Patent ID: 7076266
Filing Date: 2006-07-11
Classification: H04B,H04W

Abstract:
1. A system for the control of transmit power in a wireless communication device having a transmitter and a receiver, the receiver having a calibrated receiver signal pathway capable of determining the strength of a received signal, the system comprising: variable gain radio frequency (RF) transmitter amplifier having an amplifier input and an amplifier outnut and a variable gain control input, the variable gain control input initially receiving a control signal indicative of a desired transmit power level; mixer coupled to the amplifier output and receiving a local oscillator signal having an oscillator frequency corresponding to an operational frequency of the receiver, the mixer generating a signal at operational frequency of the receiver and corresponding to a signal at the amplitier output; and a coupling circuit to couple the signal generated by the mixer to the receiver signal pathway to permit power measurement of the signal using the calibrated receiver signal pathway, wherein the receiver signal pathway comprises an intermediate frequency (IF) stage coupled to a demodulator stage, the coupling circuit coupling the signal generated by the mixer to the receiver signal pathway following the IF stage.