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Hot switchable voltage bus for IDDQ current measurements

A voltage bus, current measurement technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as the inability to effectively use the test time and the inability to maintain the state of the voltage island

Inactive Publication Date: 2006-11-08
INT BUSINESS MASCH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, each time a different set of voltage islands V1, V2, ..., Vn is tested, the tester must repeatedly apply the same test pattern, which is not an efficient use of test time
This happens because the voltage island does not maintain state when disconnected (i.e. not powered)

Method used

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  • Hot switchable voltage bus for IDDQ current measurements
  • Hot switchable voltage bus for IDDQ current measurements
  • Hot switchable voltage bus for IDDQ current measurements

Examples

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Embodiment Construction

[0022] The present invention solves the above problems and others by providing a voltage island system including a hot-switchable voltage bus for IDDQ current measurement.

[0023] now refer to figure 2 , which shows a voltage island system 100 according to the invention. As shown in the figure, the voltage island system 100 includes multiple voltage islands V1 , V2 , . . . , Vn, a global power system 102 and a static power system 104 . The global power supply system 102 includes a plurality of on-chip head devices H1, H2, ..., Hn, which are used to selectively power the group of voltage islands in response to the first head control signals x1, x2, ..., xn, respectively. V1, V2, . . . , Vn provide a voltage VDDg. A global VDDg supply 106 powers the head devices H1 , H2 , . . . , Hn through the VDDg power distribution grid / bus 108 . The static power supply system 104 includes a second set of on-chip head devices H1q, H2q, ..., Hnq, which are used to selectively power the se...

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Abstract

A voltage island system includes a hot-switchable voltage bus for IDDQ current measurements. The voltage island system includes a plurality of voltage islands, a global power system, and a quiescent power system. The global power system includes a plurality of on-chip global header devices for selectively providing a voltage VDDg to the plurality of voltage islands in response to global header control signals, respectively. A global VDDg power supply provides power to the global header devices via a VDDg power distribution grid / bus. The quiescent power system includes a plurality of on-chip quiescent header devices for selectively providing a quiescent voltage VDDq to the plurality of voltage islands in response to quiescent header control signals, respectively. A quiescent VDDq power supply provides power to the quiescent header devices via a VDDq power distribution grid / bus.

Description

technical field [0001] The present invention relates generally to integrated circuits. More particularly, the present invention is directed to a voltage island system including a hotswitchable voltage bus for IDDQ (quiescent current test) current measurement. Background technique [0002] The voltage islands are usually designed into and implemented on the integrated circuit chip so that the active supply power and the standby supply power can be reduced by changing the supply voltage of each voltage island. Voltage islands have also been implemented to reduce noise through power isolation. The principle of voltage islands can greatly reduce power consumption by enabling designers to construct, for example, processors with different voltages on a chip. For example, a single system-on-a-chip processor can be configured to operate at one voltage in one or more areas of the chip (such as the processor core) and at a voltage in other areas of the chip. Different voltages work...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/26G01R31/30
CPCG01R31/3008
Inventor 利厄·M·P·帕斯特尔
Owner INT BUSINESS MASCH CORP