Method and apparatus for fast power-on of the band-gap reference

A fast power-on band-gap reference circuit, comprising:

• a band-gap logic;
• a band-gap dummy logic, wherein during power-on, both the band-gap logic and the band-gap dummy logic are activated, the band-gap dummy logic is coupled to a band-gap line, and charges a capacitance of the band-gap line, wherein when an output of the band-gap logic reaches a predetermined value, the band-gap dummy logic is deactivated;
• a buffer coupled to the band-gap line, wherein when the output of the band-gap logic reaches the predetermined value, the buffer is activated and the output of the band-gap logic is coupled to the buffer, wherein after waiting for a predetermined period of time, the buffer is deactivated and the output of the band-gap logic is directly coupled to the band-gap line;
• and
• a detector and control logic for activating and deactivating the band-gap logic, the band-gap dummy logic, and the buffer.

A method for fast power-on of a band-gap reference circuit, comprising:

• charging a capacitance of a band-gap line of the circuit by a band-gap logic and a band-gap dummy logic;
• determining if an output of the band-gap logic has reached a predetermined value;
• and
• deactivating the band-gap dummy logic, if the output of the band-gap logic has reached the predetermined value.

A method for fast power-on of a band-gap reference circuit, comprising:

• charging a capacitance of a band-gap line of the circuit by a band-gap logic and a band-gap dummy logic;
• determining if an output of the band-gap logic has reached a predetermined value;
• deactivating the band-gap dummy logic and activating a buffer, if the output of the band-gap logic has reached the predetermined value;
• coupling the output of the band-gap logic to the buffer;
• and
• after a predetermined period of time, deactiving the buffer and coupling the output of the band-gap logic directly to the band-gap line.