Patent ID: 8736392
Filing Date: 2014-05-27
Classification: H03B,H03L

Abstract:
1. An apparatus for generating a signal having a controlled oscillation frequency at a pair of output nodes, the apparatus comprising: a first transistor and a second transistor, wherein a first drain of the first transistor is coupled to a first node of the pair of output nodes and a second drain of the second transistor is coupled to a second node of the pair of output nodes; an inductive-capacitance (LC) tank including a first inductor coupled in parallel with a first capacitor, wherein the LC tank is coupled to a first gate of the first transistor and to a second gate of the second transistor, and wherein the first inductor is configured to receive a biasing voltage; a second inductor and a second capacitor having a selectable capacitance coupled to the pair of output nodes, the second capacitor being coupled to the first node of the pair of output nodes and coupled to the second node of the pair of output nodes, the second inductor being magnetically coupled to the first inductor with a coupling coefficient based on a semiconductor process technology; a third transistor and a fourth transistor coupled to the pair of output nodes; and a third inductor coupled to gates of the third transistor and the fourth transistor, the third inductor being magnetically coupled to the second inductor.