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Sampling feedback control low-noise amplifier

A low-noise amplifier and feedback control technology, applied in the direction of improving the amplifier to reduce the influence of noise, etc., can solve the problem that the output gain of the CDMA low-noise amplifier cannot be adjusted in real time, and achieve the effect of extending the output range

Inactive Publication Date: 2015-03-18
罗芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical defect that the output gain of the CDMA low noise amplifier cannot be adjusted in real time in the prior art, the present invention provides a sampling feedback control low noise amplifier

Method used

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  • Sampling feedback control low-noise amplifier

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Embodiment Construction

[0014] A specific embodiment of the present invention is given below.

[0015] The sampling feedback control low noise amplifier comprises an input amplification stage and an attenuation stage, and a third amplifier connected with the attenuation stage, the output of the third amplifier is connected with an output isolator, and also includes a wave detector and a digital signal processing unit, so The input end of the detector is connected with the output end of the third amplifier, the output end of the detector is connected with the digital signal processing unit, and the digital signal processing unit is connected with the attenuation stage control.

[0016] Preferably, the attenuation stage includes a digitally controlled attenuator and a voltage-controlled attenuator connected to the digital signal processing unit.

[0017] Preferably, the output isolator is an active signal isolator.

[0018] Preferably, the input amplifier stage includes an input isolator, a first amp...

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Abstract

The invention relates to a sampling feedback control low-noise amplifier. The sampling feedback control low-noise amplifier comprises an input amplification stage, an attenuation stage and a third amplifier which is connected with the attenuation stage, wherein an output end of the third amplifier is connected with an output isolator. The sampling feedback control low-noise amplifier further comprises a detector and a digital signal processing unit, wherein an input end of the detector is connected with an output end of the third amplifier, an output end of the detector is connected with the digital signal processing unit, and the digital signal processing unit is connected with the attenuation stage in a controlling manner. The sampling feedback control low-noise amplifier provided by the invention has the advantages that the attenuation coefficient of the attenuation stage can be controlled by sampling a signal and inputting the signal into an MCU (Micro Control Unit) through the detector, the output gain is regulated in real time, the output range is expanded, and the amplifier can be applied to a wider band.

Description

technical field [0001] The invention belongs to the field of electronic communication and relates to a sampling feedback control low noise amplifier. Background technique [0002] Mobile communication technology is the product of the highly developed and mutual integration of modern communication technology and computer technology. With the wide application of digital information technology, modern communication technology is developing at an unprecedented high speed, and mobile communication is also developing along the direction of multi-access communication. Compared with FDMA (Frequency Division Multiple Access) and TDMA (Time Division Multiple Access), CDMA (Code Division Multiple Access) has the advantages of large system capacity, flexible configuration, high spectrum utilization rate, soft handover, and good security performance. Based on these advantages, CDMA technology has been widely used. [0003] As the first stage of CDMA receiver, CDMA low noise amplifi...

Claims

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Application Information

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IPC IPC(8): H03F1/26
Inventor 罗芳
Owner 罗芳