A kind of ultra-short wave radio receiving signal processing circuit

Abstract

The invention discloses a received signal processing circuit of an ultra-short wave radio set. The circuit is composed of a mixer, an intermediate frequency buffer circuit, a first crystal filter, an intermediate frequency amplifier, a second crystal filter, a demodulator, a pilot frequency detection circuit, a third filter, a baseband signal amplifier and a self-checking circuit, wherein a received radio frequency signal and a received local oscillator signal are mixed by the mixer and then transmitted to the intermediate frequency buffer circuit via the output end; the mixed signal is buffered by the intermediate frequency buffer circuit and then input into the first crystal filter via the output end; after being subjected to narrow-band filtering by the first crystal filter, the intermediate frequency signal is input into the intermediate frequency amplifier via the output end; after being amplified in three stages by the intermediate frequency amplifier, the intermediate frequency signal is input into the demodulator via the output end; the demodulator is bidirectionally connected with the second crystal filter; the demodulator inputs the intermediate frequency signal which is amplified for two times and filtered into the baseband signal amplifier; and the baseband signal is output by three lines respectively after being amplified by the baseband signal amplifier.

Description

Technical field: [0001] The invention relates to a receiving signal processing circuit of an ultrashort wave radio station, which is especially suitable for the field of wireless electronic communication. Background technique: [0002] In current radio communication, the wireless signal received by the receiver is a complex signal with high noise and low power. The receiving processing circuit needs to extract the baseband signal from these complex signals, so the performance of the receiving circuit directly affects the performance of the entire wireless communication system. Performance, the traditional receiving signal processing circuit only filters and amplifies the tuning signal once before demodulation, so it is difficult to ensure the reliability and stability of the circuit. Invention content: [0003] The task of the present invention is to provide a receiving signal processing circuit of an ultrashort wave radio station which can monitor the signal strength of t...

AI Technical Summary

Problems solved by technology

[0002] In current radio communication, the wireless signal received by the receiver is a complex signal with high noise and low power. The receiving processing circuit needs to extract the baseband signal from these complex signals, so the performance of the receiving circuit directly affects the performance of the entire wireless communication system. Performance, the traditional receiving signal processing circuit only filters and amplifies the tuning signal once before demodulation, so it is difficult to ensure the reliability and stability of the circuit

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