Patent ID: 9537447
Date: 2017-01-03
CPC Classifications: H03B

Claim:
1. A voltage controlled oscillator (VCO) comprising: a VCO core; a tunable capacitance element having a first terminal coupled to an emitter node of the VCO core and a second terminal coupled to a tuning node; a VCO frequency coupling circuit coupled between the emitter node of the VCO core and the tunable capacitance element, the VCO frequency coupling circuit configured to provide a signal path at a frequency of oscillation, wherein the VCO frequency coupling circuit comprises a first capacitor having a first terminal coupled to an emitter terminal of the VCO core, and a first transmission line element having a first terminal coupled to a second terminal of the first capacitor; and a VCO harmonic coupling circuit coupled between the emitter node of the VCO core and a reference node, the VCO harmonic coupling circuit configured to provide a signal path at a harmonic of the frequency of oscillation of the VCO.