CN110907809A - Board mode program control voltage bias test circuit of large-scale digital integrated circuit - Google Patents

Board mode program control voltage bias test circuit of large-scale digital integrated circuit Download PDF

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CN110907809A
CN110907809A CN201911055465.6A CN201911055465A CN110907809A CN 110907809 A CN110907809 A CN 110907809A CN 201911055465 A CN201911055465 A CN 201911055465A CN 110907809 A CN110907809 A CN 110907809A
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relay
control
resistor
potentiometer
output
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王贺
张大宇
汪悦
张红旗
张松
李剑焘
崔华楠
杨彦朝
庄仲
吉美宁
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China Academy of Space Technology CAST
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/28—Testing of electronic circuits, e.g. by signal tracer
    • G01R31/317—Testing of digital circuits
    • 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
    • G01R31/30—Marginal testing, e.g. by varying supply voltage
    • G01R31/3004—Current or voltage test
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/28—Testing of electronic circuits, e.g. by signal tracer
    • G01R31/317—Testing of digital circuits
    • G01R31/3173—Marginal testing

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  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Semiconductor Integrated Circuits (AREA)

Abstract

The invention relates to a large-scale digital integrated circuit board mode program control voltage bias test circuit which comprises a power module, a first numerical control potentiometer, a second numerical control potentiometer, a first relay, a second relay, a third relay, a first resistor, a second resistor, a third resistor and an instruction control module. According to the invention, through the cooperation of the power supply module, the numerical control potentiometer, the relay, the resistor and the instruction control module, the automatic control of the bias voltage in the large-scale digital circuit board mode bias test is realized, and a special instrument with large volume is not required to be carried, so that the portability is better.

