Patent ID: 7751164

Claim:
A circuit that provides electrostatic discharge (ESD) protection and that rejects an image frequency, said circuit comprising: a first input pad; an ESD protection circuit that: provides ESD protection; and comprises an ESD capacitance and M transistors with at least one shared drain, where M is an integer greater than 1; a resonant circuit that: communicates with said first input pad and said ESD protection circuit; and in combination with said ESD protection circuit, resonates at said image frequency to reject signal energy at said image frequency, wherein said M transistors include n gates and n/2 drains, where n is an even integer greater than or equal to 2; and X resistors that communicate with said n/2 drains, where X is an integer greater than or equal to 1, wherein said X resistors are connected to ones of said n/2 drains to tune said combination of said ESD protection circuit and said resonant circuit to reject said signal energy at said image frequency.