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Low noise amplifying circuit and radio frequency receiving front end circuit

A low-noise amplification and circuit technology, applied in low-noise amplifiers, amplifiers, high-frequency amplifiers, etc., to reduce noise figure, ensure performance, and improve gain.

Inactive Publication Date: 2018-11-02
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is how to improve the gain and noise performance of the low noise amplifier circuit in the carrier aggregation mode

Method used

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  • Low noise amplifying circuit and radio frequency receiving front end circuit
  • Low noise amplifying circuit and radio frequency receiving front end circuit
  • Low noise amplifying circuit and radio frequency receiving front end circuit

Examples

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Embodiment Construction

[0030] As mentioned in the background art, figure 1 When the circuit structure shown works in CA12 or CA21 mode (that is, in-band non-continuous carrier aggregation) mode, compared with CA1 / CA2 (that is, in-band continuous and out-band non-continuous carrier aggregation) working mode, its gain and noise performance deteriorates severely.

[0031] The inventor of the present application has carried out following analysis for the low-noise amplifier circuit in the prior art: Continue to refer to figure 1 , when the low noise amplifier circuit is in the in-band discontinuous carrier aggregation mode, the equivalent circuit of the low noise amplifier circuit at this time is as follows figure 2 shown. At this time, when the degenerated inductance Ls is equivalent to single-ended from the common-mode position, the inductance value changes to 2L s , so the equivalent conductance Gm2 of the single-ended low-noise amplifier circuit is: Among them, g m Conductance of MOS tube, 2L...

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Abstract

The invention provides a low noise amplifying circuit and a radio frequency receiving front end circuit. The low noise amplifying circuit comprises: a first amplifying component, wherein a first inputend of which accesses a radio frequency input signal and amplifies the same; a second amplifying component, wherein the first input end of which accesses a radio frequency input signal and amplifiesthe same; a first selection circuit, wherein an output end of the first amplifying component is connected with a first load end or a second load end through the first selection circuit; a second selection circuit, wherein the output end of the second amplifying component is connected with the first load end or the second load end through the second selection circuit; an inductor, wherein one end of which is coupled to second input ends of the first amplifying component and the second amplifying component, and the other end of which is grounded; and an inductor adjusting circuit coupled to theinductor and suitable for adjusting the inductance value of the inductor. By adoption of the technical scheme of the invention, the gain and the noise performance of the low noise amplifying circuit in a carrier aggregation working mode can be improved.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a low-noise amplifier circuit and a radio frequency receiving front-end circuit. Background technique [0002] In order to meet the requirements of user peak rate and system capacity improvement, communication terminals adopt carrier aggregation (CarrierAggregation, CA) technology to increase system transmission bandwidth, such as the long-term evolution technology upgrade (LTE-Advanced) system. Existing RF front-end circuits generally use a Low Noise Amplifier (LNA) to amplify the signal to suppress the noise contribution of the subsequent circuit, and contribute less noise; the LNA structure with a degeneration inductor (Degeneration Inductor) can simultaneously achieve noise matching and gain matching, so low noise amplifiers generally adopt this structure. [0003] In order to realize the carrier aggregation function, taking dual-carrier as an example, the signal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/26H03F1/56H03F3/19
CPCH03F1/26H03F1/56H03F3/19H03F2200/294H03F2200/372H03F2200/451
Inventor 昌浩郭舒生陈作添赖玠玮
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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