WO2011027553A1 - 経年劣化診断装置、経年劣化診断方法 - Google Patents
経年劣化診断装置、経年劣化診断方法 Download PDFInfo
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- WO2011027553A1 WO2011027553A1 PCT/JP2010/005387 JP2010005387W WO2011027553A1 WO 2011027553 A1 WO2011027553 A1 WO 2011027553A1 JP 2010005387 W JP2010005387 W JP 2010005387W WO 2011027553 A1 WO2011027553 A1 WO 2011027553A1
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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
- G01R31/2851—Testing of integrated circuits [IC]
- G01R31/2855—Environmental, reliability or burn-in testing
- G01R31/2856—Internal circuit aspects, e.g. built-in test features; Test chips; Measuring material aspects, e.g. electro migration [EM]
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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
- G01R31/2851—Testing of integrated circuits [IC]
- G01R31/2882—Testing timing characteristics
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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
- H03K5/13—Arrangements having a single output and transforming input signals into pulses delivered at desired time intervals
- H03K5/133—Arrangements having a single output and transforming input signals into pulses delivered at desired time intervals using a chain of active delay devices
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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
- G01R31/2851—Testing of integrated circuits [IC]
- G01R31/2884—Testing of integrated circuits [IC] using dedicated test connectors, test elements or test circuits on the IC under test
Definitions
- the present invention relates to an aging deterioration diagnosis apparatus and an aging deterioration diagnosis method for a semiconductor integrated circuit.
- the present invention relates to a semiconductor integrated circuit aging deterioration diagnosis device and an aging deterioration diagnosis method characterized by being small in area and resistant to environmental influences and easy to introduce and use in a semiconductor circuit.
- a semiconductor chip becomes a defective product when its performance deteriorates beyond a certain level by use after shipment.
- the deterioration in performance due to use can be attributed to a lifespan (reasonable performance deterioration due to aging) or an accidental failure.
- a lifespan reasonable performance deterioration due to aging
- an accidental failure if it is determined that the product is defective in maintenance, etc., it can be determined whether the failure is due to the lifetime (reasonable deterioration in performance due to aging) or accidental failure. It can be difficult.
- a ring oscillator is configured using a CMOS circuit.
- the oscillation frequency can be digitally encoded by using a counter, and the degree of deterioration can be diagnosed with a simple circuit configuration without using an external measuring instrument.
- the measurement time is shortened by using two ring oscillators for test and reference to improve the resolution of the degree of deterioration in the practical range. .
- the oscillation frequency to be measured greatly fluctuates due to the influence of the environment (for example, variation in chip temperature and power supply voltage).
- the environment for example, variation in chip temperature and power supply voltage.
- This problem is improved to some extent in the technique of Non-Patent Document 1 by measuring the ratio of the oscillation frequencies using two ring oscillators.
- a difference frequency signal of the two ring oscillators is generated, and the degree of deterioration is detected by the difference frequency signal and one of the two ring oscillators.
- the risk of being affected by environmental fluctuations with one of the two ring oscillators cannot be avoided, and will still be affected to some extent by environmental fluctuations.
- the present invention provides a semiconductor integrated circuit aging deterioration diagnosis apparatus capable of canceling the influence of the environment at the time of measuring the progress of performance deterioration of a semiconductor integrated circuit with a simple configuration, and capable of performing measurement in a short time. It is an object to provide a method for diagnosing aging.
- a first ring oscillator in which a ring oscillator is configured using a plurality of odd-numbered logic gates configured using CMOS circuits, and a plurality of odd-numbered logic gates having the same configuration as the logic gate are used.
- a second ring oscillator constituting a ring oscillator, a load unit for inputting a load signal to the first ring oscillator or the second ring oscillator, and an instruction to start oscillation of the first ring oscillator and the second ring oscillator And a control unit that simultaneously inputs a control signal to the first ring oscillator and the second ring oscillator, and a movement amount of a pulse in each of the first ring oscillator and the second ring oscillator in the same time
- An aged deterioration diagnosis apparatus having a comparison unit for comparing differences is provided.
