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A two-stage differential low-noise amplifier

A low-noise amplifier and amplifier technology, applied in the field of communication, can solve the problems such as the deterioration of the sensitivity and dynamic range of the receiving front end, and achieve the effect of increasing the sensitivity and dynamic range, satisfying the input matching and high gain.

Active Publication Date: 2018-08-03
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially the second-order and third-order harmonic distortion will seriously deteriorate the sensitivity and dynamic range of the receiving front end

Method used

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  • A two-stage differential low-noise amplifier
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Embodiment Construction

[0029] The two-stage differential low noise amplifier of the present invention will be further described in detail below with reference to the accompanying drawings of the present invention.

[0030] Refer to attached figure 1 , the first amplifier uses the resistor RF1 to complete the feedback, and the second amplifier uses the resistor RF2 to complete the feedback, respectively completing the input matching of RF+ and RF-.

[0031] Use cross-coupled transistors MN5, MN6. The gate, source, and drain of MN5 are connected to the drain of MN2, the drain of MN1, and the drain of MP1 respectively to increase the equivalent transconductance of the first amplifier; the gate, source, and drain of MN6 are respectively connected to The drain of MN1, the drain of MN2 and the drain of MP2 are connected to increase the equivalent transconductance of the second amplifier. In this way, a higher transconductance can be achieved under the condition of reducing the operating current to meet ...

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Abstract

The invention provides a two-stage differential and low-noise amplifier. On the premise that gain and matching are satisfied, the two-stage differential and low-noise amplifier simultaneously has a low noise coefficient and high linearity. In a first-stage differential amplifier, a first CS amplifier and a second CS amplifier are connected through a cross coupled type transistor structure; the first CS amplifier and the second CS amplifier are used as the differential input stages; the first CS amplifier in the first-stage differential amplifier is coupled to a third CS amplifier in a second-stage differential amplifier through a capacitor; the second CS amplifier in the first-stage differential amplifier is coupled to a fourth CS amplifier in the second-stage differential amplifier through a capacitor; therefore, signals are superposed before a buffer stage; noise and a third-order intercept item are offset before the buffer stage; and a buffer is connected with the output end of the second-stage differential amplifier and used as output matching.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a low noise amplifier which can be used in a radio frequency receiver. Background technique [0002] Cellular communication systems are rapidly evolving towards increased data rates and traffic volumes, with a corresponding increase in the number of radio frequency bandwidths and standards supporting cellular communication. To accommodate the complexity of such communications, various antenna technologies are employed in order to achieve increased data rates through multiple-input multiple-output (MIMO). If the traditional narrowband reception is used, several parallel reception front ends are required to be used together, resulting in an increase in chip area and external devices around the chip. As a result, traditional narrowband reception gradually loses its appeal. Therefore, it is necessary to find other receiver structures that provide wide-band operating range, hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/26H03F3/45H03F3/26
CPCH03F1/26H03F3/265H03F3/45636
Inventor 李振荣庄奕琪郝张伟张超越
Owner XIDIAN UNIV