Patent ID: 7415373

Claim:
A method for measuring a balanced input/balanced output frequency translation device under test by using a vector network analyzer and a first reference frequency translation device and a second reference frequency translation device, which are unbalanced input/unbalanced output frequency translation devices, said method comprises: measuring the network characteristics of said first reference frequency translation device by using said vector network analyzer; measuring the network characteristics of said second reference frequency translation device by using said vector network analyzer; determining the phase difference between a first local signal for said first reference frequency translation device and a second local signal for said second reference frequency translation device; synthesizing the network characteristics representing said phase difference that was determined in the measured network characteristics of said second reference frequency translation device; measuring the network characteristics of a circuit comprised of said first reference frequency translation device, said second reference frequency translation device, and said frequency translation device under test using the vector network analyzer, wherein said first reference frequency translation device and said second reference frequency translation device have an operation complementary to said frequency translation device under test; removing the network characteristics of said first reference frequency translation device and the synthesized network characteristics of said second reference frequency translation device from the measured network characteristics of said circuit; and outputting a removal result.