CN214409241U - Device for measuring and calculating board-level chip leakage current by using line impedance - Google Patents
Device for measuring and calculating board-level chip leakage current by using line impedance Download PDFInfo
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- CN214409241U CN214409241U CN202023071914.7U CN202023071914U CN214409241U CN 214409241 U CN214409241 U CN 214409241U CN 202023071914 U CN202023071914 U CN 202023071914U CN 214409241 U CN214409241 U CN 214409241U
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- 238000005259 measurement Methods 0.000 claims abstract description 25
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- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 13
- 238000005070 sampling Methods 0.000 claims description 14
- 229910044991 metal oxide Inorganic materials 0.000 claims 1
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- 238000012360 testing method Methods 0.000 description 4
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Abstract
The utility model provides a simple structure, with low costs, easily integrated and can the accurate measurement measure utilize circuit impedance to calculate the device of board level chip leakage current. The utility model discloses the device includes for the power of awaiting measuring product (1) provides load current's electronic load module (2), to the voltage value that records between two measuring points that set up on the product (1) that awaits measuring amplify and come from to voltage measurement module (4) send signal voltage amplification module (3) and receipt voltage amplification module (4) of voltage amplification module (3) and survey voltage measurement module (4) of the voltage value between two measuring points that set up on the product (1) that awaits measuring, the input of electronic load module (2) is connected with a measuring point that sets up on the product (1) that awaits measuring, this measuring point with the negative input pole of voltage amplification module (3) is connected. The utility model discloses can be applied to and measure the field.
Description
Technical Field
The utility model relates to a measure the field, especially relate to an utilize line impedance to measure and calculate device of board level chip leakage current.
Background
In the modern times, electronic technologies are rapidly developed, electronic products are increasingly innovated and changed, and the endurance requirement of users on the electronic products is higher and higher, but the battery capacity is far from keeping up with the requirements of users. Accurate measurement and control of power consumption of various components of the circuit board becomes particularly important.
The leakage current existing in some pins of the chip may affect the accurate measurement of the current of some power consumption circuit, and the leakage current is not negligible in the current measurement of this part, so the magnitude of the leakage current must be accurately measured by some means to ensure the accurate measurement and calculation of the power consumption circuit.
At present, the leakage current test mostly adopts measuring instruments such as a leakage tester or a DMM (digital multimeter), an SMU (source measurement unit) and the like, and the leakage of components and parts can be tested through the measuring instruments, but the instruments have high cost and large volume, are difficult to integrate, and are not easy to popularize in mass production. In addition, the complex circuit of the board level is restricted by the test condition and can not measure some specific leakage current, and the instrument can not solve the problem of leakage current test in the specific situation. And this difficulty is increasingly encountered during testing. To solve this problem, it is desirable to design a device that is simple, low cost, easy to integrate, and capable of accurately measuring leakage current.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that overcome prior art not enough, provide a simple structure, with low costs, easily integrated and can the accurate measurement measure the device that utilizes line impedance to calculate board level chip leakage current of leakage current.
Utilize line impedance to calculate the technical scheme that device adopted of board level chip leakage current is: the device comprises an electronic load module for providing load current for a power supply of a product to be tested,
a voltage amplification module for amplifying a voltage value measured between two measurement points provided on a product to be measured and transmitting a signal to the voltage measurement module, and
a voltage measuring module for receiving the signal from the voltage amplifying module and measuring the voltage value between two measuring points arranged on the product to be measured,
the input end of the electronic load module is connected with a measuring point arranged on a product to be measured, and the measuring point is connected with the negative input electrode of the voltage amplification module.
Further, the electronic load module comprises a direct current power supply, an operational amplifier comparator, a current-limiting resistor, a power MOS tube and a sampling resistor, wherein the positive electrode of the direct current power supply is connected with the positive input electrode of the operational amplifier comparator, the output electrode of the operational amplifier comparator is connected with one end of the current-limiting resistor, the other end of the current-limiting resistor is connected with the grid electrode of the power MOS tube, the source electrode of the power MOS tube is connected with one end of the sampling resistor, the other end of the sampling resistor is grounded, the source electrode of the power MOS tube is connected with the connection point of the sampling resistor, the negative input electrode of the operational amplifier comparator is communicated, and the drain electrode of the power MOS tube is connected with a measurement point arranged on a product to be measured.
