Patent ID: 6741640
Filing Date: 2004-05-25
Classification: G01R,H04B

Abstract:
For use in an RF transceiver comprising an RF transmit path comprising circuitry capable of amplifying an RF signal and transmitting said amplified RF signal to an antenna coupled to said RF transceiver, a system for determining an impedance match of said antenna comprising:a test signal generator coupled to said RF transmit path and capable of generating a first test signal and injecting said first test signal into said RF transmit path, wherein said RF transmit path amplifies said first test signal; an RF mixer coupled to an output of said RF transmit path and capable of down-converting said amplified first test signal to produce a second test signal at a frequency within a receive frequency band of said RF transceiver; an RF coupler coupled to an output of said RF mixer and capable of transmitting said second test signal into said antenna and capable of receiving a reflection of said second test signal; a first signal monitor coupled to said RF coupler capable of measuring said reflection of said second test signal; a second signal monitor coupled to said RF mixer and capable of determining at least one parameter of said second test signal; and a signal splitter coupled to said RF mixer output capable of generating said second test signal on a first split output and a second split output signal on a second split output, wherein said second split output signal is substantially equal to said second test signal.