Front-end receiving circuit and method for the same

A front-end receiving method for a front-end receiving circuit, adapted for transmitting a signal to a back-end circuit connected to the front-end receiving circuit, comprising:

• configuring a first input terminal to receive a first signal;
• configuring a second input terminal to receive a second signal;
• configuring a first comparator input and a second comparator input of a comparator to be respectively coupled to the first input terminal and the second input terminal;
• configuring a first sampling switch to be coupled between the first input terminal and the first comparator input terminal;
• configuring one end of a first capacitor of a first sampling shifting circuit to be coupled between the first sampling switch and the first comparator input terminal;
• configuring a first reference voltage source of the first sampling shifting circuit to be coupled to another end of the first capacitor through a second sampling switch;
• configuring a second reference voltage source of the first sampling shifting circuit to be coupled to the another end of the first capacitor through a first shifting switch;
• configuring a control circuit to be electrically coupled to the first sampling switch, the second sampling switch, and a control end of the first shifting switch, respectively,
• configuring the control circuit to enter a sampling mode to control the first sampling switch and the second sampling switch to be turned on, and control the first shifting switch to be turned off;
• and
• configuring the control circuit to enter a shifting mode to control the first sampling switch and the second sampling switch to be turned off, and control the first shifting switch to be turned on.