CN220154580U - Multichannel fuse trimming circuit and system with trimming capacitor array - Google Patents
Multichannel fuse trimming circuit and system with trimming capacitor array Download PDFInfo
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- 239000003990 capacitor Substances 0.000 title claims abstract description 100
- 238000007599 discharging Methods 0.000 claims abstract description 62
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- 230000000903 blocking effect Effects 0.000 claims description 12
- 238000010521 absorption reaction Methods 0.000 claims description 8
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Abstract
The utility model discloses a multichannel fuse trimming circuit with a trimming capacitor array, which comprises a power supply circuit, a charging circuit with a plurality of charging channels and a discharging circuit with a plurality of discharging channels, wherein the power supply circuit comprises an adjustable direct current stabilized power supply, each charging channel comprises a charging isolating switch and a trimming capacitor which are connected in series, and each discharging channel comprises a discharging isolating switch and a fuse which are connected in series. And when the tester works, an external tester determines fuse wire segments to be trimmed according to data of the chip to be tested, and controls the charging isolating switch and the discharging isolating switch in the corresponding charging channel and the discharging channel to act respectively through the control interface of the tester, so that charging and discharging of trimming capacitors in the corresponding charging channel are completed to trim the corresponding fuse wire segments. The multichannel fuse trimming circuit with the trimming capacitor array can trim a plurality of sections of fuses simultaneously, and has good compatibility of a chip to be trimmed and high trimming efficiency.
Description
Technical Field
The utility model belongs to the technical field of chip testing, and particularly relates to a multichannel fuse trimming circuit and system with a trimming capacitor array.
Background
In the wafer test stage after the chip is manufactured, the fuses of the chip are often required to be trimmed so as to accurately adjust the performance parameters or functions of the chip, various conventional fuse trimming methods exist, and a test engineer needs to select a proper trimming method to improve the trimming success rate, wherein in the trimming method with lower cost and higher trimming success rate, the fuses are blown or gasified through high current generated by discharging the capacitor to form open circuits, namely, the fuses are trimmed through trimming the capacitor.
When a test engineer trims a fuse of a chip by trimming a capacitor, a trimming circuit including the trimming capacitor is usually integrated on a probe card or a board of a test DUT (Device Under Test ), and the defect of this process is that: the integrated trimming circuit on the probe card or the DUT board is fixed in a connection mode, namely, fuses of one chip can only be trimmed, the trimming circuit is not compatible with other types of chips, the trimming control circuit and the test circuit are arranged together, unexpected signal interference can be caused by generated line crossing, in addition, the trimming isolation relay and other test circuit control signal switching relays are arranged on the probe card or the DUT board, the relays of the same type are difficult to be arranged together and identified, and the difficulty is increased in eliminating abnormality and faults.
Disclosure of Invention
In order to solve the technical problems, the utility model aims to provide a multichannel fuse trimming circuit with a trimming capacitor array, which comprises a power supply circuit, a charging circuit and a discharging circuit which are sequentially connected in series, wherein the power supply circuit comprises an adjustable direct-current stabilized power supply, the charging circuit is provided with a plurality of charging channels, and the discharging circuit is provided with a plurality of discharging channels; each charging channel comprises a charging isolating switch and a trimming capacitor which are connected in series, wherein a first end of the charging isolating switch is connected to the adjustable direct current stabilized power supply, a second end of the charging isolating switch is connected to a first end of the trimming capacitor, a third end of the charging isolating switch is connected to a control interface of an external tester, a second end of the trimming capacitor is grounded, and trimming capacitors in the charging channels jointly form a trimming capacitor array; each discharging channel comprises a discharging isolating switch and a fuse wire which are connected in series, wherein the first end of the discharging isolating switch is connected to the first end of the trimming capacitor, the second end of the discharging isolating switch is connected to the first end of the fuse wire, the third end of the discharging isolating switch is connected to a control interface of an external testing machine, and the second end of the fuse wire is connected to the second end of the trimming capacitor and grounded.
Further, the adjustable direct current stabilized power supply is two paths and connected in parallel.
Further, the charging isolating switch and the discharging isolating switch are respectively a charging isolating relay and a discharging isolating relay.
Further, the charge blocking switch and the discharge blocking switch are respectively a charge blocking MOSFET (MOSFET is an abbreviation of Metal Oxide Semiconductor Field Effect Transistor) and a discharge blocking MOSFET (MOSFET).
Further, each charging channel is provided with a diode, the second end of the charging isolating switch is connected to the positive electrode of the diode in series, and the negative electrode of the diode is connected to the first end of the trimming capacitor in series.
Further, each charging channel is provided with a power current-limiting resistor, the second end of the charging cut-off switch is connected to the first end of the power current-limiting resistor in series, and the second end of the power current-limiting resistor is connected to the first end of the trimming capacitor in series.
Further, each charging channel is internally provided with a diode and a power current-limiting resistor which are connected in series, the second end of the charging cut-off switch is connected to the positive electrode of the diode in series, the negative electrode of the diode is connected to the first end of the power current-limiting resistor in series, and the second end of the power current-limiting resistor is connected to the first end of the trimming capacitor in series.
Further, each charging channel is provided with a power current-limiting resistor and a diode which are connected in series, the second end of the charging cut-off switch is connected to the first end of the power current-limiting resistor in series, the second end of the power current-limiting resistor is connected to the positive electrode of the diode in series, and the negative electrode of the diode is connected to the first end of the trimming capacitor in series.
Further, an absorption capacitor for absorbing peak voltage is arranged in each discharge channel, and the absorption capacitors are connected in parallel at two ends of the fuse.
The utility model also provides a multichannel fuse trimming system with the trimming capacitor array, which comprises the multichannel fuse trimming circuit with the trimming capacitor array.
Compared with the prior art, the multichannel fuse trimming circuit with the trimming capacitor array has the following beneficial technical effects:
1) The trimming capacitor array is arranged to trim a plurality of sections of fuses simultaneously, so that fuses of various chips can be trimmed, the compatibility is good, the trimming efficiency is high, the trimming control circuit (namely an external tester) is not required to be laid out together on a probe card or a DUT board, only the same type of isolating relay exists on the probe card or the DUT board, and a relay for switching control signals in the trimming control circuit is not required to be arranged;
2) The power circuit adopts two paths of adjustable direct current stabilized power supplies which are connected in parallel, so that a user can flexibly adjust and regulate the voltage required by adjustment, and enough charging current can be provided, and the power supply stability is good;
3) The charging isolating switch and the discharging isolating switch adopt a charging isolating MOSFET and a discharging isolating MOSFET, so that the response speed is high, the response time is short, and abnormal repair and adjustment of the fuse wire such as incomplete fuse wire blowing and the like are avoided;
4) The diode is arranged in the charging channel, so that the unidirectionality of charging current in the charging channel can be ensured;
5) The power current limiting resistor is arranged in the charging channel to prevent the excessive charging current in the charging channel;
6) And an absorption capacitor for absorbing peak voltage is arranged in the discharge channel, so that the problem that the peak voltage is increased due to parasitic inductance and parasitic capacitance in the instantaneous discharge channel of the fuse is solved.
Drawings
FIG. 1 is a schematic diagram of a multi-channel fuse trimming circuit with a trimming capacitor array according to an embodiment of the utility model;
FIG. 2 is a schematic diagram showing a power circuit of a multi-channel fuse trimming circuit with a trimming capacitor array according to an embodiment of the utility model;
FIG. 3 is a schematic diagram showing a charging circuit with multiple charging channels in a multi-channel fuse trimming circuit with a trimming capacitor array according to an embodiment of the utility model;
FIG. 4 is a schematic diagram showing a discharging circuit having a plurality of discharging channels in a multi-channel fuse trimming circuit having a trimming capacitor array according to an embodiment of the utility model;
FIG. 5 is a schematic diagram showing a circuit structure of a charging channel and a discharging channel corresponding to a selected fuse segment bit to be trimmed in a multi-channel fuse trimming circuit with a trimming capacitor array according to an embodiment of the utility model;
FIG. 6 is a schematic diagram showing a circuit configuration of a second charging circuit having a plurality of charging channels in a multi-channel fuse trimming circuit having a trimming capacitor array according to an embodiment of the utility model;
FIG. 7 is a schematic circuit diagram of a third charging circuit with multiple charging channels in a multi-channel fuse trimming circuit with a trimming capacitor array according to an embodiment of the utility model;
FIG. 8 is a schematic circuit diagram of a preferred charging circuit with multiple charging channels in a multi-channel fuse trimming circuit with a trimming capacitor array according to an embodiment of the utility model;
fig. 9 is a schematic circuit diagram of a preferred discharge circuit with multiple discharge channels in a multi-channel fuse trimming circuit with a trimming capacitor array according to an embodiment of the utility model.
