CN111366874A - Electric leakage detection circuit, electric leakage detection device and electric leakage detection method for flash memory - Google Patents
Electric leakage detection circuit, electric leakage detection device and electric leakage detection method for flash memory Download PDFInfo
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- CN111366874A CN111366874A CN201811595636.XA CN201811595636A CN111366874A CN 111366874 A CN111366874 A CN 111366874A CN 201811595636 A CN201811595636 A CN 201811595636A CN 111366874 A CN111366874 A CN 111366874A
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Abstract
The invention discloses a leakage detection circuit, a leakage detection device of a flash memory and a leakage detection method, wherein the leakage detection circuit comprises a detection input end, a detection output end, a first capacitor, a second capacitor, a first switch unit, a second switch unit, a power input end, a voltage division unit and a comparison unit; the first end of the first capacitor is electrically connected with the detection input end, and the second end of the first capacitor is electrically connected with the first input end of the comparison unit; the first end of the second capacitor is electrically connected with the first input end of the comparison unit, and the second end of the second capacitor is grounded; the first end of the first switch unit is electrically connected with the power supply input end, and the second end of the first switch unit is electrically connected with the first end of the first capacitor; the first end of the second switch unit is electrically connected with the first output end of the voltage division unit, and the second end of the second switch unit is electrically connected with the second end of the first capacitor; the second output end of the voltage division unit is electrically connected with the second input end of the comparison unit; the output end of the comparison unit is electrically connected with the detection output end. The leakage current of the circuit to be detected can be conveniently and efficiently detected.
Description
Technical Field
The present invention relates to leakage detection technologies, and in particular, to a leakage detection circuit, a leakage detection device for a flash memory, and a leakage detection method.
Background
With the rapid development of semiconductor and other technologies, the method has a very important role in detecting leakage current in some precision devices, such as a flash memory, and can mark a bad block in the flash memory in time to prevent data from being written into the bad block.
As the size of the flash memory chip is smaller and smaller, and the intervals between the corresponding word lines and the word lines and between the word lines and the substrate are smaller, the prior art cannot accurately detect the leakage between the word lines and the sub-lines and between the word lines and the substrate.
Disclosure of Invention
The invention provides a leakage detection circuit, a leakage detection device of a flash memory and a leakage detection method, which are used for conveniently and efficiently detecting leakage current of a circuit to be detected.
In a first aspect, an embodiment of the present invention provides an electrical leakage detection circuit, where the electrical leakage detection circuit includes: the circuit comprises a detection input end, a detection output end, a first capacitor, a second capacitor, a first switch unit, a second switch unit, a power input end, a voltage division unit and a comparison unit;
the voltage division unit comprises an input end, a first output end and a second output end, and divides the voltage input by the input end into a first output end and a second output end and outputs the voltage;
the first end of the first capacitor is electrically connected with the detection input end, and the second end of the first capacitor is electrically connected with the first input end of the comparison unit;
the first end of the second capacitor is electrically connected with the first input end of the comparison unit, and the second end of the second capacitor is grounded;
the first end of the first switch unit is electrically connected with a power supply input end, and the second end of the first switch unit is electrically connected with the first end of the first capacitor;
the first end of the second switch unit is electrically connected with the first output end of the voltage division unit, and the second end of the second switch unit is electrically connected with the second end of the first capacitor;
the second output end of the voltage division unit is electrically connected with the second input end of the comparison unit;
and the output end of the comparison unit is electrically connected with the detection output end.
Optionally, the voltage output by the first output terminal of the voltage dividing unit is greater than the voltage output by the second output terminal.
Optionally, the voltage dividing unit includes a plurality of resistors connected in series between an input end and a ground end thereof;
two of the common connection ends of different resistors are respectively used as a first output end and a second output end of the voltage division unit.
Optionally, the first switch unit adopts a first transistor, a first pole of the first transistor is used as a first end of the first switch unit, a second pole of the first transistor is used as a second end of the first switch unit, and the first transistor can control the connection or disconnection between the first pole and the second pole according to a signal of a control pole of the first transistor.
Optionally, the second switch unit adopts a second transistor, a first pole of the second transistor is used as a first end of the second switch unit, a second pole of the second transistor is used as a second end of the second switch unit, and the second transistor can control the connection or disconnection between the first pole and the second pole according to a signal of a control pole.
Optionally, the comparison unit adopts a first comparator, a first input end of the first comparator is used as a first input end of the comparison unit, a second input end of the first comparator is used as a second input end of the comparison unit, and an output end of the first comparator is used as an output end of the comparison unit.
