Kirkpatrick & Lockhart Preston Gates Ellis LLP
Symmetrical linear voltage controlled oscillator
A system is provided to improve frequency stability and system linearity in voltage controlled oscillators. A symmetrical voltage controlled oscillator system embodying the present invention comprises a frequency tuning circuit for receiving a frequency tuning signal, a band tuning circuit coupled with the frequency tuning circuit in a parallel fashion having at least one switching circuit for receiving at least one band tuning signal and at least one switching signal, a core circuit coupled with the frequency tuning circuit and the band tuning circuit for providing a first output and a second output that are complementary to each other, wherein upon asserting the switching signal, and upon adjusting the frequency tuning signal and the band tuning signal, the switching circuit is enabled for configuring the band tuning circuit to join the frequency tuning circuit for determining a predetermined output frequency based on a total inductance and total capacitance provided by the core circuit, the frequency tuning circuit and the band tuning circuit.
VIA Technologies, Inc.
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Bour-Yi Chih-Long Ming-Chieh
Sze Ho Huang