Fig. 6

L2-channel IF power (right axis) for hot (upward pointing triangles) and cold (downward pointing triangles) load measurements taken at four different mixer bias current settings, showing the mixer gain dependence on the mixer bias current and the mixer current change (dashed lines) due to the direct detection of the broadband thermal radiation of the loads. The relative current change (squares) is given on the left axis. The bias voltage is constant throughout the experiment.
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