Grading bypass circuit for tower amplifier and control method thereof

A tower-top amplifier and bypass circuit technology, applied in gated amplifiers, improving amplifiers to improve efficiency, and improving amplifiers to reduce noise effects, etc. problems such as large path loss, to achieve the effect of simplifying the structure, reducing power consumption and reducing loss

Inactive Publication Date: 2010-03-17
COMBA TELECOM SYST CHINA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it is worth noting that A2 is a booster power amplifier. In order to ensure high enough gain and linearity, the noise figure is at least 2dB higher than that of A1 (low noise amplifier). A2 working alone is equivalent to the noise figure of a tower amplifier. As the tower rises, the main role of the tower in the network will also disappear, so this

Method used

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  • Grading bypass circuit for tower amplifier and control method thereof
  • Grading bypass circuit for tower amplifier and control method thereof
  • Grading bypass circuit for tower amplifier and control method thereof

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Embodiment Construction

[0034] Describe as follows in conjunction with accompanying drawing and embodiment:

[0035] see figure 2 , the present invention is used for the hierarchical bypass circuit of the tower top amplifier, including the pre-amplifier A1, the post-amplifier A2, three switches S1, S2, S3 and two branch connection lines P1, P2.

[0036] The pre-amplifier A1 is used as a low-noise amplifier, and the post-amplifier A2 is used as a booster amplifier. In a normal working state, both of them amplify the signal successively.

[0037] The switches S1, S2, and S3 in this embodiment are radio frequency single-pole double-throw switches, which are controlled by a certain integrated control logic to switch between different connection states. Each switch S1, S2 or S3 has One common terminal and two active terminals connected to the common terminal, therefore, the same switching switch has only one connection state at the same time. Those skilled in the art should know that the switching swit...

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PUM

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Abstract

The invention discloses a grading bypass circuit for a tower amplifier and a control method thereof; the circuit comprises a preamplifier, a post amplifier, three selector switches and two branch circuit connecting lines with lambda/2 length, each selector switch is provided with a common terminal and one of movable ends, which is connected with the common terminal, all the selector switches are controlled to carry out comprehensive switching by combining the working state of the preamplifier and the post amplifier, so as to lead the circuit to have a state I that a first selector switch, thepreamplifier, a second selector switch, the post amplifier and a third selector switch which are conducted sequentially; and a state II that the first selector switch, the preamplifier, a second branch circuit connecting line and a third selector switch which are conducted sequentially; and a state III that the first selector switch, a first branch circuit connecting line and the third selector switch which are conducted sequentially; the invention simplifies the structure of the grading bypass circuit, and the cost is reduced correspondingly; on the electrical performance, bypass loss and thewhole power consumption are further reduced.

Description

technical field [0001] The invention relates to a graded bypass circuit for a tower top amplifier and a control method thereof. Background technique [0002] The Tower Mounted Amplifier (TMA) is a new type of network optimization that reduces the receiving noise figure of the entire system, improves the receiving sensitivity of the entire system, and improves the receiving performance of the base station by adding a low-noise amplifier at the front end of the base station receiving system, that is, close to the receiving antenna. equipment. [0003] All tower mounted amplifiers have a bypass function, especially high gain tower amplifiers also have a graded bypass function. The common hierarchical bypass methods are as follows: figure 1 shown. The amplifier includes a pre-amplifier A1 and a post-amplifier A2. Two SPDT switches S1, S2, S3, and S4 are connected to both sides of the amplifiers A1 and A2 respectively, and the single-pole double-throw switches on both sides of...

Claims

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Application Information

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IPC IPC(8): H03F1/02H03F1/26H04B1/00
CPCH03F3/72
Inventor 陶沁
Owner COMBA TELECOM SYST CHINA LTD
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