Boosting varactor capacitance ratio

摘要

A voltage controlled oscillator comprises a negative resistance, a first inductor, a fixed capacitor, and a frequency control component. The frequency control component comprises at least one varactor and at least a second inductor connected in series with the at least one varactor. A magnitude of an inductance of the second inductor is selected such that the frequency control component has an effective capacitance range larger than a capacitance range of the at least one varactor.

主权项

1. An apparatus comprising:
a frequency control component comprising:
two or more varactors;a first inductor connected in series with a first one of the two or more varactors; andat least a second inductor connected in series with a second one of the two or more varactors; wherein magnitudes of inductance of the first inductor and the second inductor are selected such that the frequency control component has an effective capacitance range larger than a capacitance range of the two or more varactors; wherein the magnitudes of inductance of the first inductor and the second inductor are selected based at least in part on quality factors of the first varactor and the second varactor, respectively; wherein the two or more varactors comprises a plurality of switched capacitors, and further comprising: a plurality of inductors connected in series with respective ones of the plurality of switched capacitors; and a plurality of negative resistance elements spatially distributed within respective distances of the plurality of switched capacitors.