In a second aspect, an embodiment of the present invention further provides a leakage detection device for a flash memory, including any one of the leakage detection circuit and the flash memory;
the power input end of the electric leakage detection circuit is electrically connected with the pump voltage output end of the flash memory, and the detection input end of the electric leakage detection circuit is electrically connected with the row decoder of the flash memory.
Optionally, the flash memory comprises a charge pump and a second comparator; the voltage division unit further comprises a third output end;
a third output end of the voltage division unit is electrically connected with a first input end of the second comparator, and a second input end of the second comparator is used for inputting a reference voltage;
the output end of the second comparator is electrically connected with the input end of the charge pump, and the output end of the charge pump is used as the pump voltage output end of the flash memory.
In a third aspect, an embodiment of the present invention further provides a leakage detection method based on the above leakage detection device for a flash memory, where the leakage detection method includes:
controlling the first switch unit and the second switch unit to be conducted, and charging the first capacitor and the second capacitor by a pump voltage output end;
and controlling the first switch unit and the second switch unit to be switched off, and recording the time from the switching-off of the first switch unit to the overturning of the output signal at the output end of the comparison unit as the detection time.
Optionally, the recording, as the detection time, the time elapsed from the turning off of the first switching unit to the inversion of the output signal at the output end of the comparing unit further includes:
and if the detection time is less than the preset time, marking the block currently selected by the row decoder as a bad block.
According to the invention, by adopting the electric leakage detection circuit comprising the detection input end, the detection output end, the first capacitor, the second capacitor, the first switch unit, the second switch unit, the power input end, the voltage division unit and the comparison unit, the magnitude of the electric leakage current is judged according to the turning time of the output signal of the comparison unit, and the detection efficiency and the accuracy are higher.
Drawings
Fig. 1 is a schematic structural diagram of a leakage detection circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit structure diagram of a leakage detection circuit according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of another leakage detection circuit according to an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of another leakage detection circuit according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a leakage detection device for a flash memory according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of another leakage detection device for a flash memory according to an embodiment of the present invention;
fig. 7 is a flowchart of a leakage detection method according to an embodiment of the present invention;
fig. 8 is a flowchart of another leakage detection method according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Examples
Fig. 1 is a schematic structural diagram of a leakage detection circuit according to an embodiment of the present invention, and referring to fig. 1, the leakage detection circuit includes a detection input terminal IN, a detection output terminal OUT, a first capacitor 101, a second capacitor 102, a first switch unit 103, a second switch unit 104, a power input terminal VP, a comparison unit 105, and a voltage division unit 106;
the voltage dividing unit 106 includes an input end, a first output end and a second output end, and the voltage dividing unit 106 is configured to divide the voltage input by the input end and output the divided voltage from the first output end and the second output end respectively;
a first end of the first capacitor 101 is electrically connected to the detection input terminal IN, and a second end of the first capacitor 101 is electrically connected to the first input terminal V1 of the comparison unit 105;
a first end of the second capacitor 102 is electrically connected to the first input terminal V1 of the comparing unit 105, and a second end of the second capacitor 102 is grounded;
a first end of the first switch unit 103 is electrically connected to the power input terminal VP, and a second end of the first switch unit 103 is electrically connected to a first end of the first capacitor 101;
a first end of the second switch unit 104 is electrically connected to a first output end of the voltage dividing unit 106, and a second end of the second switch unit 104 is electrically connected to a second end of the first capacitor 101;
a second output terminal of the voltage dividing unit 106 is electrically connected with a second input terminal V2 of the comparing unit 105;
an output terminal of the comparing unit 105 is electrically connected to the detection output terminal OUT.
The voltage output by the first output terminal of the voltage dividing unit 106 is greater than the voltage output by the second output terminal thereof.
