Patent ID: 7068130

Claim:
An active inductor circuit comprising: first and second inductor terminals for coupling to respective external terminals, said first and second inductor terminals being coupled to a first transconductance circuit; a second transconductance circuit; a feedback circuit; an output terminal of said first transconductance circuit being coupled to an input terminal of said second transconductance circuit; an output terminal of said second transconductance circuit being coupled to an input terminal of said first transconductance circuit via said feedback circuit; and a capacitor coupled between said output terminal of said first transconductance circuit and said second inductor terminal, wherein said active inductor circuit further includes a third transconductance circuit, an output terminal of which is coupled to an input terminal of a fourth transconductance circuit included in said active inductor circuit, and to a second capacitor, a second terminal of which is coupled to the first terminal of said active inductor circuit, an output terminal of said fourth transconductance circuit being coupled to an input terminal of said third transconductance circuit via a second feedback circuit of said active inductor circuit, said active inductor circuit further including a first unidirectional device coupled between said first terminal and said second transconductance circuit, said active inductor circuit further including a second unidirectional device coupled between said second terminal and said fourth transconductance circuit.