Short wave broadband receiver

Abstract

The invention provides a short wave broadband receiver, which mainly comprises an analog output circuit and a digital output circuit connected with the analog output circuit, wherein the analog output circuit mainly comprises an amplitude limiting circuit, an input low pass filter, a mode selection assembly circuit, a band-pass filter assembly, an attenuator circuit, an output low pass filter and an output low noise amplifier which are connected sequentially; and the output low noise amplifier is connected with the digital output circuit. The short wave broadband receiver has beneficial effects of high scanning speed, no mirror image or intermediate frequency and no local oscillator phase noise, very suitability for broadband application, no interference signals generated by a local oscillator or frequency mixer, high linearity and low power consumption, less core parts and higher MTBF (Mean Time Between Failures).

Description

technical field [0001] The invention belongs to the technical field of electronic information, and specifically refers to a short-wave broadband receiver. It is mainly used in radio monitoring and broadband receivers in the communication industry. Background technique [0002] The zero-IF receiver is similar to the direct conversion receiver, and its main feature is that it has a phase-locked module to eliminate the local oscillator deviation, so it is more suitable for burst high-speed communication. The main factors affecting its performance are the isolation, dynamic range and noise figure of the quadrature mixer, the amplitude and phase imbalance of the I / Q path, and the deviation of the transceiver frequency and clock. [0003] Zero-IF receivers are highly integrated, do not require IF filters and frequency converters, and often use direct conversion solutions with low cost. However, designing zero-IF receivers in the VHF band will become very complicated and difficult...

AI Technical Summary

Problems solved by technology

[0012] 3) Even harmonic distortion reduces sensitivity

[0013] 4) Low radiation has stricter requirements on LO leakage indicators

[0014] 5) In general, the dynamic range is lower than the other two structures

If the DC cancellation technique is not applied, this scheme can only be used in modulation schemes without DC components; because the carrier of the zero-IF receiver is in the radio frequency band, carrier recovery becomes very difficult and can only be used in non-coherent detection In the scheme; the zero-IF receiver is very sensitive to I / Q imbalance, and it is difficult to ensure a good I / Q balance with the I / Q modulator implemented by discrete devices

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