Specifically, after the input terminal IN of the leakage detection circuit is connected to the circuit to be detected, the first switch unit 103 and the second switch unit 104 are controlled to be closed, the power input terminal VP inputs the power signal, at this time, the power signal input from the power input terminal VP charges the first capacitor 101 through the first switch unit 103, and charges the second capacitor 102 through the first output terminal of the voltage division unit 106 and the second switch unit 104, meanwhile, the voltages of the first input terminal V1 and the second input terminal V2 of the comparison unit 105 are different, for example, the voltage of the first input terminal V1 of the comparison unit 105 is greater than the voltage of the second input terminal V2, and the output terminal of the comparison unit 105 outputs a high level; then, both the first switch unit 103 and the second switch unit 104 are turned on, if there is leakage current in the circuit to be tested, the leakage current will cause the charges of the first capacitor 101 and the second capacitor 102 to drain, and thus cause the voltage of the first input terminal V1 of the comparison unit 105 to drop, until the input voltage of the first input terminal V1 of the comparison unit 105 is reduced to the input voltage of the second input terminal V2, the output terminal of the comparison unit is flipped from high level to low level, and the time required from the turning on of the first switch unit 103 and the second switch unit 104 to the flipping of the output signal of the output terminal of the comparison unit 105 is recorded as the detection time. Comparing the detection time with the preset time, if the detection time is less than the preset time, it indicates that the charge discharge of the first capacitor 103 and the second capacitor 104 is faster, i.e. the leakage current in the circuit to be detected is larger, and if the detection time is not less than the preset time, it indicates that the charge discharge of the first capacitor 103 and the second capacitor 104 is slower, and the leakage current in the circuit to be detected is smaller. It is understood that the preset time may be set according to the type of the circuit to be detected or the leakage current detection standard, which is not specifically limited in this embodiment.
According to the technical scheme, the leakage detection circuit comprises the detection input end, the detection output end, the first capacitor, the second capacitor, the first switch unit, the second switch unit, the power input end, the voltage division unit and the comparison unit, the size of leakage current is judged according to the turning time of the output signal of the comparison unit, and the detection efficiency and the accuracy are high.
Optionally, referring to fig. 2, fig. 2 is a schematic circuit structure diagram of a leakage detection circuit according to an embodiment of the present invention, wherein the voltage dividing unit 106 includes a plurality of resistors connected in series between an input terminal and a ground terminal thereof;
two of the common connection terminals of the different resistors are respectively used as a first output terminal and a second output terminal of the voltage dividing unit 106.
Illustratively, referring to fig. 2, the voltage dividing unit 106 includes a plurality of resistors Rm +1, Rm, … … Rn +1, … …, and R0, wherein a common connection terminal between R0 and R1 is used as the second output terminal of the voltage dividing unit 106, and a common connection terminal of two adjacent resistors Rm and Rn +1 is used as the first output terminal of the voltage dividing unit 106. Different detection standards can be provided for different circuits to be detected, the positions of the first output end and the second output end of the voltage division unit 106 can be set, and the application range of the leakage detection circuit can be more flexible as long as the output voltage of the first output end of the voltage division unit 106 is larger than that of the second output end.
According to the technical scheme of the embodiment, the voltage division unit comprising the plurality of resistors is adopted, so that the application range of the electric leakage detection circuit is wider, and the flexibility is higher.
Alternatively, referring to fig. 3, fig. 3 is a schematic circuit structure diagram of another leakage detection circuit according to an embodiment of the present invention, the first switch unit 103 employs a first transistor P1, a first pole of the first transistor P1 is used as a first end of the first switch unit 103, a second pole of the first transistor P1 is used as a second end of the first switch unit 103, and the first transistor P1 can control the first pole and the second pole to be turned on or off according to a signal of a control pole thereof.
The second switch unit 104 adopts a second transistor P2, a first pole of the second transistor P2 is used as a first end of the second switch unit 104, a second pole of the second transistor P2 is used as a second end of the second switch unit 104, and the second transistor P2 can control the connection or disconnection between the first pole and the second pole according to a signal of a control pole of the second transistor P2.
Specifically, the first transistor P1 and the second transistor P2 may both be NMOS transistors, and when the circuit to be tested is a circuit including a semiconductor structure, such as a word line in a flash memory, the first switch unit 103 and the second switch unit 104 are more easily integrated with the flash memory, and the first switch unit 103 and the second switch unit 104 are more easily controlled by using transistors.
Optionally, referring to fig. 4, fig. 4 is a schematic circuit structure diagram of another leakage detection circuit according to an embodiment of the present invention, where the comparison unit 105 employs a first comparator, a first input terminal of the first comparator is used as the first input terminal V1 of the comparison unit 105, a second input terminal of the first comparator is used as the second input terminal V2 of the comparison unit 105, and an output terminal of the first comparator is used as the output terminal of the comparison unit 105.
