Enchanced stability voltage controlled RC oscillator
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United States of America Patent
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Jul 1, 1997
Grant Date -
N/A
app pub date -
Mar 15, 1996
filing date -
Mar 15, 1996
priority date (Note) -
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Abstract
A voltage controlled oscillator having substantial frequency dependence on a parallel RC timing element including a voltage-variable resistance element, such as a MOSFET biased in the triode region. One terminal of the timing element can be connected to ground. The voltage used to tune the timing element, to lock the voltage controlled oscillator to a reference frequency can be used to control similar timing elements integrated upon the same circuit, for example a continuous-time filter in an ethernet transceiver. The oscillator frequency is substantially independent of variations in supply voltage.
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