- the second ring oscillator can constitute a ring oscillator using the same number of logic gates as the first ring oscillator.
- a logic gate to which the control signal is directly input from the control unit of each of the first ring oscillator and the second ring oscillator is a first logic gate, and an output signal of the Nth logic gate Is the N + 1th logic gate
- the comparison unit includes a first counter for counting the number of pulses of the output signal of the Mth logic gate of the first ring oscillator, and the second ring oscillator.
- a second counter that counts the number of pulses of the output signal of the Mth logic gate; and at least two that respectively store signals output by at least two of the plurality of logic gates constituting the first ring oscillator.
- the comparison unit may include a plurality of first storage units that respectively store signals output from all the logic gates constituting the first ring oscillator at that time. .
- a first ring oscillator in which a ring oscillator is configured using a plurality of odd-numbered logic gates configured using CMOS circuits, or a plurality of odd-numbered logic gates having the same configuration as the logic gate is used.
- a method of diagnosing aging comprising: simultaneously inputting to a two-ring oscillator; and comparing a difference in pulse movement amount in each of the first ring oscillator and the second ring oscillator within the same time period.
- the second ring oscillator can be configured as a ring oscillator using the same number of the logic gates as the first ring oscillator.
- a logic gate to which the control signals of the first ring oscillator and the second ring oscillator are directly input is a first logic gate, and an output signal of an Nth logic gate is input.
- the logic gate is the (N + 1) th logic gate
- the step of comparing the difference in the amount of movement of the pulse is a predetermined number in which the count value of the number of pulses of the output signal of the Mth logic gate of the first ring oscillator is predetermined.
- An aging deterioration diagnosis apparatus and an aging deterioration diagnosis method use a test ring oscillator to which a load signal is input for a certain period of time and a reference ring oscillator to which a load signal is not input, within a certain period of time.
- the present invention for example, it is detected that a certain stage number signal has passed through the logic gate in the test ring oscillator, and by detecting the number of signal passing stages of the logic gate in the reference ring oscillator at this timing, Since the degree of deterioration of the test ring oscillator, that is, the degree of deterioration of the logic gate constituting the test ring oscillator can be diagnosed, the aging deterioration diagnosis apparatus of the present invention can have a simple configuration.
- measurement in a short time can be realized with a simple configuration without being substantially affected by the environment when measuring the progress of performance deterioration of a semiconductor integrated circuit.
- FIG. 10 is a block diagram illustrating a configuration of an aging deterioration diagnosis apparatus according to a fifth embodiment.
- FIG. 1 is a block diagram showing a configuration of an aging deterioration diagnosis apparatus according to Embodiment 1 of the present invention.
- the aging deterioration diagnosis apparatus according to the present embodiment includes a reference ring oscillator 101, a test ring oscillator 102, a comparison unit 103, a load unit 104, and a control unit 105.
- the aging deterioration diagnosis apparatus of the present embodiment includes a test ring oscillator 102 as a first ring oscillator and a reference ring oscillator 101 as a second ring oscillator.
- the aging deterioration diagnosis apparatus of this embodiment can be configured as an aging deterioration diagnosis circuit. This premise is the same in all the following embodiments.
- the test ring oscillator 102 is configured by connecting a plurality of and odd (arbitrary design items) logic gates configured by using a CMOS circuit in a plurality of stages. That is, a signal is circulated internally by sequentially connecting inputs and outputs of a plurality of odd-numbered logic gates. If attention is paid to a certain node, signal transition is repeated periodically. At this time, the plurality of logic gates are preferably of the same type.
- the reference ring oscillator 101 forms a ring oscillator by using a plurality of and an odd number of logic gates having the same configuration as the logic gate constituting the test ring oscillator.
