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Integrated Circuit Chip Power Switching Circuit

IP.com Disclosure Number: IPCOM000080306D
Original Publication Date: 1973-Nov-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Shen, MN: AUTHOR

Abstract

With a fixed power dissipation for an integrated circuit chip, more circuits can be designed into one chip if part of the circuits can be switched off when they are not used during part of the cycle time, or due to system requirements.

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Integrated Circuit Chip Power Switching Circuit

With a fixed power dissipation for an integrated circuit chip, more circuits can be designed into one chip if part of the circuits can be switched off when they are not used during part of the cycle time, or due to system requirements.

Shown in the figure is an integrated circuit chip power switching circuit 10 relating to a commonly used chip power supply scheme. Tx1 is a switching transistor which can be turned on or off by a latch 11, and Tx2 is a power transistor used as an emitter-follower to supply the voltage and current to a particular group of circuits. The power supply 10 can be switched on or off as required. D1, D4, D5 are silicon diodes and D2, D3 are Schottky diodes.

When Tx1 is turned on, the voltage at point B raises to VCE(SAT) above ground while the voltage at point A raises to VCE(SAT), plus two Schottky diode drops above ground. Inasmuch as Tx2 is turned off, Vo will then be only 0.4V due to the leakage current in Tx2, and the power supply to the particular group of circuits connected to the emitter of Tx2 will be switched off. When Tx1 is switched off, the power supply transistor Tx2 resumes normal operation.

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