Description

Board mode program control voltage bias test circuit of large-scale digital integrated circuit
Technical Field
The invention relates to a board mode program control voltage bias test circuit of a large-scale digital integrated circuit, belonging to the field of integrated circuit tests.
Background
When a large-scale digital integrated circuit is subjected to reliability tests such as board-level electrical performance test, verification, aging and the like, voltage bias tests are often required to be performed on cores, IO (input/output), PLL (phase locked loop) and other special power supply ports of the circuit, and the bias voltage is generally about +/-10% of a rated value in a manual. In practical tests, the circuit is powered mainly by 3 ways: (1) through a special program control power supply instrument; (2) power modules outputting via a fixed voltage, such as DC/DC, LDO, etc.; (3) and the power supply module outputs through variable voltage. The above methods have the following problems in practical use, respectively:
(1) the main problem of supplying power through a special program-controlled power supply instrument is that the instrument is generally large in size and weight and not easy to carry during testing, and especially when the working voltage of an integrated circuit is more than 4 paths (such as Xilinx 7 series FPGA, needs VCCINT, VCCAUX _ IO, VCCO, VCCBRAM, VREF, MGTAVCC, MGTAVTT, MGTVCCAUX, VCCADC and other auxiliary circuits on a board for power supply, etc.), a plurality of program-controlled power supply instruments are needed and are more difficult to carry.
(2) The main problem of power supply through the power module with fixed voltage output is that the bias voltage of the integrated circuit is usually about ± 10% of the standard value, for example, 3.3V is 3.0V and 3.6V after bias, and 0.9V and 1.1V after bias of 1.0V, while the power module with fixed voltage output can only provide standard voltage output such as 1.0V, 1.8V, 2.5V, 3.3V, and therefore, it cannot be used in bias test.
(3) The power module with variable voltage output also belongs to a power management chip product, and is characterized in that the voltage output value of the power module can be adjusted by externally connecting resistors with different resistance values on a control port of the power module. Such as the power module LMZ31710 of the company TI, by changing the R connected to the first control port and the second control portSETAnd RRTThe two resistance values are used for realizing 0.6V-5.5V range and 0.1V step voltage output, as shown in figures 1 and 2. Because the working voltage of a common digital integrated circuit is below 5V (except for a 4000 series high-voltage digital circuit), the output range of the power supply module can cover the bias test voltage range of most digital circuits.
The combination of the power supply module LMZ31710 with variable voltage output and a specific resistor can achieve the voltage output required by the pull-bias test, but it is difficult to change the value of the pull-bias voltage during the test. For example, the IO of the FPGA is programmable IO, the IO voltage is generally from 1.2V to 3.3V, the pull-bias voltages corresponding to the pull-bias tests with different output voltages are different, and at this time, R needs to be changedSETAnd RRTThe resistance value of (2). Whether the resistor with a new resistance value is electrically mounted again or the adjustable potentiometer is adopted, manual operation cannot be avoided, and automatic tests cannot be realized.
Disclosure of Invention
The technical problem solved by the invention is as follows: in order to overcome the defects of the prior art, a board mode program control voltage bias test circuit of a large-scale digital integrated circuit is provided, and the automation of the bias voltage in the large-scale digital circuit board mode bias test is realized.
The technical scheme of the invention is as follows:
a large-scale digital integrated circuit board-mode program control voltage bias test circuit comprises a power module, a first numerical control potentiometer, a second numerical control potentiometer, a first relay, a second relay, a third relay, a first resistor, a second resistor, a third resistor and an instruction control module,
the first control end of the power supply module is connected with the adjustable resistance end of the first numerical control potentiometer, the second control end of the power supply module is connected with the output end of the first relay, the first input end of the first relay is connected with the adjustable resistance end of the second numerical control potentiometer, the first input end of the first relay is connected with the output end of the second relay, the first input end of the second relay is connected with one end of the first resistor, and the other end of the first resistor is grounded; the second input end of the second relay is connected with the output end of the third relay, the first input end of the third relay is connected with one end of the second resistor, and the other end of the second resistor is grounded; a second input end of the third relay is connected with one end of a third resistor, and the other end of the third resistor is grounded;
a first control bus of the instruction control module is connected with a control port of the first numerical control potentiometer, and a second control bus of the instruction control module is connected with a control port of the second numerical control potentiometer; the control signal of the instruction controller is connected with the control ends of the first relay, the second relay and the third relay;
the command control module sends a configuration command of the corresponding numerical control potentiometer and a control command of the relay to the corresponding numerical control potentiometer and the corresponding relay according to the voltage value required to be output by the power supply module; the numerical control potentiometer changes the resistance value of the adjustable resistance end of the numerical control potentiometer according to the received configuration instruction; the relay changes the switch state according to the received control instruction.
Furthermore, the resistance value adjusting range of the first numerical control potentiometer is 0.1K omega-20K omega.
Furthermore, the resistance value adjusting range of the second digital potentiometer is 1K omega-200K omega.
Further, the output voltage of the power supply module is controlled by the resistance of a numerical control potentiometer or a resistor connected with the first control end of the power supply module and the second control end of the power supply module.
Furthermore, when the second control end of the power module needs to be connected with the first resistor, the instruction control module controls the second input end of the first relay to be connected with the output end, and the first input end of the second relay is connected with the output end.
Furthermore, when the second control end of the power module needs to be connected with the second resistor, the instruction control module controls the second input end of the first relay to be connected with the output end, the second input end of the second relay is connected with the output end, and the first input end of the third relay is connected with the output end.
Furthermore, when the second control end of the power module needs to be connected with the second resistor, the instruction control module controls the second input end of the first relay to be connected with the output end, the second input end of the second relay is connected with the output end, and the second input end of the third relay is connected with the output end.
Furthermore, when the second control end of the power module needs to be connected with the second numerical control potentiometer, the instruction control module controls the first input end of the first relay to be connected with the output end.
Further, the output voltage of the power module should be generated after the resistance value of the connection of the first control terminal and the second control terminal is determined.
Further, the power module controls the output of the voltage through the power input port or the output enable port.
Compared with the prior art, the invention has the beneficial effects that:
(1) compared with a method for supplying power for a pull-bias test by adopting a special program-controlled power supply instrument, the invention realizes the automatic control of the pull-bias voltage in the pull-bias test in a large-scale digital circuit board mode by matching the power supply module, the numerical control potentiometer, the relay, the resistor and the instruction control module, and does not need to carry a special instrument with large volume, so the portability is better;
