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Power amplifier with low noise figure and voltage variable gain

An amplifier and low-noise technology, applied to amplifiers with semiconductor devices/discharge tubes, amplifiers, improved amplifiers to reduce the harmful effects of internal resistance, etc., can solve problems such as performance not suitable for mobile communications, and achieve convenient gain adjustment, Effect of reduced surface area, reduced amount

Inactive Publication Date: 2015-08-12
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the performance achievable by this scheme is not suitable for the needs of the field of mobile communication infrastructure

Method used

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  • Power amplifier with low noise figure and voltage variable gain
  • Power amplifier with low noise figure and voltage variable gain
  • Power amplifier with low noise figure and voltage variable gain

Examples

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Embodiment Construction

[0028] figure 1The reception sequence of the base station is shown. The antenna receives the RF signal 100 for amplification. The cable connecting the antenna to the front-end transmitter / receiver 101 sends the signal 100 to a duplex filter 102 which makes it possible to perform a first filtering of the useful signal while severely attenuating signals outside the frequency reception range. The filtered signal 100 enters a receiver 103 which makes it possible to condition the filtered signal 100 from the duplex filter 102 before sending it to a demodulation circuit 104 comprising mixer and demodulator. The receiver 103 includes a first very low noise fixed gain amplifier 105 (called "LNA" (Low Noise Amplifier, low noise amplifier)), followed by a second very low noise variable gain amplifier 106 (called "VGA" (Variable Gain Amplifier, variable gain amplifier)) and the subsequent power divider 107. The power divider 107 enables the distribution of the amplified RF signal 10...

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Abstract

The object of the present invention is a low noise figure amplifier with a variable gain which comprises a cascode amplification stage comprising, serially mounted, a low-voltage MOSFET transistor installed as a common source followed by a bipolar transistor with high breakdown voltage installed as a common base. A resistor is placed between the bipolar transistor's collector and the grid of the cascode stage's MOSFET transistor, and the cascode stage is electrically powered through a choke.

Description

[0001] Cross References to Related Applications [0002] This application is based on French Patent Application No. 1052956 filed April 19, 2010, the entire disclosure of which is hereby incorporated by reference into this application, and the priority of which is hereby claimed under 35 U.S.C. §119. technical field [0003] The present invention relates to a power amplifier with low noise and voltage variable gain, which can be used over a wide frequency band (for example from 700 MHz to 2.6 GHz) for base stations of wireless mobile communication infrastructure. Background technique [0004] In radio frequency signal transmission / reception systems, in a known manner, the reception sequence includes an antenna for receiving the signal sent to an amplifier circuit of the receiver whose function is to filter and amplify the signal representing the transmitted information. The main role of the amplifier is to adjust the signal to the proper level for the demodulation circuit b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/22H03F3/195H03G1/00
CPCH03F1/223H03F3/195H03F1/22H03G1/0023H03G3/00H03G1/00
Inventor P·鲁Y·贝延斯M·戈恩
Owner ALCATEL LUCENT SAS
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