High-frequency low-power-consumption true logarithmic amplifier

Abstract

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.

Description

technical field [0001] The invention belongs to the field of integrated circuits, and in particular relates to a high-frequency and low-power true logarithmic amplifier. Background technique [0002] The true logarithmic amplifier is an important device in the receiving system. Its function is to compress the large dynamic signal received in the receiving channel into a signal with a smaller dynamic range for subsequent circuits (such as AD analog-to-digital conversion) to process. [0003] The traditional true logarithmic amplifier adopts a dual-gain circuit structure, and several stages of double-gain units (TLA) are cascaded to form a true logarithmic amplifier, such as figure 1 shown. The dual-gain unit (TLA) consists of a high-gain limiting amplifier, a unity-gain amplifier GL, and an output stage. The traditional true logarithmic amplifier circuit, limited by its structure, has low frequency (the current maximum operating frequency is 500MHz), high power consumption ...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a high-frequency and low-power true logarithmic amplifier to solve the problems of low operating frequency, high power consumption and large volume of the current true logarithmic amplifier

Images