Patent
Systems and methods utilizing adaptive envelope tracking
TLDR
In this paper, a communication system utilizing adaptive envelope tracking includes a transmit path, a feedback receiver, a parameter component and an envelope tracking component, where the parameter component is configured to generate linearity parameters from the feedback signal and the baseband signal.Abstract:
A communication system utilizing adaptive envelope tracking includes a transmit path, a feedback receiver, a parameter component and an envelope tracking component. The transmit path is configured to generate a transmit signal. The feedback receiver is configured to generate a feedback signal from the transmit signal. The parameter component is configured to generate linearity parameters from the feedback signal and the baseband signal. The envelope tracking component is configured to generate a supply control signal having time delay adjustments.read more
Citations
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Patent
Multi-mode envelope tracking amplifier circuit
TL;DR: In this article, a multi-mode envelope tracking (ET) amplifier circuit is presented, which can operate in a low-resource block (RB) mode, a mid-RB mode, and a high RB mode.
Patent
Reduced bandwidth envelope tracking
TL;DR: In this article, an envelope power converter control signal is provided such that the envelope power supply signal causes the gain of the amplifier to remain substantially constant over a range of input power provided to the amplifier.
Patent
Digital predistortion system and method based on envelope tracking and radio frequency system
TL;DR: In this paper, a digital predistortion system and method based on envelope tracking, and a radio frequency system, is presented, where the system includes: a predistorter, a digital-to-analog converter, a frequency mixer, a power amplifier and a power supply apparatus.
Patent
Envelope tracking with reduced dynamic range
TL;DR: In this article, the power converter circuitry is configured to receive an envelope power converter control signal and a supply voltage, and then the envelope power supply signal for an amplifier from the supply voltage and based on the envelope Power Converter Control signal.
Patent
Envelope tracking amplifier circuit
TL;DR: In this article, an envelope tracking (ET) amplifier circuit is described, which includes ET tracker circuitry configured to provide an ET modulated voltage to an amplifier circuit for amplifying a radio frequency (RF) signal.
References
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Patent
Integrated transceiver with envelope tracking
TL;DR: A transceiver comprises an amplifying circuit for amplifying an input signal to produce an output signal, and a power supply is operable for varying the level of power supplied to the Amplifying circuit in response to a variation of the input signal envelope directed to the power supply as discussed by the authors.
Patent
Method for tuning an envelope tracking amplification system
TL;DR: In this article, the optimal operating point of an envelope tracking amplification system (100) that includes a radio frequency (RF) power amplifier (110) having an RF amplifying element (114) was determined based on an application to the RF power amplifier of a supply voltage (211) that is less than the rated voltage of the RF amplifier element.
Patent
Group delay calibration method for power amplifier envelope tracking
Nadim Khlat,Karl F. Horlander +1 more
TL;DR: In this article, an open loop envelope tracking system calibration technique and circuitry is proposed, where an envelope tracker power converter generates a modulated power amplifier supply voltage for the radio frequency power amplifier based on a control signal derived from the modulated signal.
Patent
Envelope tracking power amplifier system with delay calibration
TL;DR: In this paper, a delay mismatch is estimated based on a difference between the first and second delays of the input and output signals captured during static operation of the power supply and a second delay is determined based on portions of the inputs and outputs captured during dynamic operation.
Patent
Transmit circuit, method for adjusting a bias of a power amplifier and method for adapting the provision of a bias information
TL;DR: In this article, an envelope tracker is configured to determine an envelope of a transmit signal and provide bias information based on the determined envelope of the transmit signal, and an impedance determinator is used to determine a measure of the load impedance of a load coupled to an output of the power amplifier.