Circuit and method for reducing output noise of regulator
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United States of America Patent
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Nov 16, 2010
Grant Date -
May 14, 2009
app pub date -
Nov 9, 2007
filing date -
Nov 9, 2007
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Abstract
A circuit and a method for reducing output noise when a pulse width modulation mode is started. A pulse width modulation circuit generates a first pulse signal having a duty cycle that is in accordance with an output voltage of a regulator circuit. A drive circuit generates the output voltage from an input voltage in response to the first pulse signal provided from the pulse width modulation circuit. A feed forward circuit controls the pulse width modulation circuit in a manner to generate the first pulse signal having a duty cycle that maintains the output voltage at a desired level before the pulse width modulation circuit provides the first pulse signal to the drive circuit.
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