High-performance broadband microwave receiving channel

Abstract

The invention discloses a high-performance broadband microwave receiving channel, which comprises a frequency division circuit, a frequency mixing circuit and a local oscillator circuit, and is characterized in that the frequency division circuit is used for performing frequency division processing on an externally input radio frequency signal, outputting a high-frequency-band radio frequency signal through a high-pass filter branch and outputting a low-frequency-band radio frequency signal through a low-pass filter branch; the frequency mixing circuit comprises a low-frequency-band secondary frequency mixing branch circuit which carries out frequency mixing, amplification and filtering twice on a low-frequency-band signal and outputs a low-frequency-band corresponding intermediate-frequency signal; the high-frequency-band primary frequency mixing branch is used for performing primary frequency mixing, amplification and filtering on the high-frequency-band signal and outputting a high-frequency-band corresponding intermediate-frequency signal; the local oscillator circuit provides local oscillator source clock signals through internal and external switching signals, outputs low-frequency-band secondary frequency mixing branch two-stage local oscillator signals and high-frequency-band primary frequency mixing branch local oscillator signals, and meanwhile provides two sampling clock signals for a rear-stage ultra-high-speed receiving sampling module. The invention has the advantages of high integration level, low stray, large dynamic range, ultra wide band and the like.

Description

technical field [0001] The invention belongs to the field of microwave technology, in particular to a high-performance broadband microwave receiving channel. Background technique [0002] The broadband microwave receiving channel is the core hardware device of broadband microwave communication, which is widely used in broadband radar detection, satellite communication, electronic countermeasures and UAV reconnaissance. Broadband microwave receiving channel design generally adopts channelization technology, which divides the receiver bandwidth into several channels, then suppresses spurious and false signals through up-down conversion, and finally down-converts to low-IF signals that can be sampled and demodulated by A / D. With the rapid development of microwave technology, the microwave receiving channel is required to have the characteristics of high sensitivity, large dynamic, high reliability and small size. [0003] However, the current broadband microwave receiving chan...

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Problems solved by technology

[0005] 2. The input signal of the high-speed receiving sampling module in the rear stage of the broadband microwave receiving channel needs to be within a certain small power range (the quantization random jitter in this power range is small), while the input signal of the receiver has a large dynamic range and must reach High sensitivity requires the input signal to be compressed to a constant level range, and it is difficult to achieve small and large signals without distortion

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