Patent ID: 8224250

Claim:
A method for calibrating a transmitter circuit in a wireless communications system, the method comprising: in a single chip comprising a radio frequency (RF) transmitter and an RF receiver, generating an output signal at an output of one or more power amplifiers in said RF transmitter in response to one or more generated input signals; generating within a single feedback mixer circuit in said single chip, a feedback signal by performing a frequency mix-down operation on said generated output signal; and selectively inserting said generated feedback signal at one or more insertion points in said RF receiver utilizing one or more switches according to one of a normal operating mode and a calibration mode, wherein each of said one or more insertion points is located between a mixer stage of said RF receiver and one or more circuits within said single chip that generate a baseband signal based on said generated feedback signal, and wherein said mixer stage of said RF receiver is separate from said single feedback mixer circuit, and wherein selectively inserting according to said calibration mode comprises configuring a closed feedback loop comprising said RF transmitter and a portion of said RF receiver defined by said one or more insertion points.