Patent ID: 11937005
Assignee: GUANGZHOU TYRAFOS SEMICONDUCTOR TECHNOLOGIES CO., LTD
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 9:
10. The output stage circuit according to claim 1, wherein the current source circuit comprises:
a twelfth transistor, wherein a first terminal of the twelfth transistor is coupled to the supply voltage, and a control terminal of the twelfth transistor is coupled to a second terminal of the twelfth transistor;
a thirteenth transistor, wherein a first terminal of the thirteenth transistor is coupled to the supply voltage, a control terminal of the thirteenth transistor is coupled to the control terminal of the twelfth transistor, and the second terminal of the thirteenth transistor is coupled to a reference resistor;
a fourth operational amplifier, wherein a first input terminal of the fourth operational amplifier is coupled to the second terminal of the thirteenth transistor, a second input terminal of the fourth operational amplifier is coupled to the second terminal of the fourth transistor, and an output terminal of the fourth operational amplifier is coupled to the control terminal of the fourth transistor;
a fourteenth transistor, wherein a first terminal of the fourteenth transistor is coupled to the second terminal of the twelfth transistor, and a second terminal of the fourteenth transistor is coupled to the ground terminal voltage; and
a fifteenth transistor, wherein a first terminal of the fifteenth transistor is coupled to a control terminal of the fourteenth transistor, a control terminal of the fifteenth transistor, and a current input terminal, and a second terminal of the fifteenth transistor is coupled to the ground terminal voltage.