Nokia Mobile Phones Limited

Karri Ranta-aho

Jyri Kalervo Rauhala

Tommi Leino

The invention relates to a method for forming an operating voltage (V ) for an electronic device ( ) from a supply voltage (V ) by means ( ) for forming the operating voltage. In the method, a minimum value (V ) and a maximum value (V ) are defined for the operating voltage (V ). The means ( ) for forming the operating voltage are provided with at least a first operating voltage supply block ( ) and a second operating voltage supply block ( ). In the first operating voltage supply block ( ), the output voltage is limited smaller than said maximum value (V ) for the operating voltage. Furthermore, at least a first limit value (V ) is determined, and the supply voltage (V ) is compared with said first limit value (V ), wherein if the supply voltage (V ) is greater than said first limit value (V ), the first operating voltage supply block ( ) is activated to form the operating voltage (V ) from the supply voltage (V ). If the supply voltage (V ) is substantially smaller than said first limit value (V ), the second operating voltage supply block ( ) is activated to form the operating voltage (V ) from the supply voltage (V ).

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Tampere, Finland

Karri Ranta-aho