- the logic gate having the same configuration means a logic gate configured by CMOS circuits having the same design.
- the number of logic gates used to configure the ring oscillator is not particularly limited, but is preferably the same as the number of test ring oscillators 102. In this way, the configuration of the test ring oscillator 102 and the reference ring oscillator 101 can be made as equal as possible, and the accuracy of the deterioration degree measurement can be improved.
- the load unit 104 is configured to input a load signal to the test ring oscillator 102.
- this load signal By the input of this load signal, the deterioration of a plurality of logic gates constituting the test ring oscillator 102 can be advanced.
- it is not particularly limited as a load signal, for example, in order to simulate the progress of deterioration due to the actual operation of a functional circuit in a semiconductor chip that is equipped with a diagnostic circuit, the deterioration is advanced using a main clock signal or the like. can do.
- the load unit 104 is inputting a load signal to the test ring oscillator 102, the reference ring oscillator 101 is not stressed, for example, the power supply terminal is connected to GND. In this state, the logic gate constituting the reference ring oscillator 101 hardly deteriorates.
- the control unit 105 is configured to simultaneously input a control signal instructing start of oscillation of the reference ring oscillator 101 and the test ring oscillator 102 to the reference ring oscillator 101 and the test ring oscillator 102.
- the comparison unit 103 is configured to compare the difference in the amount of pulse movement within each of the reference ring oscillator 101 and the test ring oscillator 102 within the same time.
- the means for comparing the difference in the movement amount of the pulse is not particularly limited, but the following means may be used.
- the comparison unit 103 causes the logic that the pulse forms the reference ring oscillator 101. It detects that the gate has passed a predetermined number of stages (a predetermined number of logic gates). Then, using this detection as a trigger, the state in the test ring oscillator 102, that is, how many stages the pulse has passed through the logic gate in the test ring oscillator 102 is detected.
- the comparison unit 103 detects the above-described detection result (the number of stages in which the pulse has passed through the logic gate in the test ring oscillator 102) and the above-described predetermined number of stages (the pulse is in the reference ring oscillator 101).
- the difference in the amount of pulse movement between the reference ring oscillator 101 and the test ring oscillator 102 within the same time is compared using the number of stages that have passed through the logic gate.
- the above-described means even if the reference ring oscillator 101 and the test ring oscillator 102 are interchanged, that is, the logic gates that constitute the test ring oscillator 102 have a predetermined number of stages (specified number).
- the number of logic gates is detected, and this detection is used as a trigger to detect the state in the reference ring oscillator 101, that is, how many stages the pulse has passed through the logic gate in the reference ring oscillator 101. Similarly, the difference in the amount of pulse movement between the reference ring oscillator 101 and the test ring oscillator 102 can also be compared.
- the ratio is the reciprocal of the ratio of the delay time per stage of each logic gate. It becomes. Since the difference in the delay time of the logic gates is caused by the presence or absence of deterioration, the state of deterioration over time can be obtained as a rate of increase in delay time.
- each of the reference ring oscillator 101 and the test ring oscillator 102 has a logic gate to which a control signal is directly input from the control unit 105 as a first logic gate, and a logic gate to which an output signal of the Nth logic gate is input.
- the comparison unit 103 A first counter that counts the number of pulses of the output signal of the Mth logic gate of the test ring oscillator 102; A second counter that counts the number of pulses of the output signal of the Mth logic gate of the reference ring oscillator 101; At least two first storage units respectively storing signals output by at least two of the plurality of logic gates constituting the test ring oscillator 102; A second storage unit to which the count value of the first counter is input,
- the second counter can be realized by adding a configuration for outputting a signal for storing data to the first storage unit and the second storage unit when a predetermined number is counted as a trigger. it can.
- the comparison unit 103 includes a plurality of first storage units that store signals output from all the logic gates constituting the test ring oscillator 102 at that time, instead of the first storage unit described above. You may comprise. In such a configuration, if the number of stages of the logic gates constituting each of the reference ring oscillator 101 and the test ring oscillator 102 is known, the comparison unit 103 determines how many stages the logic gates in each ring oscillator have. It is possible to calculate whether it has passed.
- the aging deterioration diagnosis apparatus of this embodiment does not measure the oscillation frequency of the ring oscillator, but measures how much the pulse has moved in the ring oscillator, that is, how many stages the logic gates constituting the ring oscillator have passed. And In this respect, it is different from the conventional method.
- the aging deterioration diagnosis apparatus of the present embodiment uses the reference ring oscillator 101, the test ring oscillator 102, and two ring oscillators, and the amount of pulse movement in a state in which the timings from the start to the end of these oscillations coincide with each other. Therefore, even if an environmental change (power supply voltage or temperature) is received, both the reference ring oscillator 101 and the test ring oscillator 102 are similarly affected. Therefore, the influence of noise is almost canceled at the stage of comparing the difference in pulse movement amount between the reference ring oscillator 101 and the test ring oscillator 102.
- FIG. 2 illustrates a specific configuration example of the reference ring oscillator 101, the test ring oscillator 102, the comparison unit 103, the load unit 104, and the control unit 105 illustrated in FIG. 1 and a connection method thereof. It should be noted that elements and descriptions that are not necessary for the description are omitted as appropriate, and it is obvious that the present invention is not limited to the only configuration that can achieve the object of the present invention. The premise is the same for the other embodiments.
- NAND gates can be used as the logic gates constituting the reference ring oscillator 201 and the test ring oscillator 202.
- the reference ring oscillator 201 and the test ring oscillator 202 have a configuration in which the same number of NAND gates having the same configuration are used and connected to the same number of stages.
- the reference ring oscillator 201 and the test ring oscillator 202 are configured to be able to control oscillation by the same control signal from the control unit 205. With this configuration, the reference ring oscillator 201 and the test ring oscillator 202 can simultaneously start oscillation.
- the test ring oscillator 202 is further provided with a load signal input from the load unit 204 so that an arbitrary deterioration environment can be created.
- the comparison unit 203 can be realized by a combination of a counter circuit and a flip-flop circuit, for example.
- the counter circuit 208 is connected to input an output signal of a logic gate among a plurality of logic gates constituting the reference ring oscillator 201. When an arbitrary set value is counted, the counter circuit 208 is triggered by High or It is configured to output a Low signal. This output signal is input to flip-flop circuits 206 and 207 described below, and the flip-flop circuits 206 and 207 use this input signal to store the data stored at that time.
- logic gates to which a control signal is directly input from the control unit 205 are first logic gates 201A and 202A.
- the logic gate to which the output signal of the N logic gate is input is the (N + 1) th logic gate
- the counter circuit 208 is connected to receive the output signal of the Mth logic gate of the reference ring oscillator 201
- the counter circuit 209 is connected so that the output signal of the Mth logic gate among the plurality of logic gates constituting the test ring oscillator 202 is inputted.
- the counter circuit 209 is configured to output a count value to the flip-flop circuit 206.
- the number of bits of the counter circuit 209 is an arbitrary design matter, and the flip-flop circuit 206 is provided in the same number as the number of bits of the counter circuit 209.
- the flip-flop circuit 206 stores a value using the output signal from the counter circuit 208.
- the flip-flop circuit 207 is connected between all the logic gate stages of the test ring oscillator 202, and a plurality of flip-flop circuits 207 are provided so that all the logic gates store the signals output at that time. Note that the flip-flop circuit 207 does not necessarily need to store the signals output by all the logic gates at that time. If the flip-flop circuit 207 is provided so that at least two logic gates store the signals output at that time, the flip-flop circuit 207 is used for testing. The degree of deterioration of the ring oscillator 202 can be detected. However, in order to measure the progress of the aging deterioration of the test ring oscillator 202 with higher accuracy, as shown in FIG.
