A circuit and method for automatic adjustment of intermediate frequency signal power

Abstract

The present invention proposes an automatic adjustment circuit for intermediate frequency signal power, including: a protection circuit, a power amplification unit, a voltage-controlled attenuation unit, an intermediate frequency filter unit, a power divider, a peak detection unit, a sampling and holding unit, a voltage comparison unit, and an overload protection unit . The present invention proposes an intermediate frequency signal power automatic adjustment circuit and method, which can adjust the intermediate frequency signal with a large power variation range to the target power range, so that the power dynamic range of the input radio frequency signal is greatly increased, and the processing capacity of the instrument is improved; at the same time, the design An overload protection circuit is installed, which can increase the attenuation of the intermediate frequency signal when the power is overloaded, effectively protecting the back-end channel circuit from damage.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to an intermediate frequency signal power automatic adjustment circuit, and also relates to an intermediate frequency signal power automatic adjustment method. Background technique [0002] With the development of radio technology, the frequency of microwave signals used by people is getting higher and higher, reaching the frequency band of terahertz. Because high-frequency signals have the characteristics of fast transmission speed and large amount of data, when processing high-frequency signals, it is necessary to move the high-frequency signals to intermediate frequency signals for processing by down-mixing. The frequency of intermediate frequency signals is generally in the tens of megahertz to between hundreds of megahertz. The frequency of the intermediate frequency signal is moderate, and most analog devices can work in the intermediate frequency band. Therefore, in the desi...

AI Technical Summary

Problems solved by technology

[0006] (1) A special power detection device is required, that is, a power sensor. The disadvantage of the power sensor is that the measurement data varies greatly with temperature, so parameter calibration needs to be performed under various temperature conditions, which makes the channel design very complicated. Increased cost while taking up CPU resources

[0007] (2) The traditional intermediate frequency signal power adjustment circuit needs to be fed back by the CPU unit to adjust the power control channel, the processing time is slow, and it cannot meet the high-speed changing signal processing requirements

[0008] (3) Multiple DACs, power sensors, CPU modules, etc. are required, and the cost is relatively high

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