Patent ID: 8058880

Claim:
An analyzer for measuring passive intermodulation (PIM) comprising: a signal sweep generator; a first signal source providing a signal with a first frequency F 1 , the first signal source connected to the signal sweep generator to provide an offset sweep signal on the frequency F 1 at the output of the first signal source; a second signal source providing a second signal with a second frequency F 2 ; a signal combiner having a first input connected to the first signal source, a second input connected to the second signal source and an output providing a signal combining the first signal and the second signal to provide an output signal with frequencies F 1 and F 2 to a test port that can be connected to a PIM source; a frequency multiplier connected to the output of the first signal source for multiplying the frequency of the first signal source by two to provide an output of frequency 2F 1 ; a reference signal mixer having a first input connected to the output of the second signal source, a second input connected to the output of the frequency multiplier and an output providing a reference signal having a frequency of 2F 1 âˆ’F 2 ; a reference signal passband filter having an input connected to the output of the reference signal mixer and having an output; a reflected signal passband filter having an input connected to the test port, the reflected signal passband filter for providing a reflected signal of frequency 2F 1 âˆ’F 2 from the test port to its output; a LO signal source for generating a signal with frequency 2F 1 âˆ’F 2 plus an intermediate frequency (IF) offset signal frequency; a reference signal downconversion mixer having a first input connected to the output of the LO signal source, a second input connected to the output of the reference signal passband filter and having an output providing a reference test signal; and a reflected signal downconversion mixer having a first input connected to the output of the LO signal source, a second input connected to the output of the reflected signal passband filter and having an output providing a reflected test signal.