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Wideband Envelope Tracking

An envelope tracking and bandwidth compression technology, applied in amplifiers with semiconductor devices/discharge tubes, pulse technology, pulse processing, etc., and can solve problems such as distortion or noise of amplified signals

Active Publication Date: 2020-07-14
ANALOG DEVICES INT UNLTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method can have disadvantages because the compression is a non-linear behavior and, as mentioned above, this non-linearity can lead to undesired distortion or noise in the amplified signal to be transmitted

Method used

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  • Wideband Envelope Tracking
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  • Wideband Envelope Tracking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1 is a technique, such as a method for power amplifier supply modulation, comprising: receiving discrete-time samples corresponding to a signal to be amplified by a power amplifier circuit after a specified delay, the samples defining a first bandwidth; identifying information representing a peak magnitude of the signal within a specified time window defining the sequence of discrete-time samples; using the information indicative of the peak magnitude to establish a value for a sample of the envelope tracking signal; filtering the envelope tracking signal to provide a bandwidth compressed envelope tracking signal defining a second bandwidth narrower than the first bandwidth; modulating a power supply node of the power amplifier circuit with an analog representation of the bandwidth compressed envelope tracking signal and aligning in time a signal to be amplified by the power amplifier circuit with the bandwidth compressed envelope tracking signal modulating th...

Embodiment 10

[0060]Embodiment 10 is an electronic circuit comprising: a tapped delay line configured to store discrete-time samples corresponding to a signal to be amplified by a power amplifier circuit after a specified delay, the samples defining a first bandwidth; and a bandwidth-compressed envelope tracking circuit configured to: receive discrete-time samples from said tapped delay line; identify information representing peak magnitudes within a specified time window defining said sequence of discrete-time samples, said a time window is defined by a prescribed delay established by said tapped delay line; using information indicative of said peak magnitude to establish values ​​for discrete time samples of an envelope tracking signal; and filtering said envelope tracking signal to provide a bandwidth compressed envelope tracking signal defining a second bandwidth narrower than said first bandwidth, said bandwidth compressed envelope tracking signal being provided at the output of said ba...

Embodiment 17

[0067] Embodiment 17 is an electronic circuit comprising: a tapped delay line configured to store discrete-time samples corresponding to a signal to be amplified by a power amplifier circuit after a specified delay, the samples defining a first bandwidth; comprising A network tracking circuit configured to: receive discrete-time samples from the tapped delay line; identify information representative of peak magnitudes within a specified time window defining the sequence of discrete-time samples, the time window defined by the defined by a specified delay established by the tapped delay line; using information indicative of the peak magnitude to establish a value of a discrete-time sample of an envelope tracking signal; and an envelope tracking driver circuit configured to use the an analog representation of a bandwidth compressed envelope tracking signal to modulate the power supply node of the power amplifier, the analog representation obtained at least in part by filtering th...

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Abstract

An envelope tracking scheme can be used, such as to modulate a supply node of a power amplifier circuit to improve efficiency. For example, a magnitude or amplitude envelope of a signal to be modulated can be scaled and used to drive a node, such as a drain, of the power amplifier circuit. An envelope tracking signal can be generated such as having a bandwidth that is compressed as compared to a full-bandwidth envelope signal. A peak-value "look ahead" technique can be used, for example, so that amplitude compression or clipping of the transmit signal is suppressed when the bandwidth-compressed envelope tracking signal is used to modulate a supply node of the power amplifier used to amplify the transmit signal.

Description

[0001] priority claim [0002] This patent application claims the benefit of priority to U.S. Provisional Patent Application Serial No. 62 / 255,328 (Attorney Docket No. 13641 / 550400), filed November 13, 2015, by Pratt et al., entitled "BROADBAND ENVELOPETRACKING" , which application is incorporated herein by reference in its entirety. technical field [0003] This document relates generally, but not by way of limitation, to the modulation of power supplied to a power amplifier circuit to facilitate tracking by the power supply of the envelope of a signal to be amplified by the power amplifier circuit, eg, to enhance the operating efficiency of the power amplifier circuit. Background technique [0004] Power amplifiers are commonly used to amplify signals for transmission in communication systems. This transmission can occur wirelessly between the transmitter and one or more receivers, or the output of the power amplifier can be coupled with a cable or transmission line to ro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/02H03F1/32
CPCH03F1/02H03F1/32H03F1/0222H03F1/3247H03F3/19H03F3/245H03F2200/102H03F2200/36H03F2200/411H03F2200/504H03K5/15046H04B1/0475H03F3/21H03F2200/165H03F2200/336H03F2200/451
Inventor P·帕拉特J·B·布兰农R·D·特纳
Owner ANALOG DEVICES INT UNLTD