the m-bit data output from the adder 30 described above.
- the m-bit addition result is input to the subsequent adder 28. If a carry from the most significant bit occurs in this addition processing, carry is sent to the multiplexer 16.
- the adder 28 adds the m-bit data output from the previous-stage adder 26 and the m-bit jitter component data output from the jitter generating circuit 32.
- the m-bit addition result is input to the FIFO memory 40. If a carry from the most significant bit occurs in this addition processing, carry is sent to the multiplexer 16.
- the multiplexer 16 receives the signal (1 bit data) output from the match determination circuit 14 and the signal output from each of the two D-type flip-flops 18 and 20, and , 28 to perform a selection operation according to the carry sent from.
- One D-type flip-flop 18 captures and holds the signal output from the match determination circuit 14 in synchronization with the REFCLK signal.
- the other D-type flip-flop 20 is It captures and holds the output signal in synchronization with the REFCLK signal. In this way, the signal output from the match determination circuit 14, a signal obtained by delaying this signal by one cycle of the REFCLK signal, and a signal obtained by delaying the signal by two cycles are input to the multiplexer 16.
- the multiplexer 16 selectively outputs the output signal of the match determination circuit 14 according to the presence or absence of carry output from each of the two adders 26 and 28, specifically, when no carry is input.
- the output signal of the D-type flip-flop 18 (a signal obtained by delaying the output signal of the coincidence determination circuit 14 by one cycle of the REFCLK signal) when only one of the carry signals is input is selectively output.
- an output signal of the D-type flip-flop 20 (a signal obtained by delaying the output signal of the coincidence determination circuit 14 by two cycles of the REFCLK signal) is selectively output.
- the AND circuit 36 receives the output signal of the multiplexer 16 and a signal obtained by inverting the REFCLK signal by the inverter circuit 34, and outputs an AND signal of these two signals.
- the jitter generation circuit 32 generates jitter component data.
- the FIFO memory 40 fetches the m-bit data, which is also output from the adder 28, in synchronization with the output signal of the AND circuit 38 (the logical product signal of the output signal of the match determination circuit 14 and the REFCLK signal), and outputs the output of the AND circuit 36.
- the captured data is output in the order of input in synchronization with the signal.
- the variable delay circuit 42 has a maximum variable delay amount corresponding to one cycle of the REFCLK signal, and delays the output signal of the AND circuit 36 by a time corresponding to the m-bit data output from the FIFO memory 40. And output.
- FIG. 3 is an explanatory diagram of the operation principle of the jitter generation circuit 32, and shows a case where, for example, sine wave jitter is added to the timing edge generated by the timing generator 120.
- the horizontal axis represents the elapsed time
- the vertical axis represents the jitter amplitude value representing the value of the added sine wave jitter.
- the jitter generation circuit 32 generates and outputs j-bit jitter amplitude value data whose value periodically changes with time.
- FIG. 4 is a diagram showing a specific configuration example of the jitter generation circuit 32.
- the jitter generation circuit shown in FIG. 4 includes a counter 50 and a jitter memory 52.
- the counter 50 performs a counting operation in synchronization with REFCLK.
- the jitter memory 52 stores an error specified by the count value of the counter 50.
- a j-bit jitter amplitude value data is stored in the address, and when the counting operation of the counter 50 proceeds in synchronization with the REFCLK signal, the jitter amplitude value data is sequentially read.
- the jitter memory 52 not only the sine wave jitter as shown in FIG. 3 but also various types of jitter can be easily generated simply by changing the content of the stored jitter amplitude value data. By synchronizing with the reference clock signal, very high frequency jitter synchronized with the timing edge output can be added.
- FIG. 5 is a diagram showing another specific configuration example of the jitter generation circuit 32.
- the jitter generating circuit shown in FIG. 5 includes an exclusive OR circuit 60, a plurality of D-type flip-flops 62, a counter 50, and a jitter memory 52.
- the counter 50 and the jitter memory 52 are the same as those shown in FIG. 4, and a random bit string generation circuit comprising an exclusive OR circuit 60 and N cascade-connected D-type flip-flops 62 at the preceding stage of the counter 50. Is provided.
