Patent ID: 8072280

Claim:
A voltage-controlled oscillator comprising: a variable inductor comprising: a transformer comprising a primary side coil and a secondary side coil, the primary side coil comprising a first coil and a second coil, the first coil being connected in series with a second coil, the secondary side coil comprising a third coil and a fourth coil, the third coil being connected in series with the fourth coil; and a transistor switch connected in parallel with the primary side coil to adjust an inductance value of the variable inductor based on a gate voltage; a negative impedance circuit connected in parallel with the secondary side coil to compensate power consumption of the voltage-controlled oscillator during oscillation; an operating voltage source electrically connected between the third coil and the fourth coil; and a ground point electrically connected between the first coil and the second coil; wherein the oscillation frequency of the voltage-controlled oscillator is controlled by the inductance value, and the transistor switch is an array of field effect transistor switches.