Filter with low-noise amplifier

A low-noise amplifier and filter technology, which is applied in the field of filters, can solve the problems of expensive isolators, hindering the low manufacturing cost of circuits, and deteriorating circuit noise coefficients.

Inactive Publication Date: 2004-05-12
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the above configuration, the isolator needs to meet impedance matching and noise figure matching
Since the isolator is inserted at the input of the LNA, the insertion loss of the isolator degrades the noise figure of the circuit
In addition, the isolator is very expensive, which prevents the low manufacturing cost of this circuit

Method used

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Embodiment Construction

[0033] Before describing the process of the present invention, it should be mentioned that like parts are designated by like numerals throughout the drawings.

[0034] Next, a filter K1 having a low noise amplifier according to a first embodiment of the present invention will be described with reference to the drawings. exist figure 1 Among them, the filter K1 includes an input terminal 101 , an output terminal 102 , first and second 3 dB hybrid circuits 103 and 104 , first and second amplifying circuits 105 and 106 and a filter 131 . The first amplifying circuit 105 is composed of an input matching circuit 107 , an amplifying element 108 and an output matching circuit 109 connected in series. Similarly, the second amplifying circuit 106 is composed of an input matching circuit 110 , an amplifying circuit 111 and an output matching circuit 112 connected in series. The first and second 3dB hybrid circuits 103 and 104 comprise as image 3 A first end 121 , a second end 122 , ...

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Abstract

A filter with a low-noise amplifier includes: two amplification circuits, a first 3-dB hybrid circuit which is connected to an input side of the amplification circuits, a second 3-dB hybrid circuit which is connected to an output side of the amplification circuits, and a filter which is connected to one input terminal of the first 3-dB hybrid circuit. The other input terminal of the first 3-dB hybrid circuit is subjected to matched termination. A signal is inputted to an input terminal of the filter and is outputted from one output terminal of the second 3-dB hybrid circuit and the other output terminal of the second 3-dB hybrid circuit is subjected to matched termination.

Description

technical field [0001] The present invention relates to a filter with a low noise amplifier mainly used in base stations of mobile communication systems such as car phones and portable phones. Background technique [0002] In recent years, due to the rapid development of mobile communication, the requirements for mobile communication base stations have also increased. For this reason, there is a strong demand for high performance and low cost for the low noise amplifier used here. As in a known example with an LNA, a LNA used in a duplexer of a base station needs to have low noise characteristics and therefore an input matching circuit is designed to have a minimum noise figure. On the other hand, such a low noise amplifier is usually used at its input for connection to an antenna duplexer. A filter in the antenna duplexer is designed to exhibit the desired characteristics in an impedance matched state. Therefore, in order to obtain this characteristic of the filter in an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/68H01P1/205H03F1/26H03F3/60
CPCH03F2200/372H01P1/2053H03F3/604
Inventor 松吉俊满橘稔人善积顺一坂仓真石崎俊雄上野伴希中村俊昭
Owner PANASONIC CORP
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