Comparator module
AssigneeIli Technology Corp.
InventorsYen-Hui Wang, Ching-Rong Chang
Life of this patent
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Abstract
A comparator module applied to a voltage level clamping circuit which can be implemented in an integrated circuit (IC) is provided. The IC includes a parasitic diode coupled between a first voltage source and a second voltage source. The voltage level clamping circuit includes a switch module and a comparator module. The comparator module has 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 includes a current source module, a first voltage level adjusting circuit module, a second voltage level adjusting circuit module, and a comparing circuit module.
Claims9
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 the output signal, the comparing circuit module comprising:
- a first switch module, coupled to the third voltage source, for selectively 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.
Dependencies are inferred from the claim text.