Patent ID: 6987416

Claim:
A bandgap reference circuit comprising: a first bandgap reference unit having an output connected to a first node (n 1 ); a second bandgap reference unit having an output connected to a second node (n 2 ); and a subtractor comprising: a first transistor (M 4 ) having a source connected to a first voltage, and a drain and a gate both connected to the second node (n 2 ); a second transistor (M 5 ) having a source connected to the first voltage, a drain connected to a third node (n 3 ), and a gate connected to the gate of the first transistor (M 4 ); a third transistor (M 6 ) having a source connected to a second voltage, and a drain and a gate both connected to the first node (n 1 ); a fourth transistor (M 7 ) having a source connected to the second voltage, a drain connected to the third node (n 3 ), and a gate connected to the gate of the third transistor (M 6 ); and an output resistor (RREF) connected between the third node (n 3 ) and the second voltage.