Supply independent bias source with start-up circuit

Abstract

Abstract A supply independent bias start-up circuit which is capable of preventing an additional current consumption which may occur therein after the start-up of a supply independent bias circuit thereof, stabilizing a bias voltage even if an input voltage from a power source is varied, and reducing a layout area thereof. The supply independent bias start-up circuit includes a supply independent bias circuit for inputting a voltage from a power source and generating a constant bias voltage, and a start-up circuit for inputting the source voltage, starting up the supply independent bias circuit at the beginning of apply of the source voltage thereto and blocking its own current loop after the source voltage enters a stabilized state. The start-up circuit is provided with a resistor having its one side connected to a power source terminal, for being applied with the source voltage, and a condenser having its one side connected to a bias voltage output node in the supply independent bias circuit, for supplying a start-up current to the supply independent bias circuit and buffering a variation of the source voltage and the bias output voltage from the supply independent bias circuit.

Inventors

• 👤 Woo H. Baik

Bibliographic Details