High-gain narrowband radio frequency receiver

Abstract

The invention discloses a high-gain narrowband radio frequency receiver. The high-gain narrowband radio frequency receiver includes a radio frequency front-end amplification and filtering circuit, a frequency mixing circuit, a multistage numerical control gain amplification circuit, a first-stage intermediate frequency filter, an N-stage intermediate frequency filter, an ADC matching network and an ADC; the radio frequency front-end amplification and filtering circuit is used for amplifying and filtering radio signals and inputting the amplified and filtered radio signals to the frequency mixing circuit; the frequency mixing circuit is used for performing frequency conversion on the radio frequency signals to obtain intermediate-frequency signals and outputting the intermediate-frequency signals to the first-stage intermediate frequency filter; the first-stage intermediate frequency filter is used for filtering the signals and sending the filtered signals to the multistage numerical control gain amplification circuit; the multistage numerical control gain amplification circuit is used for amplifying the signals and sending the amplified signals to the N-stage intermediate frequency filter; the N-stage intermediate frequency filter is used for filtering the signals and sending the filtered signals to the ADC matching network; and the ADC is used for converting signals outputted by the ADC matching network into digital signals. With the high-gain narrowband radio frequency receiver of the invention adopted, under a condition that blocking signals exist, a high-gain link can maintain unsaturated, sensitivity will not be deteriorated, and gain can be as high as 80db.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a high-gain narrowband radio frequency receiver. Background technique [0002] At present, most communication devices need to support multiple users and multiple frequency points, so the receivers are all designed as broadband receivers. The benefits of wideband receivers are wide communication bandwidth, high data rate, allowing the use of a greater number of carriers, allowing more user communications, and even enabling multi-mode transmission within the same wide frequency band. Taking the GSM communication base station as an example, the frequency band of uplink GSM in China is 880MHz~915MHz. Because the base station needs to support the full frequency band, the passband bandwidth of the uplink receiver of the base station must be 35MHz. Taking the CDMA communication base station as an example, the base station receiver in China needs to support 8 carriers. Taking WC...

AI Technical Summary

Problems solved by technology

Although the digital channel filter can be configured as a narrowband filter in this patent, the analog link is a wideband

In the case of blocking signals, the analog link gain will drop, the sensitivity will deteriorate, and high sensitivity cannot be achieved

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