Patent ID: 7009446

Claim:
A filter circuit, comprising: a filter input terminal; a filter output terminal; an input terminating portion connected to the filter input terminal and a first node, comprising: a first voltage controlled current source having an input terminal connected to the filter input terminal and an output terminal, wherein a mutual conductance of the first voltage controlled current source is gm; and a second voltage controlled current source having an input terminal connected to the output terminal of the first voltage controlled current source and an output terminal connected to the first node and the input terminal of the second voltage controlled current source, wherein a mutual conductance of the second voltage controlled current source is minus gm; an inductor portion connected to the first node and a second node, comprising: a third voltage controlled current source having an input terminal connected to the first node and an output terminal connected to a third node, wherein a mutual conductance of the third voltage controlled current source is two times gm; a fourth voltage controlled current source having an input terminal connected to the third node and an output terminal connected to the input terminal of the third voltage controlled current source, wherein a mutual conductance of the fourth voltage controlled current source is half of minus gm; a fifth voltage controlled current source having an input terminal connected to the third node and an output terminal connected to the second node, wherein a mutual conductance of the fifth voltage controlled current source is gm; and a sixth voltage controlled current source having an input terminal connected to the output terminal of the fifth voltage controlled current source and an output terminal connected to the input terminal of the fifth voltage controlled current source, wherein a mutual conductance of the sixth voltage controlled current source is minus gm; and an output terminating portion connected to the second node and the filter output terminal, comprising; a seventh voltage controlled current source having an input terminal connected to the second node and an output terminal connected to the filter output terminal of the filter circuit and the input terminal of the seventh voltage controlled current source, wherein a mutual conductance of the seventh voltage controlled current source is minus gm.