Differential ring oscillator
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United States of America Patent
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Dec 15, 2009
Grant Date -
Mar 13, 2008
app pub date -
Aug 23, 2007
filing date -
Aug 25, 2006
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Abstract
A differential amplifier circuit includes: a differential transistor pair composed of first and second transistors; a first resistance connected to a junction point of the first and second transistors at one terminal and to a first voltage node at the other terminal; second and third resistances provided between the first and second transistors, respectively, and a second voltage node; and first and second passive circuits respectively connected to the second and third resistances, the load characteristics of the passive circuits changing according to a control signal supplied. A ring oscillator is composed of a plurality of such differential amplifier circuits connected in a loop.
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