- a plurality of flip-flops are used so that all the logic gates store respective signals output at that time. It is desirable to provide a circuit 207.
- the flip-flop circuit 207 stores a value using the output signal from the counter circuit 208. Note that the illustrated flip-flop circuit 207 is a part of the flip-flop circuit of this configuration example.
- the load unit 204 adds a load signal (such as a trunk clock signal) to the test ring oscillator 202 for a predetermined time, and advances the deterioration of the logic gates constituting the test ring oscillator 202.
- the reference ring oscillator 201 is in a state in which, for example, a power supply terminal is connected to GND. In this state, the logic gate constituting the reference ring oscillator 201 hardly deteriorates.
- the control unit 205 inputs a control signal instructing the start of oscillation simultaneously to the reference ring oscillator 201 and the test ring oscillator 202.
- the counter circuit 208 counts the number of pulses of the signal input to the first logic gate 201A of the reference ring oscillator 201.
- the counter circuit 209 counts the number of pulses of the signal input to the first logic gate 202 A of the test ring oscillator 202 and outputs the count value to the flip-flop circuit 206.
- Each flip-flop circuit 206 stores a value of “High” or “Low”, and the count value of the counter circuit 209 at that time is specified by the value stored in all the flip-flop circuits 206.
- the flip-flop circuit 207 stores the output signal (High or Low) at that time of each logic gate of the test ring oscillator 202.
- a signal (High or Low) for data storage is output to the flip-flop circuits 206 and 207 using that as a trigger.
- the flip-flop circuits 206 and 207 use this signal to store the value (High or Low) stored at that time.
- the calculation unit (not shown) of the comparison unit 203 collects the values (count number) stored in the flip-flop circuit 206 and identifies the count number. Further, the values (High or Low) stored in the respective flip-flop circuits 207 are collected so as to be identifiable as the output signals of the Mth logic gate. Then, by identifying the boundary between “High” and “Low” of the value (High or Low) stored in each of the plurality of flip-flop circuits 207 (eg, between the fifth logic gate and the sixth logic gate) The movement amount of the pulse in the test ring oscillator 202 at the time when the data storage signal is output from the counter circuit 208 is calculated.
- the difference in pulse movement amount between the reference ring oscillator 201 and the test ring oscillator 202 within the same time period is compared.
- the count number may be converted into the number of stages of logic gates, and the comparison may be made with the number of stages of logic gates through which pulses have passed through the reference ring oscillator 201 and the test ring oscillator 202, respectively.
- the measurement time and The resolution can be controlled.
- the reference ring oscillator 201 and the test ring oscillator 202 shown in FIG. 2 are configured by X stages of logic gates.
- the counter circuit 208 uses C as a predetermined number to be counted using the signal output from the Mth logic gate, and T ref represents the delay time per stage of the logic gate in the reference ring oscillator 201.
- T deg be a delay time per stage of the logic gate in the ring oscillator 202 for use.
- T ref is a delay time per stage of the logic gate in a state where the deterioration hardly progresses
- T deg is a stage of the logic gate in a state where the deterioration has progressed by the load signal of the load unit 204. Is the delay time.
- the counter circuit 209 counts the number of pulses counted by the counter circuit 209 using the signal output from the Mth logic gate of the test ring oscillator 202 when the counter circuit 208 counts the predetermined number C.
- N be the number of gate passage stages (obtained by the flip-flop circuit 207) that cannot be obtained.
- the counter circuits 208 and 209 satisfy “N ⁇ 2X” when counting “1” when the pulse signal changes from “High” to “Low” and then becomes “High” again.
- T deg / T ref ⁇ 1 (2X ⁇ C) / (2X ⁇ C ′ + N) ⁇ 1 (2)
- N decreases, and when N becomes 0, C ′ decreases by 1, N becomes 2X, and N decreases again from there.
