Relaxation oscillator
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United States of America Patent
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Aug 25, 2015
Grant Date -
Apr 23, 2015
app pub date -
Oct 17, 2013
filing date -
Oct 17, 2013
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Abstract
A relaxation oscillator includes a first amplifier having a first input terminal receiving an output voltage signal, a second input terminal receiving a reference voltage signal, and an output terminal comparing the output voltage signal and the reference voltage signal and in response thereto outputting a control signal; a second amplifier having a first input terminal receiving the output voltage signal, a second input terminal connected to the output terminal of the first amplifier for receiving the control signal, and an output terminal connected to the first input terminal of the first amplifier and the first input terminal of the second amplifier for comparing the control signal and the output voltage signal and in response thereto outputting the output voltage signal; and a sensing capacitor for generating the output voltage signal by charging/discharging operations by the output terminal of the second amplifier.
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