VARIABLE INDUCTOR HAVING SPIRAL INDUCTOR, VOLTAGE CONTROLLED OSCILLATOR INCLUDING VARIABLE INDUCTOR, AND PHASE LOCKED LOOP INCLUDING VARIABLE INDUCTOR

摘要

A variable inductor includes a spiral inductor over a substrate, the spiral inductor comprising a ring portion. The variable inductor further includes a ground ring over the substrate surrounding at least the ring portion of the spiral inductor and a floating ring over the substrate disposed between the ground ring and the spiral inductor. The variable inductor further includes an array of switches configured to selectively connect the ground ring to the floating ring.;COPYRIGHT KIPO 2015