Still further, the voltage amplification module comprises an operational amplifier, the positive and negative input poles of the operational amplifier are respectively connected with two measuring points arranged on a product to be measured, and the output pole of the operational amplifier is connected with the voltage measurement module.
The voltage measurement module is an ADC module.
The utility model has the advantages that: different from the traditional mode of directly measuring by adopting expensive instruments, the utility model discloses utilize the circuit impedance of PCB to combine electronic load module and voltage measurement module just can estimate out the leakage current of chip, wherein electronic load module exerts load current twice respectively to the point of measurationing, and two voltage values are obtained through voltage measurement module again, and the leakage current of the product to be measured can be accurately obtained to utilize resistance calculation formula; the whole device has simple structure, and greatly reduces the cost compared with the traditional expensive instrument; and the system is easier to integrate into various systems, and the integration level and compatibility are improved. The problem of the leakage current of board level under the special scene is hardly measured to general instrument is solved, the utility model discloses the method is simple, is convenient for transplant, and the integrated level is high.
Drawings
FIG. 1 is a block diagram of a simple structure of the device of the present invention;
FIG. 2 is a schematic block diagram of a simple circuit inside a product to be tested;
fig. 3 is a simplified circuit schematic of the electronic load module.
Detailed Description
The specific embodiment of the present invention is as follows.
The device for measuring and calculating the leakage current of the board-level chip by utilizing the line impedance comprises an electronic load module 2 for providing load current for the power supply of a product 1 to be measured,
a voltage amplification module 3 for amplifying a voltage value measured between two measurement points provided on the product 1 to be measured and sending a signal to the voltage measurement module 4, and
and the voltage measuring module 4 is used for receiving the signal from the voltage amplifying module 3 and measuring the voltage value between two measuring points arranged on the product 1 to be measured. The input end of the electronic load module 2 is connected with a measuring point arranged on the product 1 to be measured, and the measuring point is connected with the negative input electrode of the voltage amplification module 3.
The voltage amplification module 3 comprises an operational amplifier 31, the positive and negative input poles of the operational amplifier 31 are respectively connected with two measuring points arranged on the product 1 to be measured, and the output pole of the operational amplifier 31 is connected with the voltage measurement module 4. The operational amplifier 31 has a device model ina 826. The voltage measuring module 4 is an ADC module. The ADC is AD7172-2 in model number.
The method of the utility model comprises the following steps.
Step a, as shown in fig. 1, the power supply part of the product 1 (DUT) that awaits measuring inside need read power consumption circuit's electric current Is, but has some electric current Ib to leak integrated circuit in the circuit for power supply part can't the accurate be that detects out, consequently will utilize the utility model discloses the method calculates out Ib, can obtain Is. Two measurement points are set in the product 1 to be measured: the method comprises the steps of setting a power supply, a power consumption circuit and an integrated circuit in a product 1 to be tested, connecting the power supply with the power consumption circuit and the integrated circuit, taking a connecting point of the power consumption circuit and the integrated circuit as a measuring point B, taking a point on a path between the connecting point of the power consumption circuit and the integrated circuit and the power supply as another measuring point A, setting line impedance between the measuring point A and the measuring point B as Rs, setting voltage between the two measuring points as Vab, and setting leakage current flowing through the integrated circuit as Ib.
Applying a load current from point B with the electronic load module 2 and denoted as I1, while measuring a voltage between AB measurement points from the voltage measurement module 4 and denoted as V1, resulting in the following equation 1:
rs = V1/(I1+ Ib) … … … … equation 1.
Step c, applying a load current from the point B by using the electronic load module 2 and recording as I2, and measuring a voltage between the points AB and recording as V2 by using the voltage measuring module 4, thereby obtaining the following equation 2:
rs = V2/(I2+ Ib) … … … … equation 2.