(2) compared with the traditional board mode detection test, the invention can automatically control the change of the bias voltage through the instruction control module without manually changing and adjusting the resistance value of the power module, and can realize the fully-automatic integrated circuit automatic bias test.
Drawings
FIG. 1 is a schematic diagram of a prior art power module LMZ31710 method of use;
FIG. 2 is a prior art power module LMZ31710 output voltage versus resistance;
fig. 3 is a circuit schematic of the present invention.
Detailed Description
The invention is further illustrated by the following examples.
A large-scale digital integrated circuit board-mode program control voltage bias test circuit is based on a power supply module with variable voltage output, a numerical control potentiometer, a relay, a resistor and an instruction control module, wherein the instruction control module sends a configuration instruction of the corresponding numerical control potentiometer and a switch instruction of the relay to the corresponding numerical control potentiometer and the relay according to a voltage value required to be output by the power supply module; the numerical control potentiometer changes the resistance value of the adjustable resistance end of the numerical control potentiometer according to the received configuration instruction; the relay changes the switching state according to the received switching instruction, further changes the output voltage of the power supply module, realizes the automatic control of the bias voltage in the large-scale digital circuit board mode bias test, and can effectively solve the problems in the prior art.
The specific circuit is shown in fig. 3, and comprises a power supply module, a first numerical control potentiometer, a second numerical control potentiometer, a first relay, a second relay, a third relay, a first resistor, a second resistor, a third resistor and an instruction control module,
the first control end of the power supply module is connected with the adjustable resistance end of the first numerical control potentiometer, the second control end of the power supply module is connected with the output end of the first relay, the first input end of the first relay is connected with the adjustable resistance end of the second numerical control potentiometer, the first input end of the first relay is connected with the output end of the second relay, the first input end of the second relay is connected with one end of the first resistor, and the other end of the first resistor is grounded; the second input end of the second relay is connected with the output end of the third relay, the first input end of the third relay is connected with one end of the second resistor, and the other end of the second resistor is grounded; a second input end of the third relay is connected with one end of a third resistor, and the other end of the third resistor is grounded;
a first control bus of the instruction control module is connected with a control port of the first numerical control potentiometer, and a second control bus of the instruction control module is connected with a control port of the second numerical control potentiometer; the control signal of the instruction controller is connected with the control ends of the first relay, the second relay and the third relay;
the command control module sends a configuration command of the corresponding numerical control potentiometer and a control command of the relay to the corresponding numerical control potentiometer and the corresponding relay according to the voltage value required to be output by the power supply module; the numerical control potentiometer changes the resistance value of the adjustable resistance end of the numerical control potentiometer according to the received configuration instruction; the relay changes the switch state according to the received control instruction.
The resistance value adjusting range of the first numerical control potentiometer is 0.1K omega-20K omega, the resistance value adjusting range of the second numerical control potentiometer is 1K omega-200K omega, and the output voltage of the power supply module is controlled by the resistance values of the numerical control potentiometers or the resistors connected with the first control end of the power supply module and the second control end of the power supply module.
When the second control end of the power supply module needs to be connected with the first resistor, the instruction control module controls the second input end of the first relay to be connected with the output end, and the first input end of the second relay is connected with the output end.
When the second control end of the power module needs to be connected with the second resistor, the instruction control module controls the second input end of the first relay to be connected with the output end, the second input end of the second relay is connected with the output end, and the first input end of the third relay is connected with the output end.
When the second control end of the power module needs to be connected with the second resistor, the instruction control module controls the second input end of the first relay to be connected with the output end, the second input end of the second relay is connected with the output end, and the second input end of the third relay is connected with the output end.
When the second control end of the power supply module needs to be connected with the second numerical control potentiometer, the instruction control module controls the first input end of the first relay to be connected with the output end.
The output voltage of the power supply module is generated after the resistance value of the connection of the first control end and the second control end is determined, and the power supply module controls the output of the voltage through the power supply input port or the output enabling port.
Examples
The embodiment is realized based on the power module LMZ31710, the first digital potentiometer AD5292-20(1024 resolution/20K resistor) and the second digital potentiometer AD5292-200(1024 resolution/200K resistor), and similar products of other models can also be selected.
Since the power supply standard voltage of the digital integrated circuit is generally 1.0V, 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5.0V, etc., the output voltage range of the power supply module of this embodiment mainly covers the ± 10% bias range of the above voltages, and the voltage values not listed can be designed according to the same method.
Table 1 details the voltage bias, R, of the main coverage of this exampleSETAnd RRTThe resistance value is required to be connected between the first control end and the second control end of the power module; R1/R2/R3 are the on/off states of the first/second/third relays, respectively, on indicating that the first input terminal is connected to the output terminal and off indicating that the second input terminal is connected to the output terminal; the control parameter is a control instruction required by the numerical control potentiometer AD5292 to change the output resistance.
TABLE 1 lookup table for output voltage of power module, control parameter of numerical control potentiometer and on-off state of relay
Figure BDA0002256435780000061
The following description is made by taking 1.1V voltage bias as an example:
(1) the command control module sends commands to the first digitally controlled potentiometer AD5292-20 via the first control bus, with the control parameters according to table 1 being 10'd 89. Resistor R between W port and B port of first numerical control potentiometer AD5292-20WB(D) The calculation formula of (2) is as follows:
Figure BDA0002256435780000071
wherein R isABIs a resistance across AB, R AB20K Ω, control ginsengThe number D is 89, at which time R can be calculatedWB1.738K Ω, i.e. when the first control port of the power supply module LMZ31710 passes through RWB1.738K Ω resistance is connected to ground and to a standard value RSETThe error is only 0.1% for 1.74K Ω.
(2) The command control module sends a control command to the relays to control the first relay (namely R1 in the table 1) to be closed and the second relay (namely R2 in the table 1) to be opened. At this time, the second control terminal of the power module LMZ31710 is connected to the ground through the first resistor with the value of 1000K omega, and is connected to the standard value RRT1000K Ω.
(3) The power supply module LMZ31710 is normally powered up through the power supply input port, and the output voltage value of the voltage output port is 1.1V bias voltage.
In addition, as can be seen from Table 1, when the required bias voltage is greater than or equal to 2.5V, in addition to operating the three relays, R of the second digital control potentiometer AD5292-200 is requiredWBThe control is carried out in a manner similar to the operation of the first numerical control potentiometer AD5292-20, and the detailed description is omitted.
The above description is only for the best mode of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.

