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Biasing circuit suitable for low noise amplifier

A low-noise amplifier and bias circuit technology, applied in the direction of improving amplifiers to reduce temperature/power supply voltage changes, improving amplifiers to reduce noise effects, etc., can solve the problem of reducing product manufacturing costs and effectively reducing the size of radio frequency power amplifier integrated circuit chips Area and other issues, to achieve the effect of reducing complexity, reducing chip area and cost

Active Publication Date: 2013-04-10
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] The technical problem to be solved by the present invention is to provide a bias circuit suitable for low-noise amplifiers and a mobile terminal using it, so as to solve the existing problems that the chip area of ​​the radio frequency power amplifier integrated circuit cannot be effectively reduced and the production cost of the product can be reduced.

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  • Biasing circuit suitable for low noise amplifier
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  • Biasing circuit suitable for low noise amplifier

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Embodiment Construction

[0068] Certain terms are used, for example, in the description and claims to refer to particular components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. As mentioned throughout the specification and claims, "comprising" is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect. In addition, the term "coupled" herein includes any direct and indirect electrical coupling means. Therefore, if it is described that a first device is coupled to a second device, it means that the first device may be directly elect...

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Abstract

The invention discloses a biasing circuit suitable for a low noise amplifier. The biasing circuit is connected with a common source NMOS (N-channel metal oxide semiconductor) pipe in the low noise amplifier and two pins externally connected with a grid electrode on a common gate NMOS pipe. The biasing circuit is characterized by being formed by connecting and combining 1-12 MOS (metal oxide semiconductor) pipes (401-406, 410-415), 1-8 resistors (416-423) and 1-3 diodes (407-409). The biasing circuit suitable for the low noise amplifier has an enabling control function and can provide two modes of output bias, wherein in the first mode, the bias is provided in a working mode of the low noise amplifier, temperature compensation and voltage compensation of superwide range are realized, namely the condition that noise coefficients and gains of the low noise amplifier do not fluctuate along with the temperature and power voltage; and in the second mode, the other bias is provided in an idle mode of the low noise amplifier, reliability compensation is realized, so that the condition that a transistor is broken down is prevented. With the adoption of the biasing circuit suitable for the low noise amplifier, the complexity of the circuit can be greatly reduced, and the chip area and cost are reduced.

Description

technical field [0001] The invention relates to the field of analog circuits, in particular to a bias circuit suitable for low noise amplifiers. Background technique [0002] In the prior art, a low noise amplifier (LNA, Low Noise Amplifier) ​​is a key component in a radio frequency receiver. It is located at the front end of the receiver, and its performance such as noise figure and gain directly affects the sensitivity of the receiver. [0003] The performance of LNA is greatly affected by the working environment, which mainly refers to two aspects: [0004] The first is the change of ambient temperature. The RF system generally works at an ambient temperature of -40°C~80°C. As the temperature rises, the thermal noise increases, and the noise figure of the LNA will also deteriorate significantly; [0005] The second is the fluctuation of the power supply voltage. In general, as the power supply voltage drops, the supply current decreases, the gain will decrease, and the n...

Claims

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Application Information

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IPC IPC(8): H03F1/26H03F1/30
Inventor 黄清华陈高鹏路宁刘磊赵冬末
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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