The invention provides a high-frequency low-power-consumption true logarithmic
amplifier. The high-frequency low-power-consumption true logarithmic
amplifier comprises a power divider circuit, an attenuator, a logarithmic
detector amplifying circuit, a slope adjusting circuit, an amplitude limiting amplifying circuit, a match circuit and an amplitude conditioning circuit, wherein input signals aredivided by the power divider circuit into two ways to transmit the input signals to the attenuator and the amplitude limiting amplifying circuit; the input signals are attenuated through the attenuator to adjust initial points of logarithmic detectors; the input signals after attenuation are subjected to
detector amplification
processing through the logarithmic
detector amplifying circuit to output video signals with the logarithmic relationship with input
signal amplitude; the slope of the video signals is adjusted through the slope adjusting circuit, and the video signals after adjustment are transmitted to an amplitude conditioning circuit; the amplitude limiting amplifying circuit carries out amplitude limiting amplifying
processing on the input signals; the input signals after amplitude limiting amplifying
processing are matched and output to the amplitude conditioning circuit; the amplitude conditioning circuit carries out amplitude adjustment on the input signals after amplitude limiting amplifying processing according to the change rule of the video signals after adjustment, and radio-frequency signals changed according to the logarithm rule are output. The true logarithmic
amplifier is high in working frequency, low in
power consumption and small in area.