Multi-speed ring oscillator
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United States of America Patent
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May 4, 2010
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N/A
app pub date -
Apr 18, 2007
filing date -
Apr 18, 2007
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Abstract
A ring oscillator comprises a control circuit for receiving a frequency-selection signal operative to select from at least two ring oscillator frequencies, said control circuit using said control signal to generate a first control signal and a second control signal; a primary chain of an odd number of serially connected NOT gates, said primary chain including a primary switching NOT gate responsive to the first control signal and operative to perform a logical NOT or an IGNORE function on a first oscillating input signal to generate a first output signal; and a secondary chain of serially connected NOT gates, said secondary chain logically parallel to at least said primary switching NOT gate, said secondary chain including a secondary switching NOT gate responsive to the second control signal and operative to perform a logical NOT or an IGNORE function on a second oscillating input signal to generate a second output signal.
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