Patent ID: 6944565

Claim:
A signal analysis instrument, comprising: a computer; a phase shift mechanism comprising: an input for receiving a first high frequency signal; a phase shifter arranged to act on said first high frequency signal to produce a phase-shifted first high frequency signal; a phase shift controller arranged to control operation of the phase shifter in response to instructions from said computer; a receiver mechanism, comprising: a mixer responsive to the phase-shifted first high frequency signal and to a second high frequency signal to produce a mixer output signal therefrom; a first signal conditioning circuit responsive to the mixer output signal to produce a receiver output signal; a data acquisition mechanism responsive to the receiver output signal, the computer being connected to the data acquisition mechanism to receive data therefrom; said computer arranged to control said phase shifter and to analyse data from said data acquisition mechanism to determine a position of said phase shifter corresponding to said mixer being phase-sensitive, and to determine a conversion ratio of said receiver mechanism.