Patent ID: 6763227
Filing Date: 2004-07-13
Classification: H03C,H04L

Abstract:
A method of calibrating a transmitter system having a mixer with a local oscillator input, a baseband input, and an output, the method comprising:applying a first voltage to a first node associated with the local oscillator input; applying a second voltage to a second node associated with the local oscillator input, wherein the second voltage is greater than the first voltage; determining a first offset value corresponding to a voltage applied to the baseband input at which the output is about zero when the first and second voltages are applied to the first and second nodes, respectively; applying a third voltage to the first node associated with the local oscillator input; applying a fourth voltage to the second node associated with the local oscillator input; determining a second offset value corresponding to a voltage applied to the baseband input at which the output is about zero when the third and fourth voltages are applied to the first and second nodes, respectively; and providing a calibration offset value according to the first and second offset values.