A signal processing system and method with adjustable multi-channel bandwidth and gain

Abstract

The invention discloses a multi-channel bandwidth and gain adjustable signal processing system and method, and belongs to the technical field of electronics. The system comprises a low-pass module which is used for the low-pass filtering of a microwave voltage signal; a control module which performs channel gating on a first analog switch chip signal according to an upper computer signal and a '1'or '0' signal transmitted by a voltage comparator, and selects different to-ground resistances of an adjustable gain amplifier; the adjustable gain amplifier which amplifies the microwave voltage signal after gain and bandwidth selection and transmits an output voltage signal to the voltage comparator; and the voltage comparator which is used for judging whether the output voltage signal reachesa reference level or not, outputting the '1' signal to the control module if the output voltage signal reaches the reference level, and outputting the '0' signal if the output voltage signal does notreach the reference level. According to the present invention, the gain and the bandwidth are independently adjusted, the dynamic range of a microwave receiver is wider, and the signal stability is not influenced.

Description

technical field [0001] The invention belongs to the field of electronic technology, and more specifically relates to a signal processing system and method with adjustable multi-channel bandwidth and gain. Background technique [0002] In the receiver, the adjustable gain circuit is widely used, which makes it possible to debug the signal with a large dynamic range. At the same time, the appearance of the adjustable bandwidth circuit greatly reduces the noise floor of the receiver, making it possible to develop a high signal-to-noise ratio receiver. [0003] At present, gain and bandwidth adjustable circuits are divided into two types: analog modulation and digital modulation. Digital modulation mainly uses the digital potentiometer to change the resistance value and cooperate with the operational amplifier to change the gain. At the same time, the resistance value in the resistance-capacitance filter circuit can also be changed to control the bandwidth. The advantage is that...

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Problems solved by technology

[0004] In view of the defects of the prior art, the purpose of the present invention is to provide a signal processing system and method with adjustable multi-channel bandwidth and gain, aiming at solving the problem that the analog modulation of the gain and bandwidth of the existing microwave signal cannot change the capacitance value and cause the bandwidth to change It can only be adjusted by the resistance value, but the change of the resistance value can only adjust the microwave signal bandwidth and gain within a small range

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