- the aging deterioration diagnosis apparatus is based on the first embodiment.
- differences from the first embodiment will be described. Note that description of common points is omitted.
- FIG. 3 is a block diagram showing a configuration of an aging deterioration diagnosis apparatus according to Embodiment 2 of the present invention.
- the aging deterioration diagnosis apparatus according to the present embodiment includes a reference ring oscillator 301, a test ring oscillator 302, a comparison unit 303, a load unit 304, and a control unit 305.
- the aging deterioration diagnosis apparatus of the present embodiment is different from the first embodiment in that the reference ring oscillator 301 is used as the first ring oscillator and the test ring oscillator 302 is used as the second ring oscillator. That is, the aging deterioration diagnosis apparatus of the present embodiment has a time point when a pulse moves in the test ring oscillator 302 by a predetermined amount (for example, a time point when a counter connected to the test ring oscillator 302 counts a predetermined number in advance). ) And the movement amount of the pulse moving in the reference ring oscillator 301 is detected and compared.
- Other configurations are the same as those of the first embodiment, and the above-described processing can be realized according to the first embodiment. Therefore, detailed description here is omitted.
- the measurement time and resolution are defined by the node selection of the test ring oscillator 302, so that the measurement resolution becomes linear with respect to the first embodiment. can get.
- 2 is a connection example between the comparison unit 203 and the reference ring oscillator 201 and a connection relationship between the comparison unit 203 and the test ring oscillator 202 in the configuration example of FIG. 2 showing a specific example of the first embodiment. Can be realized by reversing.
- T ref ⁇ (2X ⁇ C '+ N) T deg ⁇ 2X ⁇ C (3)
- T deg / T ref ⁇ 1 (2X ⁇ C ′ + N) / (2X ⁇ C) ⁇ 1 (4)
- the aging deterioration diagnosis apparatus is based on the first embodiment.
- differences from the first embodiment will be described. Note that description of common points is omitted.
- FIG. 4 is a block diagram showing a configuration of an aging deterioration diagnosis apparatus according to Embodiment 3 of the present invention.
- the aging deterioration diagnosis apparatus of the present embodiment includes a reference ring oscillator 401, a test ring oscillator 402, a comparison unit 403, a load unit 404, a control unit 405, and a test final gate detection unit 410. It is a configuration.
- the aging deterioration diagnosis apparatus of the present embodiment includes a test ring oscillator 402 as a first ring oscillator and a reference ring oscillator 401 as a second ring oscillator.
- the test final gate detection unit 410 has the same number of logic gates as the reference ring oscillator 401 and the test ring oscillator 402 as the reference ring oscillator 401 and the test ring oscillator 402. Or more, it is the structure which connected them in series.
- a load signal is input from the load unit 404 to the test final gate detection unit 410 under the same conditions (the same load signal and the same time) as the test ring oscillator 402.
- the first logic gate in the test final gate detection unit 410 having a plurality of logic gates connected in series is used.
- a signal (High or Low) is input. This signal propagates through a plurality of logic gates connected in series.
- the control signal detects the number of stages passing through the logic gate to which the load signal is added, also using the amount of movement of the signal propagating through the test final gate detector 410.
- FIG. 5 is based on the specific example of the first embodiment described with reference to FIG. 2 and is different in that it has a test final gate detection unit 510.
- FIG. 5 is based on the specific example of the first embodiment described with reference to FIG. 2 and is different in that it has a test final gate detection unit 510.
- FIG. 5 is based on the specific example of the first embodiment described with reference to FIG. 2 and is different in that it has a test final gate detection unit 510.
- differences from the specific example of the first embodiment will be described.
- the description about a common point is abbreviate
- the final gate detection unit 510 for testing is configured by connecting the same number of logic gates as the test ring oscillator 502 in series.
- the load unit 504 inputs a load signal to the test ring oscillator 502 and the test final gate detection unit 510 under the same conditions.
