Patent ID: 7512389

Claim:
An active inductor comprising: a first and a second capacitance, each having a first and a second end; a first, a second, a third, and a fourth voltage line; a first, a second, and a third transistive element, each transistive element comprising an input, an output, and a control; and a nonlinear circuit element comprising an input and an output, wherein the output of said first transistive element is electrically connected to an output port and to the input of said second transistive element, the control of said second transistive element is electrically connected to said first voltage line and to the first ends of said first and second capacitances, the first ends of said first and second capacitances are electrically connected together, the output of said second transistive element is electrically connected to the input of said third transistive element, the second end of said second capacitance is electrically connected to the control of said first transistive element and to said second voltage line, the second end of said first capacitance is electrically connected to the output of said third transistive element and to said third voltage line, the input of said first transistive element is electrically connected to said fourth voltage line and to the input of said nonlinear circuit element, and the output of said nonlinear circuit element is electrically connected to the control of said third transistive element, wherein said nonlinear circuit element comprises a bipolar transistor arranged in diode and having an emitter for the output and a collector for the input and further comprising a base, the base being electrically connected to the collector.