STARTUP CIRCUIT OF BANDGAP REFERENCE VOLTAGE GENERATION CIRCUIT

摘要

PURPOSE: A startup circuit of a bandgap reference voltage generation circuit is provided to perform easily control operations according to signal modes and reduce the power consumption by simplifying a total structure of the startup circuit. CONSTITUTION: A P-type MOSFET(101) includes a source connected with a supply voltage terminal(VDD) and a gate connected with an earth portion. One end of a switch(110) is connected with a drain of the P-type MOSFET(101). The other end of the switch(110) is connected with a drain and a gate of the first N-type MOSFET(102). The switch(110) is turned on or off according to an external enable signal(EN). A current mirror(MR1) is formed with the first N-type MOSFET(102) and the second N-type MOSFET(103). The third N-type MOSFET(104) has a gate and a drain connected with a source of the first N-type MOSFET(102). An output terminal is formed at a drain of the second N-type MOSFET(103).