Detailed Description
The following detailed description of specific embodiments of the utility model should be understood that the embodiments of the utility model are not limited to the examples shown in the drawings, but rather the scope of the utility model is not limited to the specific embodiments. The use of the terms "first," "second," and the like herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another, and similarly, the terms "a," "an," or "the" and the like do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item. Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art, and further, the technical and scientific terms used herein should be interpreted as having a meaning consistent with the corresponding terms defined in commonly used technical manuals and not to be interpreted as having an idealized or overly formal sense unless expressly so defined herein.
Fig. 1 is a schematic circuit diagram of a multi-channel fuse trimming circuit with a trimming capacitor array according to an embodiment of the utility model, and referring to fig. 1, the multi-channel fuse trimming circuit includes a power circuit, a charging circuit with a plurality of charging channels, and a discharging circuit with a plurality of discharging channels, which are sequentially connected in series.
Fig. 2 shows a schematic circuit structure of a power supply circuit in the multi-channel fuse trimming circuit, which considers that the fuse trimming needs a large enough instantaneous current, so that the power supply circuit is not suitable for using a channel of an external testing machine to supply power to a trimming capacitor, and generally controls the clamping voltage of a burned fuse to be about 5V, but in practical testing, the applicant finds that fuses of some chips are more stable when trimming under other voltages, so that referring to fig. 2, the power supply circuit adopts an adjustable direct-current stabilized power supply, a user can self and flexibly adjust the voltage required by trimming to charge the trimming capacitor, and the power supply circuit can provide a large enough charging current, and also considers the power supply stability, and preferably uses two parallel adjustable direct-current stabilized power supplies, namely the adjustable direct-current stabilized power supply 1 and the adjustable direct-current stabilized power supply 2.
Fig. 3 is a schematic circuit diagram of a charging circuit having a plurality of charging channels in a multi-channel fuse trimming circuit according to an embodiment of the present utility model, referring to fig. 3, the number of charging channels is 96, each charging channel includes a charging cut-off switch and a trimming capacitor connected in series, a first end of the charging cut-off switch is connected to an adjustable dc regulated power supply of a power supply circuit, a second end of the charging cut-off switch is connected to a first end of the trimming capacitor, a third end of the charging cut-off switch is connected to a control interface of an external tester, a second end of the trimming capacitor is grounded, and trimming capacitors in the 96 charging channels together form a trimming capacitor array. After the external testing machine determines the fuse wire segment position (namely a charging channel and a discharging channel corresponding to the fuse wire) to be repaired according to the data of the chip to be tested in charging, each segment of the fuse wire is provided with one charging channel and one discharging channel in a one-to-one correspondence, a charging cut-off switch in the charging channel corresponding to the fuse wire segment position to be repaired is controlled to be closed through a control interface of the testing machine, an adjustable direct current stabilized power supply and a repairing capacitor in the corresponding charging channel are connected, the adjustable direct current stabilized power supply charges the repairing capacitor, the voltage at two ends of the repairing capacitor slowly rises, the voltage at two ends of the repairing capacitor is equal to the voltage of the adjustable direct current stabilized power supply after a period of time, the charging current becomes zero, the repairing capacitor is charged, and the external testing machine cuts off the charging cut-off switch in the charging channel corresponding to the fuse wire segment position to be repaired through a control interface of the external testing machine, so that the repairing preparation of the fuse wire is completed.
