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US Patent 8981847 Apparatus and methods for envelope tracking

Patent 8981847 was granted and assigned to Skyworks Solutions, Inc. on March, 2015 by the United States Patent and Trademark Office.

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Patent abstractTimelineTable: Further ResourcesReferences
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Patent
Patent
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Patent attributes

Patent Applicant
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Current Assignee
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Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
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Patent Number
89818471
Patent Inventor Names
Florinel G Balteanu1
Date of Patent
March 17, 2015
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Patent Application Number
137633801
Date Filed
February 8, 2013
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Patent Citations Received
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US Patent 12126307 Power amplifier modules with controllable envelope tracking noise filters
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US Patent 11973468 Apparatus and methods for envelope tracking
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US Patent 11996806 Multi-level envelope tracking systems with separate DC and AC paths
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US Patent 12068765 Envelope controlled radio frequency switches
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US Patent 11677357 Envelope tracking system with modeling of a power amplifier supply voltage filter
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US Patent 11677368 Power amplifiers with adaptive bias for envelope tracking applications
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US Patent 11683013 Power amplifier bias modulation for low bandwidth envelope tracking
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Patent Primary Examiner
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Henry Choe
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Patent abstract

Apparatus and methods for envelope tracking are disclosed herein. In certain implementations, an envelope tracking system for generating a power amplifier supply voltage for a power amplifier is provided. The envelope tracking system can include a buck converter and an error amplifier configured to operate in parallel to control the voltage level of the power amplifier supply voltage based on an envelope of an RF signal amplified by the power amplifier. The buck converter can convert a battery voltage into a buck voltage that is based on an error current, and the error amplifier can generate the power amplifier supply voltage by adjusting the magnitude of the buck voltage using an output current that is based on the RF input signal's envelope. The error amplifier can control the buck converter by changing a magnitude of the error current in relation to a magnitude of the output current.

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