- the output signal of the M-th logic gate of the test ring oscillator 502 is input to the flip-flop circuit 507, and also to the first logic gate 510A in the test final gate detector 510 in which a plurality of logic gates are connected in series. Entered.
- Each of the plurality of flip-flop circuits 507 receives signals input to at least two of the plurality of logic gates constituting the test final gate detection unit 510, preferably all of the logic gates.
- the information acquired from the test ring oscillator 502 by the comparison unit 503 is the same as the information acquired from the reference ring oscillator 501. Therefore, it becomes easy to align the driving loads of the reference ring oscillator 501 and the test ring oscillator 502, and high-precision measurement is realized. ⁇ Embodiment 4>
- Embodiment 4 The aging deterioration diagnosis apparatus according to Embodiment 4 is based on Embodiments 2 and 3. Hereinafter, differences from the second and third embodiments will be described. Note that description of common points is omitted.
- FIG. 6 is a block diagram showing a configuration of an aging deterioration diagnosis apparatus according to Embodiment 4 of the present invention.
- the aging degradation diagnosis apparatus of this embodiment includes a reference ring oscillator 601, a test ring oscillator 602, a comparison unit 603, a load unit 604, a control unit 605, and a reference final gate detection unit 611. It is a configuration.
- the aging deterioration diagnosis apparatus is different from the second embodiment in that it includes a reference final gate detection unit 611.
- the aging deterioration diagnosis apparatus of this embodiment is different from that of Embodiment 3 in that a reference ring oscillator 601 is provided as a first ring oscillator, and a test ring oscillator 602 is provided as a second ring oscillator.
- the reference final gate detection unit 611 can have the same configuration as the test final gate detection unit 410 (see FIG. 4) described in the third embodiment.
- the relationship between the test final gate detection unit 410 and the comparison unit 403 and the relationship between the test final gate detection unit 410 and the test ring oscillator 402 are the same as the reference final gate detection unit 611 shown in FIG. This can be realized by applying the relationship between the comparison unit 603 and the relationship between the reference final gate detection unit 611 and the reference ring oscillator 601. Therefore, detailed description here is omitted.
- FIG. 7 is a block diagram showing a configuration of an aging deterioration diagnosis apparatus according to Embodiment 5 of the present invention.