Claims (10)

1. A large-scale digital integrated circuit board-mode program control voltage bias test circuit is characterized by comprising a power module, a first numerical control potentiometer, a second numerical control potentiometer, a first relay, a second relay, a third relay, a first resistor, a second resistor, a third resistor and an instruction control module,
the first control end of the power supply module is connected with the adjustable resistance end of the first numerical control potentiometer, the second control end of the power supply module is connected with the output end of the first relay, the first input end of the first relay is connected with the adjustable resistance end of the second numerical control potentiometer, the first input end of the first relay is connected with the output end of the second relay, the first input end of the second relay is connected with one end of the first resistor, and the other end of the first resistor is grounded; the second input end of the second relay is connected with the output end of the third relay, the first input end of the third relay is connected with one end of the second resistor, and the other end of the second resistor is grounded; a second input end of the third relay is connected with one end of a third resistor, and the other end of the third resistor is grounded;
a first control bus of the instruction control module is connected with a control port of the first numerical control potentiometer, and a second control bus of the instruction control module is connected with a control port of the second numerical control potentiometer; the control signal of the instruction controller is connected with the control ends of the first relay, the second relay and the third relay;
the command control module sends a configuration command of the corresponding numerical control potentiometer and a control command of the relay to the corresponding numerical control potentiometer and the corresponding relay according to the voltage value required to be output by the power supply module; the numerical control potentiometer changes the resistance value of the adjustable resistance end of the numerical control potentiometer according to the received configuration instruction; the relay changes the switch state according to the received control instruction.
2. The board-mode programmable voltage bias test circuit of claim 1, wherein the first digitally controlled potentiometer has a resistance value adjustable in a range of 0.1K Ω -20K Ω.
3. The board-mode programmable voltage bias test circuit of claim 1, wherein the resistance of the second digitally controlled potentiometer is adjusted to a value in the range of 1K Ω -200K Ω.
4. The board-mode programmable voltage bias test circuit of claim 1, wherein the output voltage of the power module is controlled by the resistance of a digital control potentiometer or a resistor connected between the first control terminal of the power module and the second control terminal of the power module.
5. The large-scale digital integrated circuit board-mode program-controlled voltage bias test circuit as claimed in claim 1, wherein when the second control terminal of the power module needs to be connected to the first resistor, the command control module controls the second input terminal of the first relay to be connected to the output terminal, and the first input terminal of the second relay is connected to the output terminal.
6. The large-scale digital integrated circuit board-mode program-controlled voltage bias test circuit as claimed in claim 1, wherein when the second control terminal of the power module needs to be connected to the second resistor, the command control module controls the second input terminal of the first relay to be connected to the output terminal, the second input terminal of the second relay to be connected to the output terminal, and the first input terminal of the third relay to be connected to the output terminal.
7. The large-scale digital integrated circuit board-mode program-controlled voltage bias test circuit as claimed in claim 1, wherein when the second control terminal of the power module needs to be connected to the second resistor, the command control module controls the second input terminal of the first relay to be connected to the output terminal, the second input terminal of the second relay to be connected to the output terminal, and the second input terminal of the third relay to be connected to the output terminal.
8. The board-mode programmable voltage bias test circuit of large-scale digital integrated circuit according to claim 1, wherein the command control module controls the first input terminal of the first relay to be connected to the output terminal when the second control terminal of the power module needs to be connected to the second digitally controlled potentiometer.
9. The on-board programmable voltage bias test circuit of claim 1, wherein the output voltage of the power module is determined after the resistance value of the first control terminal and the second control terminal is determined.
10. The board-wise programmable voltage bias test circuit of claim 9, wherein the power module controls the output of the voltage through the power input port or the output enable port.
CN201911055465.6A 2019-10-31 2019-10-31 Board mode program control voltage bias test circuit of large-scale digital integrated circuit Pending CN110907809A (en)

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