Specifically, the comparator has a function of outputting different output signals according to the magnitude of input voltages at two input ends of the comparator, for example, before the first input end of the comparator is a positive-phase input end and the second input end of the comparator is a negative-phase input end, and the first switching unit 103 and the second switching unit 104 are turned off, because the input voltage at the first input end of the first comparator is greater than the input voltage at the second input end of the first comparator, the output at the output end of the first comparator is at a high level, that is, the output at the output end OUT of the leakage detection circuit is at a high level; after the first switch unit 103 and the second switch unit 104 are both turned off, if there is leakage current in the circuit to be detected, the input voltage at the first input end of the first comparator starts to drop, and when the input voltage at the first input end of the first comparator drops to the input voltage at the second input end, the output end of the first comparator is inverted to a low level, that is, the output end OUT of the leakage detection circuit is inverted to a low level, and whether the leakage current of the circuit to be detected meets the standard can be determined according to the inversion time of the output signal at the output end of the first comparator.
Optionally, referring to fig. 5, fig. 5 is a schematic circuit structure diagram of a leakage detection device for a flash memory according to an embodiment of the present invention; the leakage detection device of the flash memory comprises any one of the leakage detection circuits and the flash memory;
the power input of the leakage detection circuit is electrically connected to the pump voltage output of the flash memory, and the detection input of the leakage detection circuit is electrically connected to the row decoder 202 of the flash memory.
Specifically, the flash memory includes a charge pump 201 and a row decoder 202, and the circuit structure of the charge pump 201 and the row decoder 202 is well known to those skilled in the art. The charge pump 201 is used for providing input voltage for the flash memory and providing voltage for the power input end of the leakage detection circuit, so that the utilization rate of components in the flash memory can be improved, and the cost is reduced. The row decoder 202 is configured to connect the leakage detection circuit to a word line in the flash memory, and if the leakage current of the word line detected by the leakage detection circuit does not meet the standard, mark a block in which the word line is located as a bad block, so as to prevent a user from writing data into the bad block and causing data loss. If the word line detects that the leakage current meets the standard through the leakage detection circuit, the other word lines in the block where the word line is located are detected through the row decoder 202, and when the leakage currents of all the word lines in the block meet the standard, the block can be marked as a normal block.
According to the technical scheme of the embodiment, the electric leakage phenomenon in the flash memory can be detected in time by adopting the electric leakage detection device comprising the electric leakage detection circuit and the flash memory, and the loss of data to users is avoided.
Optionally, referring to fig. 6, fig. 6 is a schematic circuit diagram of a leakage detection device for a flash memory according to another embodiment of the present invention;
the flash memory comprises a charge pump 201 and a second comparator 203, and the voltage division unit 106 further comprises a third output terminal;
a third output end of the voltage division unit 203 is electrically connected with a first input end of the second comparator 203, and a second input end of the second comparator 203 is used for inputting a reference voltage;
the output terminal of the second comparator 203 is electrically connected to the input terminal of the charge pump 201, and the output terminal of the charge pump 201 serves as the pump voltage output terminal of the flash memory.
Specifically, the charge pump 201 may further include a peripheral circuit formed by the second comparator 203, and configured to adjust an output voltage of the charge pump 201, where a first input end of the second comparator 203 is electrically connected to a third output end of the voltage dividing unit 106, so as to further improve utilization rate of components in the leakage detection device, and reduce cost.
Optionally, referring to fig. 7, fig. 7 is a flowchart of a leakage detection method according to an embodiment of the present invention, which is applicable to the leakage detection device of the flash memory in fig. 6, where the leakage detection method includes:
and step 302, controlling the first switch unit and the second switch unit to be switched off, and recording the time from the switching-off of the first switch unit to the overturning of the output signal at the output end of the comparison unit as detection time.
Specifically, the first switch unit and the second switch unit are turned on or off simultaneously. The working principle is the same as the detection principle in the leakage detection circuit, and the description is omitted here.
Optionally, referring to fig. 8, fig. 8 is a flowchart of another leakage detection method according to an embodiment of the present invention, which is applicable to the leakage detection apparatus of the flash memory in fig. 6, where the leakage detection method includes:
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. An electrical leakage detection circuit, comprising: the circuit comprises a detection input end, a detection output end, a first capacitor, a second capacitor, a first switch unit, a second switch unit, a power input end, a voltage division unit and a comparison unit;
the voltage division unit comprises an input end, a first output end and a second output end, and is used for dividing and outputting the voltage input by the input end from the first output end and the second output end respectively;
the first end of the first capacitor is electrically connected with the detection input end, and the second end of the first capacitor is electrically connected with the first input end of the comparison unit;
the first end of the second capacitor is electrically connected with the first input end of the comparison unit, and the second end of the second capacitor is grounded;
the first end of the first switch unit is electrically connected with a power supply input end, and the second end of the first switch unit is electrically connected with the first end of the first capacitor;
the first end of the second switch unit is electrically connected with the first output end of the voltage division unit, and the second end of the second switch unit is electrically connected with the second end of the first capacitor;
the second output end of the voltage division unit is electrically connected with the second input end of the comparison unit;
and the output end of the comparison unit is electrically connected with the detection output end.
