Agilent offers two mixer families: the 110-GHz 11970 Series harmonic mixers and the 75-GHz 11974 Series preselected mixers. Both families feature flat frequency response and low conversion loss. No bias or tuning adjustments are required, and each mixer is calibrated over its full range of operating frequencies. In addition, the 11974 Series preselected mixers eliminate the time-consuming signal-identification process required with harmonic mixers, in which the many images and harmonics created by the mixing process must be removed from the display to identify the signal of interest.
When used with the 11970 Series harmonic mixers or unpreselected third-party mixers, a PSA analyzer provides two ways of performing signal identification: image shift and image suppression. The image-shift method moves the signals by a factor that equals the intermediate frequency (IF) divided by a user-specified harmonic number. Only the desired signal will shift by the correct amount. The image-suppression technique (patented by Agilent) automatically suppresses all images that are not the true signal, leaving only the desired signal on the screen
