Patent ID: 6958840

Claim:
A driving circuit for an optical modulator, comprising: a first transistor coupled to a first input terminal and a current source; a second transistor coupled to the first transistor, the current source, and a second input terminal, wherein the current source is coupled to a connection point of the first transistor and the second transistor; a third transistor coupled to the first transistor in serial and coupled to a first current source, wherein the first current source is coupled to a connection point of the first transistor and the third transistor; a fourth transistor coupled to the second transistor in serial and coupled to a second current source, wherein the second current source is coupled to a connection point of the second transistor and the fourth transistor; a first feedback circuit coupled to the third transistor, wherein the first feedback circuit comprises a first low frequency feedback circuit and a first high frequency feedback circuit coupled to the first low frequency feedback circuit; and a second feedback circuit coupled to the fourth transistor, wherein the second feedback circuit comprises a second low frequency feedback circuit and a second high frequency feedback circuit coupled to the second low frequency feedback circuit.