Patent ID: 6801097
Filing Date: 2004-10-05
Classification: H03B,H03J,H03L

Abstract:
A Voltage Controlled Oscillator (VCO) comprising:an amplifier; and a circuit electrically connected to the amplifier such that the amplifier produces an output signal at a resonant frequency of the circuit; wherein the circuit receives a first control signal for determining, in part, a frequency band of the resonant frequency, and a second control signal for determining, in part, the resonant frequency within the frequency band; wherein the circuit comprises: a first reactance circuit, wherein a first reactance is determined by first control signal; and a second reactance circuit electrically connected in parallel to the first reactance circuit, wherein a second reactance is determined by the second control signal, wherein; the first reactance circuit comprises a first varactor in series with a second varactor, a cathode of the first varactor electrically connected to a cathode of the second varactor, and wherein the first control signal is received at the electrical connection of the cathodes of the first and second varactors; and the second reactance circuit comprises a third varactor in series with a fourth varactor, a third varactor cathode electrically connected to a fourth varactor cathode, and wherein the second control signal is received at the electrical connection of the third and fourth varactor cathodes.