System and method for a voltage controlled oscillator

摘要

In accordance with an embodiment, a voltage controlled oscillator (VCO) includes a VCO core having a plurality of transistors, a bias resistor coupled between collector terminals of the VCO core and a first supply node, and a varactor circuit coupled to emitter terminals of the VCO core. The bias resistor is configured to limit a self-bias condition of the VCO core.

主权项

1. A voltage controlled oscillator (VCO) comprising:
a VCO core comprising a plurality of transistors; a bias resistor coupled between collector terminals of the VCO core and a first reference node, wherein the bias resistor is configured to limit a self-bias condition of the VCO core; and a varactor circuit coupled to emitter terminals of the VCO core, wherein the varactor circuit comprises
a first capacitor having a first terminal coupled to an emitter node of the VCO core,a first transmission line element having a first terminal coupled to a second terminal of the first capacitor,a first varactor diode having a first terminal coupled to a second terminal of the first transmission line elememt and a second terminal coupled to a tuning node, andan RF choke circuit coupled between a second terminal of the first capacitor and a second reference node.