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Wideband low noise amplifier

A low-noise amplifier, wide-band low-noise technology, applied to improve amplifiers to reduce noise impact, electrical components, transmission systems, etc., can solve the problems of poor gain and noise performance, high power consumption, etc., to save design and optimize noise performance, the effect of DC operating point stability

Inactive Publication Date: 2010-03-24
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

But its gain and noise performance is not good
It can be overcome by increasing the feedback resistor, but it also brings the problem of high power consumption

Method used

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  • Wideband low noise amplifier
  • Wideband low noise amplifier

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] see figure 1 , figure 1 It is a block diagram of the broadband low noise amplifier of the present invention. The broadband low noise amplifier of the present invention comprises differential amplifier unit 10, output unit 20, feedback unit 30; Wherein: the positive radio frequency signal input terminal A1 of differential amplifier unit 10 is used for inputting positive radio frequency signal V IN+ The first feedback output terminal C3 of the feedback unit 30 is connected in parallel, and the negative radio frequency signal input terminal A2 of the differential amplifier unit 10 is used to input the negative radio frequency signal V IN- The second feedback output terminal C4 of the feedback unit 30 is connected in parallel; the first positive output terminal B3 of the output unit 20 is used to output a positive signal V OUT+ ...

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Abstract

Disclosed is a broadband low-noise amplifier which is a low noise amplifier used to amplify broadband radio frequency signals and a broadband input matching design method. The low noise amplifier comprises a differential amplifier unit(10), an output unit(20), a feedback unit(30). The amplifier adopts a differential structure and employs a parallel-parallel negative feedback structure to realize input impedance matching within the broadband so as to optimize the noise performance of the circuit, and meanwhile, the feedback circuit provides DC offset to an input transistor, thus combining the functions of feeding back the alternating current and providing DC offset, making a DC operating point more stable.

Description

technical field [0001] The invention relates to a broadband low noise amplifier in a radio frequency receiver, in particular to a negative feedback broadband matching method. Background technique [0002] In the radio frequency receiver of the wireless communication system, after the radio frequency signal is received by the antenna, passes through the frequency band gating filter, and then enters the radio frequency receiver chip. In the RF receiver chip, the low-noise amplifier is generally located at the forefront of the receiver to achieve good input impedance matching, while providing moderate gain to amplify the RF signal, and suppressing the contribution of the subsequent circuit modules to the overall system noise. The low-noise amplifier must achieve good impedance matching with the off-chip filter. Ideally, a 50Ω pure resistance is provided to avoid or reduce power loss during signal transmission. Therefore, input impedance matching is an item of the low-noise ampl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/26H04B1/10
Inventor 吴建辉束然李景峰丁国华张萌李红时龙兴
Owner SOUTHEAST UNIV
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