Patent
Dual-input envelope tracking integrated circuit and related apparatus
TLDR
In this article, a dual-input envelope tracking (ET) integrated circuit (ETIC) and related apparatus are provided, which includes an ET voltage circuit configured to generate ET voltage and a first set of parameters.Citations
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Patent
Envelope tracking integrated circuit and related apparatus
TL;DR: In this article, an envelope tracking (ET) integrated circuit (IC) is provided, which is configured to generate an ET voltage based on a supply voltage and provide the ET voltage to an amplifier circuit for amplifying a radio frequency (RF) signal(s).
Patent
Group delay optimization circuit and related apparatus
TL;DR: In this paper, a group delay optimization circuit is proposed to minimize the group delay offset by reducing the statistical indicator to below a defined threshold in one or more group delay optimisation cycles.
Patent
Adaptive frequency equalizer for wide modulation bandwidth envelope tracking
TL;DR: In this article, an adaptive frequency equalizer for wide modulation bandwidth envelope tracking (ET) was proposed, which works to adaptively correct for such voltage errors to provide improved overall power signal tracking at the PA, especially where there is a large trace inductance from the ETIC being located several centimeters (cm) away from the PA.
Patent
Multi-bandwidth envelope tracking integrated circuit and related apparatus
TL;DR: In this article, a multi-bandwidth envelope tracking (ET) integrated circuit (IC) and related apparatus are provided, in which the ET voltages are generated based on the modulation bandwidth of the RF signal.
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
Apparatus and methods for envelope tracking
Florinel G. Balteanu,Sabah Khesbak,Yevgeniy A. Tkachenko,David Steven Ripley,Robert John Thompson +4 more
TL;DR: In this paper, a power amplifier system including an envelope tracker is presented, where the power amplifier is configured to amplify a radio frequency (RF) signal, and the envelope tracker includes a buck converter for generating a buck voltage from a battery voltage and a digital-to-analog conversion (DAC) module for adjusting the buck voltage based on the envelope of the RF signal.
Patent
High-efficiency envelope tracking systems and methods for radio frequency power amplifiers
TL;DR: In this article, an envelope tracking (ET) method for controlling the delivery of power to radio frequency power amplifiers (RFPAs) is described. But the system is not suitable for the use of a power amplifier.
Patent
Charge pump circuit
TL;DR: In this paper, an improved charge pump circuit includes one switch element driven by a ramp waveform to precisely control the output voltage and the average resistance of the switch group varies when the voltage of the power source varies, so that an output with a fixed voltage and low ripple voltage can be obtained.
Patent
Integrated circuit wireless communication unit and method for providing a power supply
TL;DR: In this article, an integrated circuit for providing a power supply to a radio frequency (RF) power amplifier (PA) is described, which includes a low-frequency power supply path including a switching regulator and a high-frequency Power Supply path arranged to regulate an output voltage of a combined power supply at an output port of the integrated circuit.