Fig. 4 is a schematic circuit diagram of a discharging circuit having a plurality of discharging channels in a multi-channel fuse trimming circuit according to an embodiment of the utility model, referring to fig. 4, for example, the number of the discharging channels is 96, each discharging channel includes a discharging cut-off switch and a fuse connected in series, a first end of the discharging cut-off switch is connected to a first end of a trimming capacitor, a second end of the discharging cut-off switch is connected to a first end of the fuse, a third end of the discharging cut-off switch is connected to a control interface of an external tester, a second end of the fuse is connected to a second end of the trimming capacitor, and a second end of the trimming capacitor is grounded. After the trimming capacitor is charged, an external tester determines the fuse wire section bit to be trimmed according to the data of the chip to be tested, a control interface of the tester is used for closing a discharge isolating switch in a discharge channel corresponding to the fuse wire section bit to be trimmed, a discharge isolating switch and a fuse wire in the corresponding discharge channel are connected to form an instantaneous heavy current discharge loop, and after tens of milliseconds, the fuse wire trimming is completed, and the external tester is used for disconnecting the discharge isolating switch in the corresponding discharge channel through the control interface of the tester.
Fig. 5 shows a schematic circuit structure of a charging channel and a discharging channel corresponding to a certain selected fuse segment bit in a multi-channel fuse trimming circuit according to an embodiment of the present utility model, an external tester closes a charging isolation switch in the charging channel through a control interface thereof, turns on an adjustable dc voltage-stabilizing transistor power supply and a trimming capacitor, the adjustable dc voltage-stabilizing transistor power supply charges the trimming capacitor, and after the trimming capacitor is fully charged, the external tester turns off a charging isolation switch in the charging channel and turns on a discharging isolation switch through a control interface thereof, turns on the fuse and the trimming capacitor, and the trimming capacitor discharges a large current instantaneously to blow the fuse.
Fig. 6 is a schematic circuit diagram of a second charging circuit having multiple charging channels in a multi-channel fuse trimming circuit according to an embodiment of the present utility model, in which, considering that the device parameters of the trimming capacitors in each charging channel are inconsistent and the charging current flows reversely, a diode is added to each charging channel to ensure the unidirectional property of the charging current, specifically, the second end of the charging isolation switch is serially connected to the anode of the diode, the cathode of the diode is serially connected to the first end of the trimming capacitor, the second end of the trimming capacitor is grounded, and the unidirectional property of the diode is used to ensure the unidirectional property of the charging current, as shown in fig. 6.
Fig. 7 shows a schematic circuit structure of a third charging circuit having multiple charging channels in a multi-channel fuse trimming circuit according to an embodiment of the present utility model, since the voltage across the trimming capacitor cannot be suddenly changed, the voltage across the trimming capacitor is zero at the moment of charging the trimming capacitor, and the charging current in the charging channel is very large, for this purpose, referring to fig. 7, a power current limiting resistor is added in each charging channel based on the charging circuit shown in fig. 3, specifically, the second end of the charging cut-off switch is serially connected to the first end of the power current limiting resistor, the second end of the power current limiting resistor is serially connected to the first end of the trimming capacitor, and the second end of the trimming capacitor is grounded, so as to limit the charging current in the charging channel through the power current limiting resistor.
Fig. 8 is a schematic circuit diagram of a preferred charging circuit with multiple charging channels in a multi-channel fuse trimming circuit according to an embodiment of the present utility model, in order to solve the problem of large charging current in the charging channels while ensuring the unidirectional charging current, referring to fig. 8, on the basis of the charging circuit shown in fig. 3, a series-connected diode and a power limiting resistor are added to each charging channel, specifically, a second end of a charging cut-off switch is connected in series to an anode of the diode, a cathode of the diode is connected in series to a first end of the power limiting resistor, a second end of the power limiting resistor is connected in series to a first end of a trimming capacitor, a second end of the trimming capacitor is grounded, and similarly, a series-connected power limiting resistor and a diode are added to each charging channel, that is, the second end of the charging cut-off switch is connected in series to the first end of the power limiting resistor, the second end of the power limiting resistor is connected in series to an anode of the diode, and the cathode of the diode is connected in series to the first end of the trimming capacitor.
