A differential signal generation circuit, comprising:
- a first current source receiving a first operation voltage to generate a first current;
- a current modulator circuit adjusting a current of a first output terminal and a current of a second output terminal;
- a PMOS transistor pair coupled between the first current source and the current modulator circuit to provide the first current to the current modulator circuit and receiving a first input signal and a second input signal;
- a first current control circuit coupled to the PMOS transistor pair in parallel, wherein in response to the PMOS transistor pair being turned off, the first current control circuit transmits the first current to the current modulator circuit;
- a second current source receiving a second operation voltage to generate a second current;
- an NMOS transistor pair coupled between the current modulator circuit and the second current source to provide the second current to the current modulator circuit and receiving the first input signal and the second input signal;
- a second current control circuit coupled to the NMOS transistor pair in parallel, wherein in response to the NMOS transistor pair being turned off, the second current control circuit transmits the second current to the current modulator circuit;
- a third current source receiving the first operation voltage and coupled to the first output terminal;
- a fourth current source coupled to the first output terminal and receiving the second operation voltage;
- a fifth current source receiving the first operation voltage and coupled to the second output terminal;
- a sixth current source coupled to the second output terminal and receiving the second operation voltage;
- and
- a common-mode feedback (CMFB) circuit adjusting the third current source or the fourth current source based on a voltage of the first output terminal and a common-mode voltage and adjusting the fifth current source or the sixth current source based on a voltage of the second output terminal and the common-mode voltage, and
- wherein:
- in response to the first current control circuit being in operation, the current modulator circuit provides a first sub-current to the first output terminal and provides a second sub-current to the second output terminal,
- in response to the second current control circuit being in operation, the current modulator circuit provides a third sub-current to the first output terminal and provides a fourth sub-current to the second output terminal, and
- a first sum of the first sub-current and the second sub-current is equal to the first current, and a second sum of the third sub-current and the fourth sub-current is equal to the second current.