Microwave Journal, August 1st, 1989
RF Detector Logarithmic Video Amplifier
Basic of Detector Logarithmic
Video Amplifiers (DLVA)
Figure 1 illustrates the basic detector logarithmic video amplifier. [1,2] The IF/RF signal is detected by the active tunnel diode detector [3,4] and linearly amplified by [A.sub.V]. The resulting signals drive the video logging elements (differential amplifiers). The resulting current [(i.sub.L)] is a logarithmic function of the detected voltages, [e.sub.D] and [A.sub.v.e.sub.D]. The currents from each log stage are summed in [R.sub.L], resulting in an output voltage that is linearly related to ...
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