- the aging deterioration diagnosis apparatus of this embodiment includes a reference ring oscillator 701, a test ring oscillator 702, a comparison unit 703, a load unit 704, a control unit 705, and a test final gate detection unit 710.
- the final gate detection unit 711 is used. That is, it is a structure which can implement
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Abstract
Description
<実施形態1>
すなわち、参照用リング発振器101および試験用リング発振器102それぞれの、制御部105から制御信号を直接入力される論理ゲートを第1論理ゲートとし、第N論理ゲートの出力信号を入力される論理ゲートを第N+1論理ゲートとした場合、
比較部103は、
試験用リング発振器102の第M論理ゲートの出力信号のパルス数をカウントする第1カウンタと、
参照用リング発振器101の第M論理ゲートの出力信号のパルス数をカウントする第2カウンタと、
試験用リング発振器102を構成する複数の論理ゲートのうち少なくとも2つがその時に出力している信号をそれぞれ記憶する少なくとも2つの第1記憶部と、
第1カウンタのカウント値が入力される第2記憶部と、を有し、
第2カウンタは、あらかじめ定められた所定数をカウントすると、それをトリガに、第1記憶部および第2記憶部に対してデータ保存のための信号を出力する構成を加えることで実現することができる。
なお、比較部103は、上述の第1記憶部のかわりに、試験用リング発振器102を構成するすべての論理ゲートがその時に出力している信号をそれぞれ記憶する複数の第1記憶部を有するように構成してもよい。このような構成において、参照用リング発振器101および試験用リング発振器102それぞれを構成する論理ゲートの段数を把握しておけば、比較部103は、パルスがそれぞれのリング発振器内の論理ゲートを何段通過したかを算出することができる。
<実施形態2>
<実施形態3>
<実施形態4>
<実施形態5>
Claims (7)
- CMOS回路を用いて構成した複数かつ奇数個の論理ゲートを用いてリング発振器を構成した第1リング発振器と、
前記論理ゲートと同じ構成の論理ゲートを複数かつ奇数個用いてリング発振器を構成した第2リング発振器と、
前記第1リング発振器または前記第2リング発振器に対して負荷信号を入力する負荷部と、
前記第1リング発振器および前記第2リング発振器の発振開始を指示する制御信号を、前記第1リング発振器および前記第2リング発振器に対して同時に入力する制御部と、
同一時間内における、前記第1リング発振器および前記第2リング発振器それぞれ内のパルスの移動量の差を比較するための比較部と、
を有する経年劣化診断装置。 - 請求項1に記載の経年劣化診断装置において、
前記第2リング発振器は、第1リング発振器と同数の前記論理ゲートを用いてリング発振器を構成している経年劣化診断装置。 - 請求項2に記載の経年劣化診断装置において、
前記第1リング発振器および前記第2リング発振器それぞれの、前記制御部から前記制御信号を直接入力される論理ゲートを第1論理ゲートとし、第N論理ゲートの出力信号を入力される論理ゲートを第N+1論理ゲートとした場合、
前記比較部は、
前記第1リング発振器の第M論理ゲートの出力信号のパルス数をカウントする第1カウンタと、
前記第2リング発振器の第M論理ゲートの出力信号のパルス数をカウントする第2カウンタと、
前記第1リング発振器を構成する前記複数の論理ゲートのうち少なくとも2つがその時に出力している信号をそれぞれ記憶する少なくとも2つの第1記憶部と、
前記第1カウンタのカウント値が入力される第2記憶部と、
を有し、
前記第2カウンタは、あらかじめ定められた所定数をカウントすると、それをトリガに、前記第1記憶部および前記第2記憶部に対してデータ保存のための信号を出力する経年劣化診断装置。 - 請求項3に記載の経年劣化診断装置において、
前記比較部は、
前記第1リング発振器を構成するすべての前記論理ゲートがその時に出力している信号をそれぞれ記憶する複数の第1記憶部を有する経年劣化診断装置。 - CMOS回路を用いて構成した複数かつ奇数個の論理ゲートを用いてリング発振器を構成した第1リング発振器、または、前記論理ゲートと同じ構成の論理ゲートを複数かつ奇数個用いてリング発振器を構成した第2リング発振器に対して負荷信号を入力するステップと、
前記第1リング発振器および前記第2リング発振器の発振開始を指示する制御信号を、前記第1リング発振器および前記第2リング発振器に対して同時に入力するステップと、
同一時間内における、前記第1リング発振器および前記第2リング発振器それぞれ内のパルスの移動量の差を比較するステップと、
を有する経年劣化診断方法。 - 請求項5に記載の経年劣化診断方法において、
前記第2リング発振器は、前記第1リング発振器と同数の前記論理ゲートを用いてリング発振器を構成している経年劣化診断方法。 - 請求項6に記載の経年劣化診断方法において、
前記第1リング発振器および前記第2リング発振器それぞれの、前記制御信号を直接入力される論理ゲートを第1論理ゲートとし、第N論理ゲートの出力信号を入力される論理ゲートを第N+1論理ゲートとした場合、
前記パルスの移動量の差を比較するステップは、
前記第1リング発振器の第M論理ゲートの出力信号のパルス数のカウント値があらかじめ定められた所定数になると、それをトリガに、前記第2リング発振器の第M論理ゲートの出力信号のパルス数のカウント値、および、前記第2リング発振器を構成する前記複数の論理ゲートそれぞれの出力信号の値、を検知することで、前記第2リング発振器内のパルスの移動量を検知する経年劣化診断方法。
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