Patent ID: 7848453

Claim:
A method for reducing a power of an image signal in a transmitter output signal, comprising: providing a first local oscillator signal to a first buffer amplifier to produce a first mixing signal and providing a second local oscillator signal to a second buffer amplifier to produce a second mixing signal; mixing a first input signal with the first mixing signal to produce a first output signal and mixing a second input signal with the second mixing signal to produce a second output signal; summing the first output signal and an inverted version of the second output signal to produce the transmitter output signal, wherein the transmitter output signal includes the image signal; detecting the image signal in the transmitter output signal; and adjusting a phase of at least one mixing signal based on the power of the image signal such that a difference between a phase of the first mixing signal and a phase of the second mixing signal is approximately equal to 90°, wherein adjusting the phase of the first mixing signal comprises adjusting a capacitive load of the first buffer amplifier based on the power of the image signal.