Bias supply selection circuit, method of operation thereof and power supply employing the same
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United States of America Patent
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Feb 17, 2004
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app pub date -
Aug 12, 2002
filing date -
Aug 12, 2002
priority date (Note) -
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Abstract
The present invention provides a bias supply selection circuit employable with a linear regulating device configured to provide a first bias supply voltage and a main bias supply stage configured to provide a second bias supply voltage. In one embodiment, the bias supply selection circuit includes a voltage monitoring circuit configured to monitor a level of the second bias supply voltage and to provide a control voltage proportional to the level. Additionally, the bias supply selection circuit includes a controllable switching circuit, coupled to the voltage monitoring circuit, configured to select the second bias supply voltage by deactivating the linear regulating device when the control voltage reaches a predetermined value.
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