- the exclusive OR circuit 60 receives two output values of the N D-type flip-flops 62, and outputs an exclusive OR signal of these two output values to a predetermined (for example, the first stage).
- the random bit string generated in this way is input to the counter 50 as a clock signal. Therefore, in the configuration shown in FIG. 4, the counting operation of the counter 50 is performed regularly in synchronization with the REF CLK signal, whereas in the configuration shown in FIG. 5, the counting operation of the counter 50 is performed according to the contents of the random bit string. The difference is that it is performed irregularly. By making the intervals at which the jitter components are added unequal, it is possible to add jitter having temporal randomness.
- FIG. 6 is a diagram showing another specific example of the jitter generation circuit 32.
- the jitter generation circuit shown in FIG. 6 includes a random bit string generation circuit composed of an exclusive OR circuit 60 and a plurality of D-type flip-flops 62.
- the random bit string generation circuit itself is the same as that included in the configuration shown in FIG. 5, in which j outputs are taken out in parallel from a plurality of D-type flip-flops 62 and are used as j-bit jitter amplitude value data. Used. Thereby, random jitter can be easily generated. In addition, a very high frequency random jitter synchronized with the output of the timing edge can be added.
- FIG. 7 is a diagram illustrating another specific example of the jitter generation circuit 32.
- the jitter generation circuit shown in FIG. 7 includes an exclusive OR circuit 60, a plurality of D-type flip-flops 62, and a logic circuit 70. ing.
- the random bit string generation circuit itself composed of an exclusive OR circuit 60 and a plurality of D-type flip-flops 62 is the same as that included in the configuration shown in FIG. 5, and a logic circuit 70 is connected to the subsequent stage. .
- the logic circuit 70 receives all or some outputs of the plurality of D-type flip-flops 62 in parallel, and performs predetermined processing on the data of the plurality of bits.
- the contents of the predetermined process include, for example, a process of setting an upper limit value and a lower limit value of data and masking data out of these ranges, a process of performing a calculation based on a predetermined formula, and converting the value of the data. Is included.
- the output j-bit data is used as the jitter amplitude value data.
- the above-mentioned timing memory 12 is variable as timing data output means
- the coincidence determination circuit 14 is variable as elapsed time determination means
- the jitter generation circuit 32 is variable as jitter generation means
- the adders 26, 28 and 30 are variable as addition means.
- the delay circuit 42 corresponds to variable delay means
- the multiplexer 16 and the D-type flip-flops 18 and 20 correspond to input timing delay means.
- FIG. 8 is an operation timing chart of the timing generator 120 of the present embodiment.
- the period of the REFCLK signal is 4 ns
- the basic period set by the RATE signal is 4.8 ns, 7.5 ns, 18. Ons
- the timing edge generation timing within each basic period is 3.3 ns , 4. Ons, 11. Ons are assumed to be set (Fig. 8 (A)).
- the counter 10 starts counting operation synchronized with the REFCLK signal and outputs the first count value “0” (Fig. 8 (C), (D )).
- the operation of reading out the upper n bits (MSB) and lower m bits (LSB) data corresponding to the timing 3.3 ns of the timing edge occurrence is performed from the timing memory 12. Since the timing of the occurrence of the timing edge 3.3 ns is smaller than the period of the REFCLK signal 4.
- the upper n bits of data having a content of “0” and the value corresponding to 3.3 ns The lower m bits of data to be the contents are read (FIGS.
- the read upper n-bit data “0” is input to the match determination circuit 14, and the lower m-bit data is input to the adder 26.
- the process of writing the data is performed.
- the coincidence determination circuit 14 compares the n-bit data “0” read from the timing memory 12 with the first count value “0” of the counter 10. In this case, since the two values match, a high-level signal is output from the match determination circuit 14 (FIG. 8 (F)).
- the variable delay circuit 42 delays the signal input from the AND circuit 36 by a time corresponding to the m-bit data output from the FIFO memory 40, and outputs the delayed signal.