2. The electrical leakage detection circuit of claim 1, wherein the voltage output by the first output terminal of the voltage divider is greater than the voltage output by the second output terminal.
3. The leakage detection circuit according to claim 1 or 2, wherein the voltage divider unit comprises a plurality of resistors connected in series between an input terminal thereof and a ground terminal;
two of the common connection ends of different resistors are respectively used as a first output end and a second output end of the voltage division unit.
4. The leakage detection circuit according to claim 1, wherein the first switch unit employs a first transistor, a first pole of the first transistor is used as the first end of the first switch unit, a second pole of the first transistor is used as the second end of the first switch unit, and the first transistor is capable of controlling the connection or disconnection between the first pole and the second pole according to a signal of a control pole of the first transistor.
5. The leakage detection circuit according to claim 1, wherein the second switch unit employs a second transistor, a first pole of the second transistor is used as the first terminal of the second switch unit, a second pole of the second transistor is used as the second terminal of the second switch unit, and the second transistor is capable of controlling the connection or disconnection between the first pole and the second pole according to a signal of a control pole.
6. The leakage detection circuit of claim 1, wherein the comparison unit employs a first comparator, a first input terminal of the first comparator is used as the first input terminal of the comparison unit, a second input terminal of the first comparator is used as the second input terminal of the comparison unit, and an output terminal of the first comparator is used as the output terminal of the comparison unit.
7. A leakage detection device for a flash memory, comprising the leakage detection circuit according to any one of claims 1 to 6 and a flash memory;
the power input end of the electric leakage detection circuit is electrically connected with the pump voltage output end of the flash memory, and the detection input end of the electric leakage detection circuit is electrically connected with the row decoder of the flash memory.
8. The flash memory leakage detection device of claim 7, wherein the flash memory comprises a charge pump and a second comparator; the voltage division unit further comprises a third output end;
a third output end of the voltage division unit is electrically connected with a first input end of the second comparator, and a second input end of the second comparator is used for inputting a reference voltage;
the output end of the second comparator is electrically connected with the input end of the charge pump, and the output end of the charge pump is used as the pump voltage output end of the flash memory.
9. A leakage detection method based on the leakage detection device of the flash memory of claim 7, wherein the leakage detection method comprises:
controlling the first switch unit and the second switch unit to be conducted, and charging the first capacitor and the second capacitor by a pump voltage output end;
and controlling the first switch unit and the second switch unit to be switched off, and recording the time from the switching-off of the first switch unit to the overturning of the output signal at the output end of the comparison unit as the detection time.
10. The leakage detection method according to claim 9, wherein recording an elapsed time from turning off of the first switching unit to inversion of the output signal at the output terminal of the comparison unit as the detection time further comprises:
and if the detection time is less than the preset time, marking the block currently selected by the row decoder as a bad block.
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| CN201811595636.XA CN111366874A (en) | 2018-12-25 | 2018-12-25 | Electric leakage detection circuit, electric leakage detection device and electric leakage detection method for flash memory |
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| CN201811595636.XA CN111366874A (en) | 2018-12-25 | 2018-12-25 | Electric leakage detection circuit, electric leakage detection device and electric leakage detection method for flash memory |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113342112A (en) * | 2021-06-23 | 2021-09-03 | 江苏应能微电子有限公司 | Reference voltage control device, method and electronic equipment |
| WO2021212839A1 (en) * | 2020-09-07 | 2021-10-28 | 青岛经济技术开发区海尔热水器有限公司 | Electric leakage detection circuit, electric leakage protection circuit, and household appliance |
-
2018
- 2018-12-25 CN CN201811595636.XA patent/CN111366874A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021212839A1 (en) * | 2020-09-07 | 2021-10-28 | 青岛经济技术开发区海尔热水器有限公司 | Electric leakage detection circuit, electric leakage protection circuit, and household appliance |
| CN113342112A (en) * | 2021-06-23 | 2021-09-03 | 江苏应能微电子有限公司 | Reference voltage control device, method and electronic equipment |
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