BANDGAP REFERENCE VOLTAGE GENERATOR

摘要

Disclosed is a bandgap reference voltage generator insensitive to changes of process, voltage, and temperature. A bandgap reference voltage generator may detect current having characteristic of CTAT and current having characteristic of PTAT which flow in a current compensation part included in an amplification part, and provide body voltage to one of two input transistors included in the amplification part in response to ratio of the two currents when the ratio is different from the preconfigured reference value. Thus, characteristics according to changes of parameters of elements and change of offset of the amplification part due to changes of PVT may be enhanced, and a characteristic of power supply rejection ratio (PSRR) may be enhanced.

主权项

1. A bandgap reference voltage generator comprising:
a current source part configured as current mirror to provide a first current, a second current, and a third current; a first current compensation part generating a first node voltage according to the first current and compensating a change of current due to changes of at least one of process, voltage, and temperature (PVT); a second current compensation part generating a second node voltage according to the second current and compensating a change of current due to changes of at least one of process, voltage, and temperature (PVT) by generating a fourth current and a fifth current which have change characteristics opposite to each other according to change of absolute temperature; an amplification part comprising a first input transistor which receives the first node voltage through its gate and a second input transistor which receives the second node voltage through its gate, and outputting a voltage to drive the current source part according the first node voltage and the second node voltage; a voltage providing part detecting amount of change in the fourth current and the fifth current, and providing body voltage to one of the first input transistor and the second input transistor according to the detected amount of change; and an output part outputting reference voltage according to the third current.