Patent ID: 7777530

Claim:
A comparator module, having an output terminal, a first input terminal coupled to a first voltage source, and a second input terminal coupled to a second voltage source, the comparator module comprising: a current source module, coupled to a third voltage source, for generating a bias current; a first voltage level adjusting circuit module, coupled between the current source module and the first voltage source, for receiving the bias current and detecting a first input signal of the first voltage source to generate a third input signal; a second voltage level adjusting circuit module, coupled between the current source module and the second voltage source, for receiving the bias current and detecting a second input signal of the second voltage source to generate a fourth input signal; and a comparing circuit module, coupled between the first voltage level adjusting circuit module, the second voltage level adjusting circuit module, the first voltage source, the second voltage source, and the third voltage source, for receiving the third input signal and the fourth input signal to generate an output signal, the comparing circuit module comprising: a first switch module, for coupling the third voltage source to a first node or a second node, wherein the first node is coupled to the output terminal; and a second switch module, coupled between the first node, the second node, the first voltage level adjusting circuit module, the second voltage level adjusting circuit module, the first voltage source, and the second voltage source, the second switch module comprising: a first switch element, having a control terminal coupled to the first voltage level adjusting circuit module, a first terminal coupled to the second voltage source, and a second terminal coupled to the first node, the first switch element being utilized for receiving the third input signal; and a second switch element, having a control terminal coupled to the second voltage level adjusting circuit module, a first terminal coupled to the first voltage source, and a second terminal coupled to the second node, the second switch element being utilized for receiving the fourth input signal.