Patent ID: 7161358
Filing Date: 2007-01-09
Classification: G01R

Abstract:
1. An impedance analyzer comprising: a reference signal; a first converter; a first coupler that couples the reference signal to the first converter, the first converter producing a reference intermediate frequency signal; a second converter; a second coupler that couples a reflected signal to the second converter, the second converter producing a reflected intermediate frequency signal; a modification circuit; a reference signal detector; and, a reflected signal detector; wherein a reflection coefficient for a device under test is determined by using a reflected value detected by the reflected signal detector and a reference value detected by the reference signal detector; wherein in a first operating mode of the impedance analyzer, the reflected intermediate frequency signal is forwarded directly to the reflected signal detector; and, wherein in a second operating mode of the impedance analyzer, the modification circuit operates on the reference intermediate frequency signal to produce an adjustment signal that is combined with the reflected intermediate frequency signal before a resulting signal is forwarded to the reflected signal detector.