And d, combining the equation 1 obtained in the step b with the equation 2 obtained in the step c, and finally measuring and calculating the leakage current Ib as follows:
Ib=(V1*I2-V2*I1)/(V2-V1)。
the device of the utility model is simple in structure, with low costs, easily integrated, to the measuring and calculating method of chip electric current adoption front end pin leakage current, can the accurate electric leakage of calculating microampere level. And the utility model discloses the principle is simple, is convenient for transplant and large-scale production.
Claims (4)
1. A device for measuring and calculating board-level chip leakage current by using line impedance is characterized in that: the device comprises
An electronic load module (2) for providing a load current for a power supply of a product (1) to be tested,
a voltage amplification module (3) for amplifying the voltage value measured between two measurement points arranged on the product (1) to be measured and sending a signal to the voltage measurement module (4), and
a voltage measuring module (4) for receiving the signal from the voltage amplifying module (3) and measuring the voltage value between two measuring points arranged on the product (1) to be measured,
the input end of the electronic load module (2) is connected with a measuring point arranged on the product (1) to be measured, and the measuring point is connected with the negative input electrode of the voltage amplification module (3).
2. The apparatus of claim 1, wherein the circuit impedance is used to measure the board level chip leakage current, and the apparatus further comprises: the electronic load module (2) comprises a direct current power supply (21), an operational amplifier comparator (22), a current-limiting resistor (23), a power MOS (metal oxide semiconductor) tube (24) and a sampling resistor (25), the positive electrode of the direct current power supply (21) is connected with the positive input electrode of the operational amplifier comparator (22), the output electrode of the operational amplifier comparator (22) is connected with one end of the current limiting resistor (23), the other end of the current limiting resistor (23) is connected with the grid electrode of the power MOS tube (24), the source electrode of the power MOS tube (24) is connected with one end of the sampling resistor (25), the other end of the sampling resistor (25) is grounded, the source electrode of the power MOS tube (24) is communicated with the connecting point of the sampling resistor (25) and the negative input electrode of the operational amplifier comparator (22), and the drain electrode of the power MOS tube (24) is connected with a measuring point arranged on the product (1) to be measured.
3. The apparatus of claim 1, wherein the circuit impedance is used to measure the board level chip leakage current, and the apparatus further comprises: the voltage amplification module (3) comprises an operational amplifier (31), the positive input pole and the negative input pole of the operational amplifier (31) are respectively connected with two measuring points arranged on a product (1) to be measured, and the output pole of the operational amplifier (31) is connected with the voltage measurement module (4).
4. The apparatus of claim 3, wherein the circuit impedance is used to measure the board level chip leakage current, and the apparatus further comprises: the voltage measuring module (4) is an ADC module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023071914.7U CN214409241U (en) | 2020-12-18 | 2020-12-18 | Device for measuring and calculating board-level chip leakage current by using line impedance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023071914.7U CN214409241U (en) | 2020-12-18 | 2020-12-18 | Device for measuring and calculating board-level chip leakage current by using line impedance |
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| CN214409241U true CN214409241U (en) | 2021-10-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557956A (en) * | 2020-12-18 | 2021-03-26 | 珠海市运泰利自动化设备有限公司 | Device and method for measuring and calculating board-level chip leakage current by using line impedance |
| CN119395358A (en) * | 2024-12-31 | 2025-02-07 | 艾德克斯电子（南京）有限公司 | An input voltage detection device in an electronic load |
-
2020
- 2020-12-18 CN CN202023071914.7U patent/CN214409241U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557956A (en) * | 2020-12-18 | 2021-03-26 | 珠海市运泰利自动化设备有限公司 | Device and method for measuring and calculating board-level chip leakage current by using line impedance |
| CN119395358A (en) * | 2024-12-31 | 2025-02-07 | 艾德克斯电子（南京）有限公司 | An input voltage detection device in an electronic load |
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