Patent ID: 6396356
Filing Date: 2002-05-28
Classification: H03B,H03C,H03L

Abstract:
A method of modulating a voltage controlled oscillator (VCO) system having an inductor, a first varactor controlled by a first variable voltage being connected in parallel to the inductor and a second varactor controlled by a second variable voltage being connected in parallel to the first varactor, comprising:setting the first variable voltage of the first varactor to a first voltage, setting the second variable voltage of the second varactor to a second voltage in a normal condition; setting both the first and the second varactors to the first voltage in a positive deviation condition; and setting both the first and the second varactors to the second voltage in a negative deviation condition; wherein a frequency deviation of the system is linear in response to a voltage deviation from the normal condition to either the positive deviation condition or negative deviation condition.