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Configurable feedback for an amplifier

A technology for amplifiers, feedback elements, applied in the field of noise figure and linearity of amplifiers

Inactive Publication Date: 2016-01-06
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The design goals of low noise figure and good linearity are often in conflict, and a single LNA design must often trade one for the other

Method used

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  • Configurable feedback for an amplifier
  • Configurable feedback for an amplifier
  • Configurable feedback for an amplifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] figure 1 Shows the general circuit topology of an LNA. exist figure 1 , the source voltage Vs is coupled to the gate (G) of transistor M1 via an input match. The drain (D) of transistor M1 is coupled to the output match and load. The circuit effectively provides gain to the input signal (Vs) via a gain element (transistor M1 ) to produce an output signal (drain voltage).

[0021] To improve the linearity of the LNA, the impedance Z FB The shunt feedback of is provided from the drain (D) to the gate (G). The feedback can be a series RC network or any other network. The feedback couples the output signal (drain voltage) to the input signal (Vs) to produce a modified input signal (gate voltage) for the gain element (transistor M1).

[0022] Note that while feedback generally improves the linearity of the LNA, feedback may also reduce gain and increase noise, thereby degrading the noise figure of the LNA. An aspect of the invention provides for configuring the amou...

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PUM

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Abstract

An amplifier is disclosed that includes configurable feedback based on the output of a received signal strength indicator. The feedback may be increased for high received signal levels, and decreased for low received signal levels. In an embodiment, the configurable impedance may comprise a plurality of discrete impedance settings. Amplitude and / or time hysteresis may be incorporated.

Description

[0001] Information about divisional applications [0002] This case is a divisional application. The parent case of this divisional case is an invention patent application with an application date of October 3, 2008, an application number of 200880110142.6, and an invention title of “Configurable Feedback for Amplifiers”. technical field [0003] The present invention relates to communication receivers and, more particularly, to techniques for improving the noise figure and linearity of amplifiers, such as low noise amplifiers. Background technique [0004] In a communication system, a transmitter modulates a signal onto a radio frequency (RF) carrier and transmits the signal to a receiver via a communication channel. At the receiver, a low noise amplifier (LNA) typically amplifies the received signal (which may contain the desired signal, noise, and undesired jammers) and provides the amplified signal to a subsequent receiver stage for deal with. LNAs are typically desi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/34H03F1/26H03F1/32H04B1/10
CPCH03F1/26H03F1/3205H03F1/342H03F2200/156H03F2200/294H03F2200/372H03F2200/78H03F2200/99H04B1/109H03F2200/393H03G1/0029H03G1/0088H03G3/3052
Inventor 马希姆·兰詹刘里
Owner QUALCOMM INC