Method and apparatus for low voltage CMOS start circuit

摘要

A method and apparatus for low voltage start circuit is provided. The start circuit (140) includes a first voltage converter (203) having a first booster circuit (210) and a first voltage multiplier (220) for converting a DC battery voltage to a converted DC voltage. The converted DC voltage is connected to an input of a second booster circuit (230) of a second voltage converter (205). The second voltage converter (205) includes the second booster circuit (230) and a second voltage multiplier (240). An output of the second voltage multiplier (240) is fed back to the input of the second booster circuit (230) for boosting the converted DC voltage to a predetermined threshold value. A voltage detector (136) compares the converted DC voltage to the predetermined threshold value. A controller (141) disables the start circuit (140) and enables a main DC-DC conversion circuit of the pager (100) when the converted DC voltage reaches the predetermined threshold value.