Patent
Integrated transceiver with envelope tracking
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TLDR
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.Abstract:
A transceiver comprises an amplifying circuit for amplifying an input signal to produce an output signal A power supply is operable for varying the level of power supplied to the amplifying circuit in response to variation of an input signal envelope directed to the power supply A processing circuit is operable for digitally detecting the input signal envelope to provide variation of the power supply level The processing circuit is further operable for digitally delaying the digital input signal envelope to time align the power supply level with the input signalread more
Citations
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Patent
Envelope power supply calibration of a multi-mode radio frequency power amplifier
TL;DR: In this paper, an envelope power supply calibration of a multi-mode RF power amplifier (PA) was proposed to ensure adequate headroom when operating using one of multiple communications modes. But, the power supply was not restricted to provide a minimum allowable magnitude based on an RF signal level of the PA.
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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.
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References
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Patent
Multi-mode amplifier system
Ian Stuart Robinson,Frank Winter +1 more
TL;DR: In this article, an amplifier system switches between modes of operation based upon a characteristic of an input signal relative to a first threshold level and a second threshold level, and a mode selector selects the operation mode by transmitting an amplitude modulated signal plus a variable headroom voltage to a supply terminal of a power amplifier during the envelope tracking mode, an amplitude and phase modulated input signal during the polar mode and a substantially constant amplitude signal to the supply terminal during the linear mode.
Patent
Linearized power amplifier
Michael Faulkner,M.A. Briffa +1 more
TL;DR: In this paper, a linearized power amplifier is provided which comprises a non-linear radio frequency (RF) power amplifier, a linearization circuit such as a Cartesian Feedback circuit, an RF feedback circuit; an IF feedback circuit, or a feedforward circuit, and a dynamic bias modulation circuit for modulating an operating voltage of the amplifier.
Patent
Method, device, phone and base station for providing envelope-following for variable envelope radio frequency signals
Pallab Midya,Lawrence E. Connell,Steven F. Gillig,John Grosspietsch,Andrew Merritt Khan,George Francis Opas,Robert Louis Palandech +6 more
TL;DR: In this paper, an envelope-following unit is used to output a supply voltage in accordance with a variable envelope of an input baseband signal, wherein using the efficient envelope following unit includes: 1) using a bandwidth-limiting mapping unit to determine a reference signal based on the base band signal; and 2) using an envelope tracking power converter to output the supply voltage, responsive to the reference signal, to the linear RF power amplifier.
Proceedings ArticleDOI
Envelope tracking power amplifier with pre-distortion linearization for WLAN 802.11g
TL;DR: A high-efficiency wide-bandwidth envelope amplifier and a GaAs MESFET class AB RFPA are designed and implemented for the WLAN 802.11g system to improve the linearity and overall system drain efficiency.
Patent
Variable output power supply
TL;DR: A variable output power supply for use in a highly efficient linear amplification system includes an envelope detector having at least one input for receiving an input signal to be amplified as mentioned in this paper, which generates, as an output, a control signal that is representative of an envelope of the input signal.