Device effectively inhibiting generation of spurious broadband signal

Abstract

The invention belongs to the technical field of spurious signal inhibition, and specifically discloses a device effectively inhibiting generation of a spurious broadband signal. The device comprises apower noise acquisition circuit, a differential amplification circuit, and an automatic tuning circuit. An output end of the power noise acquisition circuit is connected with an input end of the differential amplification circuit. An output end of the differential amplification circuit is connected with an input end of the automatic tuning circuit. After the power noise acquisition circuit acquires power noise of signals emitted by a signal emission device, the power noise is fed back to the differential amplification circuit, to inhibit the power noise. The Inhibited signals are input to theautomatic tuning circuit. Resonant frequency of the automatic tuning circuit is regulated to be consistent with emission frequency of the signal emission device, so as to output the broadband signalswithout spurious signals. The device is simple in operating principle, and can realize frequency automatic tuning and power noise automatic feedback, and spurious signal inhibition efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of spurious signal suppression, and relates to a device for effectively suppressing spurious broadband signal generation. Background technique [0002] In the process of radar signal generation, the baseband signal generated by DDS has low frequency and narrow bandwidth, which cannot meet the requirements of radar. In order to obtain wideband and low spurious signals, the baseband signal is usually generated by multiple frequency multiplication such as 16 times or even 32 times of frequency multiplication. This method has complex circuits, low reliability and high cost. Therefore, in the generation of signals with relatively wide bandwidth and low spur requirements, how to effectively suppress spurs becomes the design focus of signal generation. [0003] Chinese Patent No. 201310624235.3 discloses a method for effectively suppressing spurious broadband signal generation. Its advantage is that by changing th...

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Problems solved by technology

[0003] Chinese Patent No. 201310624235.3 discloses a method for effectively suppressing spurious broadband signal generation, which has the advantage of effectively suppressing the generation of in-band spurs in the process of broadband down-conversion by changing the use of the mixer port. In the process of signal generation, it is easily affected by power supply noise, and this method cannot eliminate the influence of power supply noise

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