DC-DC converter switching transistor current measurement technique
First Claim
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1. An apparatus, comprising:
- a) a switching transistor;
b) a pair of transistors having their conductive channels coupled in series, a drain of one of said pair of transistors coupled to one end of said switching transistor'"'"'s conductive channel, a source of the other of said pair of transistors coupled to the other end of said switching transistor'"'"'s conductive channel; and
, c) a node between said pair of transistors coupled to an input of an amplifier.
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Abstract
A method is described comprising conducting a first current through a switching transistor. The method also comprises conducting a second current through a pair of transistors whose conductive channels are coupled in series with respect to each other and are together coupled in parallel across the switching transistor'"'"'s conductive channel. The second current is less than and proportional to the first current.
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Citations
25 Claims
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1. An apparatus, comprising:
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a) a switching transistor;
b) a pair of transistors having their conductive channels coupled in series, a drain of one of said pair of transistors coupled to one end of said switching transistor'"'"'s conductive channel, a source of the other of said pair of transistors coupled to the other end of said switching transistor'"'"'s conductive channel; and
,c) a node between said pair of transistors coupled to an input of an amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 19)
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14. A method, comprising:
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conducting a first current through a switching transistor; and
,conducting a second current through a pair of transistors whose conductive channels are coupled in series with respect to each other and are together coupled in parallel across said switching transistor'"'"'s conductive channel, said second current less than and proportional to said first current. - View Dependent Claims (15, 16, 17, 18)
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20. A computing system, comprising:
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a) one or more processors having an on-chip DC-DC converter, said on chip DC-DC converter comprising a switching transistor and a current measurement circuit, said current measurement circuit comprising a pair of transistors having their conductive channels coupled in series, a drain of one of said pair of transistors coupled to one end of said switching transistor'"'"'s conductive channel, a source of the other of said pair of transistors coupled to the other end of said switching transistor'"'"'s conductive channel;
a node between said pair of transistors coupled to a measurement leg of an amplifier;
b) a memory controller coupled to said one or more processors;
c) a graphics processor coupled to said memory controller; and
,d) an LCD display coupled to said graphics processor. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification