Bypass circuit of low noise amplifier

A low-noise amplifier and bypass circuit technology, applied in the field of radio frequency communication, can solve problems such as inconvenience in practical use, and achieve the effects of low cost, high reliability and small circuit volume

Inactive Publication Date: 2012-03-28
MOBILE ANTENNA TECH SHENZHEN
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In summary, the existing low-noise amplifier bypass circuit obviously has inconvenience and defects in actual use, so it is necessary to improve it

Method used

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  • Bypass circuit of low noise amplifier
  • Bypass circuit of low noise amplifier
  • Bypass circuit of low noise amplifier

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0024] see image 3 , the present invention provides a low-noise amplifier bypass circuit, which is mainly used in the radio frequency front-end of a communication system receiver. The connection point A of 20 is used as the common radio frequency input end of the two, and the output end of the low noise amplifier 10 and the bypass circuit 20 is all connected to a switch 30 to form a common radio frequency output end, thereby, when the system needs or the low noise amplifier 10 When there is an abnormality in the channel, it can be switched to the bypass working state through the internal switch 3...

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Abstract

The invention discloses a bypass circuit of low noise amplifier. The low noise amplifier and the bypass circuit have a common radio frequency input end, and the output ends of the both are connected to the same changeover switch to form a common radio frequency output end; the low noise amplifier has at least one amplification tube; the bypass circuit is connected with at least one PIN tube, and one end of the PIN tube is connected with the bypass circuit to form a connecting end; the connecting end is connected with the radio frequency input end through 1/4 of wavelength; and the other end of the PIN tube is grounded. Preferably, the amplification tube has high input impedance property and strong reflection characteristic of radio frequency signal in the case of interruption of power supply. Therefore, the bypass circuit of low noise amplifier can greatly reduce volumes of the low noise amplifier and the bypass circuit thereof, decrease cost and improve reliability.

Description

technical field [0001] The invention relates to the technical field of radio frequency communication, in particular to a bypass circuit of a low noise amplifier. Background technique [0002] The low noise amplifier is a key component of the wireless communication system, which is mainly used in the radio frequency front end of the receiver of the wireless communication system, and plays a key role in the performance of the receiving system. With the continuous improvement of reliability performance requirements, some communication systems require the low noise amplifier channel to have a signal bypass function. Provide the best path to ensure the normal operation of the base station. In today's environment where mobile communication continues to develop and operating costs are constantly being compressed, it is necessary to achieve better circuit performance and higher reliability with the lowest cost and smallest volume. Therefore, a new low-cost Noise, low cost and high...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/52H03F1/26H03F3/191H03F3/24H03F3/72H04B1/18
Inventor 雷小勇闫亚琴
Owner MOBILE ANTENNA TECH SHENZHEN
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