- the calculation result indicated by the m-bit data output from the adder 28 is (3.3 + pl) ns
- the m-bit data indicating the full addition result output from the adder 28 is Since the signal is input to the variable delay circuit 42 via the FIFO memory 40, the variable delay circuit 42 outputs a signal obtained by delaying the signal input from the AND circuit 36 by (3.3 + p 1) ns ( (Fig. 8 (N)).
- the counter 10 starts counting operation synchronized with the REFCLK signal from the initial value ⁇ 0 ''. Start again.
- the RATE signal corresponding to the next basic cycle 7.5 ns corresponds to the previous basic cycle 4.8 ns
- the period corresponding to the REFCLK signal in the second cycle becomes high level, and thereafter becomes low level (Fig. 8 (B), (C)).
- the timing memory 12 In parallel with the counting operation by the counter 10, the timing memory 12 outputs the upper n bits (MSB) and the lower m bits (LSB) data corresponding to the timing of the timing edge 4. Ons. A read operation is performed. Timing of occurrence of the timing edge 4. Ons is the same as the period of the REFCLK signal. 4. In this case, the upper n bits of data containing "1" and 0. Ons The lower m bits of data containing the value to be read are read (Fig. 8 (E), (G)). The read upper n-bit data “1” is input to the match determination circuit 14, and the lower m-bit data is input to the adder 26.
- MSB upper n bits
- LSB lower m bits
- the match determination circuit 14 compares the n-bit data “1” read from the timing memory 12 with the first count value “0” of the counter 10. In this case, since the two values do not match, the match determination circuit 14 outputs a low-level signal. Next, when the count of the counter 10 proceeds and the count value becomes “1”, the n-bit data read from the timing memory 12 matches the count value “1” of the power counter 10, so that the match determination circuit 14 Outputs a high-level signal power S (Fig. 8 (F)).
- the m-bit data indicating the remainder of 0.8 ns divided by Ons is read (Fig. 8 (H)). Also, from the D-type flip-flop 22, the RATE memory 24 corresponds to the immediately preceding basic period of 4.8 ns. The read and held m-bit data indicating 0. Ons is read (FIG. 8 (1)). Further, j-bit data corresponding to the jitter amplitude value p2 is read from the jitter generation circuit 32 (FIG. 8Ci)).
- the variable delay circuit 42 delays the signal input from the AND circuit 36 by a time corresponding to the m-bit data output from the FIFO memory 40, and outputs the delayed signal.
- the calculation result indicated by the m-bit data output from the adder 28 is (0.8 + p2) ns
- the m-bit data indicating the full addition result output from the adder 28 is Since the signal is input to the variable delay circuit 42 via the FIFO memory 40, the variable delay circuit 42 outputs a signal obtained by delaying the signal input from the AND circuit 36 by (0.8 + p2) ns (see FIG. 8 (N)).
- the timing memory 12 In parallel with the counting operation by the counter 10, the timing memory 12 outputs the upper n bits (MSB) and the lower m bits (LSB) data corresponding to the timing of the timing edge 11. Ons. A read operation is performed. Timing of occurrence of timing edge 11. Since Ons is calculated by double-calculating twice Ons of 4ns which is the period of REFCLK signal and 3.Ons, in this case, the upper n bits of 2 The data and the lower-order m-bit data containing the value corresponding to 3. Ons are read (Fig. 8 (E), (G)). The read upper n-bit data “2” is input to the match determination circuit 14, and the lower m-bit data is input to the adder 26.
- the match determination circuit 14 compares the n-bit data “2” read from the timing memory 12 with the first count value “0” of the counter 10. In this case, since the two values do not match, the match determination circuit 14 outputs a low-level signal. When the count of the counter 10 advances and the count value becomes “2”, the n-bit data read from the timing memory 12 matches the count value “2” of the counter 10, so that the match determination circuit 14 And a high level signal is output (Fig. 8 (F)).