Fig. 9 shows a schematic circuit structure of a preferred discharging circuit with multiple discharging channels in a multi-channel fuse trimming circuit according to an embodiment of the present utility model, where the applicant frequently encounters the condition of burning out a chip during the actual trimming process, and the analysis reason determines that parasitic inductance and parasitic capacitance exist in the discharging channels of the discharging circuit for burning out the fuse, and peak voltage may be generated to cause voltage rise, so, referring to fig. 9, on the basis of the discharging circuit shown in fig. 4, an absorption capacitor for absorbing the peak voltage is added in each discharging channel, and specifically, the absorption capacitor is connected in parallel to two ends of the fuse.
In the multi-channel fuse trimming circuit provided by the embodiment of the utility model, the charging isolating switch and the discharging isolating switch respectively adopt the charging isolating relay and the discharging isolating relay, and the trimming voltage during trimming of the fuse is considered to be influenced by the performance parameters such as response time and contact resistance of the charging isolating relay and the discharging isolating relay, and if the response time is longer, the fuse trimming is abnormal, such as incomplete fuse blowing, and the like, so that the charging isolating switch and the discharging isolating switch can also adopt the charging isolating MOSFET and the discharging isolating MOSFET, the response speed of the charging isolating switch and the discharging isolating switch is further improved, and the response time is shortened.
In summary, when the multi-channel fuse trimming circuit works, the external tester determines the fuse segments to be trimmed according to the data of the chip to be tested, and controls the charging isolating switch and the discharging isolating switch in the corresponding charging channel and discharging channel to act through the control interface of the tester, so as to complete the charging and discharging of the trimming capacitor in the corresponding charging channel, thereby trimming the corresponding fuse segments, and trimming multiple segments such as 96 segments of fuses simultaneously, further trimming the fuses of multiple chips. In addition, the multi-channel fuse trimming circuit does not need to be laid out together with a trimming control circuit (i.e., an external tester) on a probe card or DUT board, so that wireless paths intersect; finally, only the same type of isolating relay exists on the needle card or the DUT board, and a relay for switching control signals in a trimming control circuit is not required to be arranged, so that the relay on the needle card or the DUT board is easy to identify, and the difficulty in eliminating the abnormality and the fault of the relay is low.
In the multichannel fuse trimming circuit, the power supply circuit adopts two paths of adjustable direct current stabilized power supplies which are connected in parallel, so that a user can flexibly adjust and trim the voltage required by trimming, and the multichannel fuse trimming circuit can also provide enough charging current and has good power supply stability.
In the multichannel fuse trimming circuit, a charging isolating switch in the charging circuit and a discharging isolating switch in the discharging circuit respectively adopt a charging isolating MOSFET and a discharging isolating MOSFET, so that the response speed is high, the response time is short, and the fuse trimming abnormality such as incomplete fuse blowing and the like can be avoided.
In the multichannel fuse trimming circuit, the diode is arranged in the charging channel of the charging circuit, so that the unidirectional charging current in the charging channel can be ensured.
In the multichannel fuse trimming circuit, a power current limiting resistor is arranged in a charging channel of a charging circuit to prevent the excessive charging current in the charging channel.
In the multichannel fuse trimming circuit, an absorption capacitor for absorbing peak voltage is arranged in a discharge channel of a discharge circuit, so that the problem that the peak voltage is increased due to parasitic inductance and parasitic capacitance existing in an instantaneous discharge channel of a fuse is solved.
The utility model also provides a multichannel fuse trimming system which comprises the multichannel fuse trimming circuit.
The foregoing descriptions of specific exemplary embodiments of the present utility model are presented for purposes of illustration and description. It is not intended to limit the utility model to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the utility model and its practical application to thereby enable one skilled in the art to make and utilize the utility model in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. The scope of the utility model is defined by the claims and the equivalents thereof.
