Patent
N-th order curve fit for power calibration in a mobile terminal
TLDR
In this article, a method for calibrating the output power of a mobile terminal using at least a second order curve fit to describe a power amplifier gain (PAG) setting versus output power characteristic of the power amplifier in a transmitter of the mobile terminal is provided.Abstract:
A method for calibrating the output power of a mobile terminal using at least a second order curve fit to describe a power amplifier gain (PAG) setting versus output power characteristic of a power amplifier in a transmitter of the mobile terminal is provided. For each of an upper-band frequency, a mid-band frequency, and a lower-band frequency of a frequency band, multiple measurements of the output power of the mobile terminal are made corresponding to multiple values of the PAG setting, and a curve fit is performed, thereby calculating coefficients defining a polynomial describing the PAG setting versus output power characteristic. Using the polynomials describing the PAG setting versus output power characteristic of the power amplifier for each of the upper-band, mid-band, and lower-band frequencies, values of the PAG setting are determined for each desired output power level for each desired frequency within the frequency band.read more
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Patent
Envelope power supply calibration of a multi-mode radio frequency power amplifier
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Patent
Group delay calibration method for power amplifier envelope tracking
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Patent
Apparatuses and methods for rate conversion and fractional delay calculation using a coefficient look up table
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Pseudo-envelope following power management system
Nadim Khlat,Michael R. Kay +1 more
TL;DR: In this article, a pseudo-envelope follower power management system was used to manage the power delivered to a linear RF power amplifier, which is used to control a linear power amplifier.
Patent
Power loop control based envelope tracking
TL;DR: In this article, the transceiver circuitry regulates a modulated power supply voltage, which is used by the radio frequency power amplifier to provide power for amplification, based on the difference between the target output power from the RFP amplifier and the measured output power of the RF power amplifier.
References
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Journal ArticleDOI
The CORDIC Trigonometric Computing Technique
TL;DR: The trigonometric algorithms used in this computer and the instrumentation of these algorithms are discussed in this paper.
Proceedings ArticleDOI
A survey of CORDIC algorithms for FPGA based computers
TL;DR: This paper attempts to survey commonly used functions that may be accomplished using a CORDIC architecture, explain how the algorithms work, and explore implementation specific to FPGAs.
Patent
Amplifying and processing apparatus for modulated carrier signals
Alan D. Sokal,Nathan O. Sokal +1 more
TL;DR: In this article, the amplitude and phase transfer functions of a power amplifying and signal processing system for modulated carrier signals are controlled by a nonlinear function generator which acts upon the signal fed by that path to the comparator.
Patent
Digital compensation for wideband modulation of a phase locked loop frequency synthesizer
TL;DR: In this paper, a digital compensation filtering technique is provided that enables indirect phase locked loop modulation with a digital modulation data stream having a bandwidth that exceeds, perhaps by an order of magnitude, the bandwidth characteristic of the phase-locked loop.
Patent
Amplifier measurement and modeling processes for use in generating predistortion parameters
Andrew S. Wright,Bartholomeus T. W. Klijsen,Paul V. Yee,Chun Yeung Kevin Hung,Steven J. Bennett +4 more
TL;DR: In this article, a wideband predistortion system consisting of a data structure in which each element stores a set of compensation parameters (preferably including FIR filter coefficients) for predistorting the wideband input transmission signal is proposed.