Patent ID: 7209017

Claim:
A Symmetrical voltage controlled oscillator system comprising: 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, the core circuit having at least one inductance module for providing a predetermined inductance, wherein the band tuning circuit includes: a first and a second tuning modules having a first and a second predetermined capacitances coupled to the first and second outputs on their first ends respectively; a first and a second resistors coupled in a series and further coupled serially between second ends of the first and second tuning modules with a mid point between the two resistors controlled by the band tuning signal: a first and a second switches coupled in series and further coupled serially between seconds ends of the first and second tuning modules, and wherein when the switching signal is applied to gates of the switches, the first and second tuning modules are enabled, wherein upon asserting the switching 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 upon adjusting the frequency signal, and the band tuning signal, and wherein all elements of the voltage controlled oscillator system are arranged in a substantially symmetrical fashion.