Claims (10)
1. A multichannel fuse trimming circuit with trimming capacitor array is characterized by comprising a power supply circuit, a charging circuit and a discharging circuit which are sequentially connected in series,
wherein,
the power supply circuit comprises an adjustable direct current stabilized power supply;
the charging circuit is provided with a plurality of charging channels;
the discharge circuit is provided with a plurality of discharge channels;
each charging channel comprises a charging isolating switch and a trimming capacitor which are connected in series, wherein a first end of the charging isolating switch is connected to the adjustable direct-current stabilized power supply, a second end of the charging isolating switch is connected to a first end of the trimming capacitor, a third end of the charging isolating switch is connected to a control interface of an external tester, a second end of the trimming capacitor is grounded, and trimming capacitors in the charging channels jointly form a trimming capacitor array;
each discharging channel comprises a discharging isolating switch and a fuse which are connected in series, wherein the first end of the discharging isolating switch is connected to the first end of the trimming capacitor, the second end of the discharging isolating switch is connected to the first end of the fuse, the third end of the discharging isolating switch is connected to a control interface of the external testing machine, and the second end of the fuse is connected to the second end of the trimming capacitor and grounded.
2. The multi-channel fuse trimming circuit with trimming capacitor array of claim 1, wherein the adjustable dc voltage regulator is two-way and connected in parallel.
3. The multi-channel fuse trimming circuit with trimming capacitor array of claim 2, wherein the charge blocking switch and the discharge blocking switch are a charge blocking relay and a discharge blocking relay, respectively.
4. The multi-channel fuse trimming circuit with trimming capacitor array of claim 2, wherein the charge blocking switch and the discharge blocking switch are respectively a charge blocking mosfet and a discharge blocking mosfet.
5. The multi-channel fuse trimming circuit with trimming capacitor array according to claim 3 or 4, wherein a diode is arranged in each charging channel, the second end of the charging cut-off switch is connected in series to the anode of the diode, and the cathode of the diode is connected in series to the first end of the trimming capacitor.
6. The multi-channel fuse trimming circuit with trimming capacitor array according to claim 3 or 4, wherein a power limiting resistor is arranged in each charging channel, the second end of the charging cut-off switch is connected in series to the first end of the power limiting resistor, and the second end of the power limiting resistor is connected in series to the first end of the trimming capacitor.
7. The multi-channel fuse trimming circuit with trimming capacitor array according to claim 3 or 4, wherein a diode and a power limiting resistor are connected in series in each charging channel, the second end of the charging cut-off switch is connected to the positive pole of the diode in series, the negative pole of the diode is connected to the first end of the power limiting resistor in series, and the second end of the power limiting resistor is connected to the first end of the trimming capacitor in series.
8. The multi-channel fuse trimming circuit with trimming capacitor array according to claim 3 or 4, wherein a power limiting resistor and a diode are arranged in each charging channel and are connected in series, the second end of the charging cut-off switch is connected to the first end of the power limiting resistor in series, the second end of the power limiting resistor is connected to the positive electrode of the diode in series, and the negative electrode of the diode is connected to the first end of the trimming capacitor in series.
9. The multi-channel fuse trimming circuit with trimming capacitor array according to claim 3 or 4, wherein each discharging channel is provided with a absorption capacitor for absorbing spike voltage, and the absorption capacitors are connected in parallel at two ends of the fuse.
10. A multichannel fuse trimming system with a trimming capacitor array is characterized in that: a multichannel fuse trimming circuit comprising the array of trimming capacitors of any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320432704.0U CN220154580U (en) | 2023-03-09 | 2023-03-09 | Multichannel fuse trimming circuit and system with trimming capacitor array |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320432704.0U CN220154580U (en) | 2023-03-09 | 2023-03-09 | Multichannel fuse trimming circuit and system with trimming capacitor array |
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| CN220154580U true CN220154580U (en) | 2023-12-08 |
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