- the m-bit data indicating 3.5 ns remaining after being divided by Ons is read (Fig. 8 (H)). Also, from the D-type flip-flop 22, the m-bit data indicating 0.8 ns which is read and held from the RATE memory 24 corresponding to the immediately preceding basic period of 7.5 ns is read (FIG. 8 (1)). ). Further, j-bit data corresponding to the jitter amplitude value p3 is read from the jitter generation circuit 32 (FIG. 8Ci)).
- the AND circuit 36 outputs a signal that maintains a high level during the high level section of the next cycle of the REFCLK signal, and inputs the signal to the variable delay circuit 42.
- the variable delay circuit 42 outputs a signal obtained by delaying the signal input from the AND circuit 36 by (3.3 + p3) ns.
- the jitter amplitude values pl, p2, and p3 output from the jitter generation circuit 32 change in each cycle of the REFCLK signal in the configurations shown in Figs. 4 and 6; In the configuration shown in Fig. 7, the value does not always change in each cycle of the REFCLK signal, so the same value may be maintained continuously.
- the above-mentioned jitter generating means outputs a jitter amplitude value whose value changes randomly in synchronization with the output of the timing edge.
- random jitter can be easily added to the output signal, and very high frequency random jitter synchronized with the timing edge output can be added.
- the above-mentioned jitter generating means outputs a jitter amplitude value in which a value update interval changes randomly. By making the intervals at which the jitter component is added unequal, random jitter with improved randomness can be added.
- the carry is output from the adders 26 and 28.
- the multiplexer 16 selects one of the outputs of the D-type flip-flops 18 and 20 to reliably delay the timing of the timing edge by a time corresponding to an integer multiple of the cycle of the reference clock signal. be able to.
- the start timing of the basic cycle and the input timing of the reference clock signal do not match (in the case of the basic cycle of 7.5 ns and 18. Ons shown in FIG. 8), the time corresponding to this difference is obtained. Is added using the adder 30 to set a delay time for generating a timing edge. With this, the start timing of the basic cycle can be set asynchronously with the reference clock signal. It is possible to continuously set a plurality of basic periods having.
- the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention.
- the counter 10 starts the counting operation when the RATE signal is input, and when the count value matches the value indicated by the n-bit data output from the MSB of the timing memory 12.
- the high-level signal is output from the match determination circuit 14 in the above, the same operation may be performed using another configuration.
- FIG. 9 is a diagram showing a modification of the timing generator.
- the configuration shown in FIG. 9 is different from the configuration shown in FIG. 2 in that the counter 10 is replaced with a counter 10A that reduces the count value synchronized with the reference clock signal, and the coincidence determination circuit 14 is replaced with a counter value of ⁇ 0 ''.
- the difference is that a zero determination circuit (corresponding to the elapsed time determination means) 14A that determines that the condition has been reached and outputs a determination signal is provided.
- the counter 10A takes in the n-bit data output from the MSB of the timing memory 12 and starts the counting operation.
- the zero determination circuit 14A outputs a noise level signal when the count value of the counter 10A becomes “0”. Even when such a configuration is used, a signal having the same content as the output signal of the match determination circuit 14 can be output from the zero determination circuit 14A.
