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Amplifier linearity boost circuits and methods for post distortion feedback cancelation

An amplifier circuit, amplifier technology, applied in the direction of improving amplifiers to reduce nonlinear distortion, amplifiers, low-frequency amplifiers, etc., can solve problems such as channel interference and increase bandwidth

Pending Publication Date: 2020-01-14
SKYWORKS SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Intermodulation distortion usually occurs due to nonlinearities in the amplifier or preamplifier system
When uncontrolled, intermodulation distortion can increase bandwidth and create channel interference and various other undesirable effects

Method used

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  • Amplifier linearity boost circuits and methods for post distortion feedback cancelation
  • Amplifier linearity boost circuits and methods for post distortion feedback cancelation
  • Amplifier linearity boost circuits and methods for post distortion feedback cancelation

Examples

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Embodiment Construction

[0026]Aspects and examples described herein relate to electronic systems, and in particular to amplifier circuits for electronic systems and devices. In various examples, the described amplifier circuit includes an amplifier linearity boost circuit coupled along a feedback path between a signal input and a signal output of the amplifier. Amplifiers may include low noise amplifiers, power amplifiers, or any other radio frequency amplifiers that may be found in electronic devices. Based on the amplified signal at the signal output of the amplifier, the amplifier linearity boosting circuit is configured to apply a non-linear current to the signal input of the amplifier to reduce intermodulation distortion of the amplified signal.

[0027] As noted above, virtually all wireless device designs will experience some degree of intermodulation distortion. In order to reduce intermodulation distortion, usually an intermodulation distortion absorber is coupled to the output of the ampli...

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PUM

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Abstract

An amplifier circuit is provided that includes an amplifier having a signal input and a signal output, the amplifier being configured to produce an amplified signal at the signal output, a feedback path coupled between the signal output and the signal input, and an amplifier linearity boost circuit positioned in the feedback path. The amplifier linearity boost circuit includes a non-linear currentgenerator and a phase-shifting circuit, the non-linear current generator being configured to provide a non-linear current based on the amplified signal, and the phase-shifting circuit being configured to adjust a phase of the non-linear current to reduce an intermodulation distortion of the amplified signal.

Description

[0001] Cross References to Related Applications [0002] This application claims benefit under 35 U.S.C § 119(e) to U.S. Provisional Patent Application Serial No. 62 / 694,488, filed July 6, 2018, entitled "Amplifier Linearity Boosting Circuit and Method for Post-Distortion Feedback Cancellation" priority, the entire contents of which are hereby incorporated by reference for all purposes. Background technique [0003] Many wireless device designs, such as those used in smartphones and tablet computers, require amplification of the signal without significant distortion. While amplifier architectures have been designed to reduce distortion, virtually all wireless device designs experience some degree of intermodulation distortion. Intermodulation distortion is amplitude modulation involving two or more signals of different frequencies and is quantified by non-harmonic frequencies added to the input signal. Intermodulation distortion usually occurs due to nonlinearities in the am...

Claims

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Application Information

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IPC IPC(8): H03F1/32H03F1/34H03F1/56
CPCH03F1/3205H03F1/342H03F1/565H03F3/185H03G1/0088H03F1/3247H03F1/3276H03F1/3282H03F1/3294H03F1/0227H03F2201/3231H03F1/0205H03F1/32H03G3/30H03F3/193H03F3/21
Inventor J·J·E·M·哈格瑞茨J·李
Owner SKYWORKS SOLUTIONS INC
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