3G wireless network signal amplifier, wireless signal amplifier

1. The significance and purpose of the topic.

An amplifier that amplifies a high-frequency small signal (with a center frequency of a few hundred kHz to a few hundred MHz and a spectral width in the range of a few kHz to tens of MHz) is called a high-frequency small signal amplifier.

This kind of amplifier can be divided into transistor, MOSFET and integrated circuit amplifier according to the device used; According to the width of the passing spectrum, it can be divided into narrowband and broadband amplifiers; According to the circuit form, it can be divided into single-stage and cascade amplifiers; According to the nature of the load used, it can be divided into resonant amplifier and non-resonant amplifier.

The so-called resonant amplifier is an amplifier that uses a resonant loop as a load. According to the characteristics of the resonant circuit, the resonant amplifier has a large gain for the signal close to the resonant frequency; For signals far from the resonant frequency, the gain decreases rapidly. Therefore, the resonant amplifier not only has an amplification effect, but also plays a role in filtering or frequency selection.

In the case of a high-frequency small-signal amplifier, it can be assumed to operate in the linear range of a transistor (or field-effect transistor) due to the small signal. This allows the transistor to be considered as a linear element and therefore can be analyzed as an active linear quadruplex network.

A small signal tuning amplifier is a basic unit circuit in a high-frequency electronic circuit, which is mainly used for high-frequency small signal or.

Linear amplification of weak signals. High-frequency small-signal amplifiers are commonly used functional circuits in communication equipment, and the signal frequencies it amplifies are hundreds of kilohertz to hundreds of megahertz. The function of the high-frequency small-signal amplifier is to realize the amplification of the weak high-frequency signal without distortion, and from the perspective of the spectrum contained in the signal, the spectrum of the input signal is the same as the spectrum of the output signal after amplification.

Classification of high-frequency small-signal amplifiers:

According to the components, it is divided into: transistor amplifier, field effect tube amplifier, integrated circuit amplifier;

According to the frequency band, it is divided into: narrowband amplifier, broadband amplifier;

According to the circuit form, it is divided into: single-stage amplifier and multi-stage amplifier;

According to the nature of the load, it is divided into: resonant amplifier and non-resonant amplifier;

Among them, high-frequency small-signal tuning amplifiers are widely used in communication systems and other radio systems, especially at the receiving end of the transmitter, the signal induced from the antenna is very weak, which needs to be amplified by the amplifier. High-frequency signal amplifiers are very simple in theory, but very difficult to make in practice. One of the most common problems is self-oscillation, and frequency selection and impedance matching between stages are also difficult to achieve.

Based on theoretical analysis and actual fabrication, this paper uses LC oscillation circuit as an auxiliary to eliminate the self-oscillation of high-frequency amplifier and achieve accurate frequency selectionIn addition, other circuits are added to realize the impedance matching between the amplifier and the front and rear stages.

The landlord is talented. This is indeed the case in the future. Everyone has a signal receiver in their home. Including your mobile phone, landline and broadband are all received by him. However, it is estimated that it will take at least 3-5 years to become widespread.

It's good, and it doesn't require any technology. The main thing is that the signal in the room is blocked, as long as it can reach out of the house.

Wireless router wireless bridging is a way of signal amplification.

How to set up a wireless router for wireless bridging:

The first wireless router:

1.First, log in to the router that is connected to the Broadband Modem.

2.Set the SSID number and Channel in Wireless Settings - Basic Settings, and set the fixed channel number.

3.Set the wireless signal encryption information in the Wireless Settings - Wireless Security Settings to record the SSID, channel, and encryption settings of the wireless router after setting.

Second Wireless Router:

1.Log in to the second wireless router that needs to be bridged.

2.In the network parameters - LAN port settings, if you change the IP address to be different from the first router (to prevent IP address conflicts), for example, save it, and the router will automatically restart.

4.Select the SSID number of the first router in the list of scanned signals and click "Connect".

5.Set the channel to be the same as the first router's channel. At the same time, set the encryption information to be the same as the first router, click "Save".

6.Shut down the DHCP server. In the DHCP server, select Disable, save, and restart the router.

7.At this point, the first wireless router and the second wireless router have successfully established WDS.