LNA and LNA signal amplification method by LNA

Abstract

The invention relates to the communication field and discloses an LNA and an LNA signal amplification method by the LNA. The LNA comprises an input impedance-matching amplification circuit and an output resonance frequency-selection circuit. The input impedance-matching amplification circuit is connected with the output resonance frequency-selection circuit and used for inputting signals with two different frequencies and performing impedance-matching and amplification. The output resonance frequency-selection circuit is used for outputting signals with at least two different frequencies subjected to impedance-matching and amplification based on frequencies. The LNA and an LNA signal amplification method by the LNA have following beneficial effects: the LNA can be used for amplifying signals with at least two different frequencies by adoption of a novel circuit structure and an implementation scheme; if the LNA is applied to a radio frequency front end of a GNSS multi-mode multi-frequency receiver so that the radio frequency front end of the GNSS multi-mode multi-frequency receiver is compatible with all frequency bands of GNSS; and the radio frequency front end adopts a small chip and is low in cost.

Description

technical field [0001] The present invention relates to the communication field, in particular to an LNA (Low Noise Amplifier, low noise amplifier) ​​and a method for amplifying signals by the LNA. Background technique [0002] Currently, the radio frequency points used by GNSS (Global Navigation Satellite System, Global Navigation Satellite System) are shown in Table 1. [0003] Table 1 [0004] GNSS mode Frequency Unit (MHz) GPS L1 1575.42 MHz Galileo 1575.42 MHz BeiDou B1 1561.098 MHz BeiDou B2 1207.14 MHz BeiDou B3 1268.52 MHz Glonass 1601.718 MHz [0005] Among them, GPSL1 is used by the satellite navigation system of the United States, and the working frequency is 1575.42MHZ; Galileo is used by the satellite navigation system of the European Union, and the working frequency is also 1575.42MHZ; The frequencies are 1561.098 MHz, 1207.14 MHz and 1268.52 MHz...

AI Technical Summary

Problems solved by technology

However, the LNA in the prior art adopts a load-in-load-out circuit scheme, specifically as figure 1 As shown, such an LNA can only amplify the radio frequency signals of GPSL1, BeidouB1, Galileo and Glonass, which are the same or close to the frequency, and cannot simultaneously amplify the radio frequency signals of BeidouB2 and BeidouB3 with lower frequency points, which leads to The RF receiver can only receive signals with a frequency of 1.5MHz ~ 1.6MHz, and cannot receive signals from BeidouB2 and BeidouB3 with lower frequencies

[0008] At present, if the RF receiver product is to support all GNSS frequency bands at the same time, it is necessary to use two sets of chips and more peripheral components. In addition, the price of these peripheral components is also relatively expensive, so the cost of the entire RF front-end will increase

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