Eta Devices, Inc.

Talkingheads Wireless, Inc.

Ela Devices, Inc.

Mark A Briffa

Joel L Dawson

David J Perreault

Oguzhan Uyar

Krenar Komoni

John Edward DeRoo

Yevgeniy A Tkachenko

John Hoversten

Mattias Astrom

Per-Ludvig B Normark

John E Deroo

Described are concepts, systems and techniques for dividing a communication channel such that no single radio frequency (RF) power amplifier (PA) in a remote radio head (RRH) operates over an excessively wide frequency bandwidth. This allows efficient operation of the RF PA wherein each PA transmit path is tuned for operation at a respective one of a plurality of different center frequencies (f, f+Δf, . . . f+(n−1)Δf where n is an integer corresponding to the number of RF PA transmit paths.

Cellular network that dynamically adjusts bandwidth and number of MIMO paths based on realized channel capacity

Described are concepts, systems and techniques for detecting whether an impedance mismatch exists at an output port of a remote radio head (RRH) or at an output port of a radio frequency (RF) amplifier in an RRH such as may be caused by a faulty connection between an antenna and a transmit signal path of the RRH. Also described are means for protecting an RF amplifier or other active RF device in the transmit signal path from damage due to such a faulty connection.

Sensing of antenna connection for remote radio heads

Described are concepts, systems and techniques for detecting whether an antenna is connected to a transmit system to thereby protect a power amplifier lineup from damage.

Systems and related techniques for efficient operation of a cellular network

Circuits and methods for achieving high linearity, high efficiency power amplifiers, including digital predistortion (DPD) and pulse cancellation in switched-state RF power amplifier systems are described.

Linearization circuits and methods for multilevel power amplifier systems

A radio frequency (RF) power amplifier system or transmitter includes one or more power amplifiers and a controller that is configured to adjust amplitudes and phases of RF input signals of the one or more power amplifiers and supply voltages applied to the one or more power amplifiers. In embodiments where multiple power amplifiers are used, a combiner may be provided to combine outputs of the power amplifiers.

RF amplifier having a transition shaping filter

A radio frequency (RF) transmit system includes an observation receiver coupled to receive a portion of an RF signal propagating along an RF transmit signal path and a digital pre-distortion (DPD) system coupled to the observation receiver and configured to receive one or more signals from the observation receiver and in response thereto, to adapt one or more DPD values of the RF transmit system over a period of time and a range of operating conditions of the RF transmit system and to provide one or more adapted DPD values to said controller.

Digital pre-distortion (DPD) training and calibration system and related techniques

A radio frequency (RF) amplification system or transmitter includes one or more power amplifiers and a controller that is configured to adjust amplitudes and phases of RF input signals of the one or more power amplifiers and supply voltages applied to the one or more power amplifiers. The system may include a single digital-to-RF modulator and a power divider to drive multiple power amplifiers. A power combiner may also be provided to combine outputs of the power amplifiers. In at least one implementation, amplitude adjustment of the RF input signals of the one or more power amplifiers may be used to provide transmit power control and/or power backoff.

Asymmetric multilevel backoff amplifier with radio-frequency splitter

RF amplifier having discrete supply voltages

Circuits and methods for performing multilevel power amplification using multiple different supply voltages or states are disclosed. In some embodiments, power amplifiers are provided that switch between three or more supply voltages or states.

Method and apparatus for multilevel power amplification

A radio frequency (RF) transmitter includes one or more power amplifiers and a controller that is configured to adjust amplitudes and phases of RF input signals of the one or more power amplifiers and supply voltages applied to the one or more power amplifiers. In embodiments where multiple power amplifiers are used, a combiner may be provided to combine outputs of the power amplifiers. In at least one implementation, amplitude adjustment of the RF input signals of the one or more power amplifiers may be used to provide transmit power control and/or power backoff for the RF transmitter.

Growing community of inventors

Tyreso, Sweden

Mark A Briffa