- variable delay means when used to generate a timing edge, by changing the delay time in the variable delay means by a time corresponding to the jitter amplitude value, Jitter can be added.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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DE112005001349T DE112005001349T5 (de) | 2004-06-09 | 2005-06-06 | Taktgenerator und Halbleitertestvorrichtung |
KR1020067025384A KR101139141B1 (ko) | 2004-06-09 | 2005-06-06 | 타이밍 발생기 및 반도체 시험 장치 |
JP2006514493A JP4806631B2 (ja) | 2004-06-09 | 2005-06-06 | タイミング発生器および半導体試験装置 |
US11/570,042 US7665004B2 (en) | 2004-06-09 | 2005-06-06 | Timing generator and semiconductor testing apparatus |
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JP2004170704 | 2004-06-09 | ||
JP2004-170704 | 2004-06-09 |
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WO2005121827A1 true WO2005121827A1 (ja) | 2005-12-22 |
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US (1) | US7665004B2 (ja) |
JP (1) | JP4806631B2 (ja) |
KR (1) | KR101139141B1 (ja) |
DE (1) | DE112005001349T5 (ja) |
WO (1) | WO2005121827A1 (ja) |
Cited By (2)
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JP2010528266A (ja) * | 2007-05-18 | 2010-08-19 | テラダイン、 インコーポレイテッド | ジッタ較正 |
US8320440B2 (en) | 2009-03-04 | 2012-11-27 | Advantest Corporation | Equalizer circuit |
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JP4489000B2 (ja) * | 2005-10-12 | 2010-06-23 | 株式会社東芝 | 電子タイマー及びシステムlsi |
US8225128B2 (en) * | 2007-03-01 | 2012-07-17 | Conemtech Ab | Electronic timer system, time control and generation of timing signals |
KR101756944B1 (ko) * | 2011-07-01 | 2017-07-12 | 페어차일드코리아반도체 주식회사 | 클록 신호 생성 회로 및 이를 포함하는 전력 공급 장치 |
KR101970516B1 (ko) * | 2012-12-24 | 2019-08-13 | 에스케이하이닉스 주식회사 | 클럭 생성 회로 |
US11095295B2 (en) | 2018-06-26 | 2021-08-17 | Silicon Laboratories Inc. | Spur cancellation for spur measurement |
US10659060B2 (en) | 2018-09-27 | 2020-05-19 | Silicon Laboratories Inc. | Spur cancellation with adaptive frequency tracking |
US10680622B2 (en) * | 2018-09-27 | 2020-06-09 | Silicon Laboratories Inc. | Spur canceller with multiplier-less correlator |
US10819353B1 (en) | 2019-10-04 | 2020-10-27 | Silicon Laboratories Inc. | Spur cancellation in a PLL system with an automatically updated target spur frequency |
CN112711295A (zh) * | 2019-10-25 | 2021-04-27 | 瑞昱半导体股份有限公司 | 时序产生器、时序产生方法以及控制芯片 |
US11038521B1 (en) | 2020-02-28 | 2021-06-15 | Silicon Laboratories Inc. | Spur and quantization noise cancellation for PLLS with non-linear phase detection |
US11316522B2 (en) | 2020-06-15 | 2022-04-26 | Silicon Laboratories Inc. | Correction for period error in a reference clock signal |
KR20230039135A (ko) | 2021-09-13 | 2023-03-21 | 삼성전자주식회사 | 패턴 생성기 및 이를 포함하는 내장 자체 시험 장치 |
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- 2005-06-06 JP JP2006514493A patent/JP4806631B2/ja not_active Expired - Fee Related
- 2005-06-06 KR KR1020067025384A patent/KR101139141B1/ko active IP Right Grant
- 2005-06-06 DE DE112005001349T patent/DE112005001349T5/de not_active Withdrawn
- 2005-06-06 US US11/570,042 patent/US7665004B2/en active Active
- 2005-06-06 WO PCT/JP2005/010348 patent/WO2005121827A1/ja active Application Filing
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JPH0850156A (ja) * | 1994-08-05 | 1996-02-20 | Anritsu Corp | ジッタ耐力測定装置 |
JPH1123666A (ja) * | 1997-07-03 | 1999-01-29 | Seiko Epson Corp | ジッター発生回路 |
JP2000002757A (ja) * | 1998-04-10 | 2000-01-07 | Sony Tektronix Corp | デ―タ・パタ―ン生成装置 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2010528266A (ja) * | 2007-05-18 | 2010-08-19 | テラダイン、 インコーポレイテッド | ジッタ較正 |
US8320440B2 (en) | 2009-03-04 | 2012-11-27 | Advantest Corporation | Equalizer circuit |
Also Published As
Publication number | Publication date |
---|---|
JPWO2005121827A1 (ja) | 2008-04-10 |
JP4806631B2 (ja) | 2011-11-02 |
KR20070029734A (ko) | 2007-03-14 |
KR101139141B1 (ko) | 2012-04-26 |
US20090132884A1 (en) | 2009-05-21 |
DE112005001349T5 (de) | 2007-04-26 |
US7665004B2 (en) | 2010-02-16 |
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