Intel Mobile Communications Gmbh

Infineon Technologies Ag

Nick Shute

Andrea Camuffo

Jan-Erik Mueller

Sandro Pinarello

Chi-Tao Goe

Andrei Panioukov

Zdravko Boos

Thomas Mayer

Alexander Belitzer

Bernhard Sogl

Christian Mayer

Michael Wilhelm

Andreas Schwarz

Bernd Adler

Timo Gossmann

Peter Bundgaard

Günter Märzinger

Michael Meixner

Dirk Friedrich

Guenter Maerzinger

One embodiment relates to a feedback receiver (FBR). The FBR includes a FBR signal input configured to receive a radio frequency (RF) signal, a first local oscillator (LO) signal input configured to receive a first LO signal having an LO frequency, and a second LO signal input configured to receive a second LO signal having the LO frequency. The second LO signal is phase shifted by approximately 90&#xb0; relative to the first LO signal. FBR also includes a divider that induces a time-varying phase shift in the first and second LO signals while concurrently retaining a 90&#xb0; phase shift between the first and second LO signals.

FBR DC vector offset removal using LO phase switching

An apparatus for providing a linearity information associated with an amplifier includes an operating state determinator and an evaluator. The operating state determinator is configured to obtain information describing a gain of the amplifier for at least one bias condition of the amplifier. The evaluator is configured to obtain the linearity information based on both the information describing the gain of the amplifier and information about the at least one bias condition of the amplifier using a gain-bias characteristic of the amplifier. A bias circuit including the apparatus for providing the linearity information is also disclosed. A corresponding method for providing the linearity information includes: using the information describing the gain of the amplifier and the information about the at least one bias condition with the gain-bias characteristics to determine a relation of a current operating point described by the information with respect to the gain-bias characteristic; and deriving the linearity information from said relation.

Apparatus and method for providing amplifier linearity information

One embodiment of the present invention relates to a method and apparatus are provided herein for reducing the power consumption of a transmission chain while maintaining an acceptable figure of merit (e.g., linearity). In one embodiment, an adaptive biasing element is configured to perform adaptive biasing to reduce current consumption of a transmission chain by adjusting the operating point of one or more transmission chain elements (e.g., power amplifier, mixer, etc.). However, since adaptive biasing may reduce the linearity of a transmitted signal, its use is limited by the degradation of figure of merit caused by the introduced non-linearities. Accordingly, a pre-distortion element may be configured to perform adaptive digital pre-distortion (DPD) on a transmission chain input signal to account for non-linearities generated through the adaptive biasing, therefore allowing the adaptive biasing to further reduce the current consumption while maintaining an acceptable figure of merit.

Joint adaptive bias point adjustment and digital pre-distortion for power amplifier

This disclosure relates to a continuous open loop control to closed loop control transition.

Continuous open loop control to closed loop control transition

Systems and method for implementing a transmitter with hybrid closed loop power control in a communication device.

Transmitter with hybrid closed loop power control

This disclosure relates to linearization in polar modulators of wireless communication devices, to attain linear amplification and high power efficiency during transmission.

Polar feedback receiver for modulator

This disclosure relates to linearization in polar modulators of wireless communication devices and associated methods, to attain linear amplification and high power efficiency during transmission.

A feedback loop is used to determine phase distortion created in a signal by directly extracting the phase distortion information from a feedback signal using original frequency modulation information.

Digital phase feedback for determining phase distortion

A power control loop includes a low-frequency signal path and a high-frequency signal path with the delay compensation block. The delay compensation block is used to determine a correlation between an average reference level and an average measured power level. The result may control a delay line to compensate a time misalignment in the power control loop.

Power control loop, transmitter with the power control loop and method for controlling output power of a transmitter device

One embodiment of the present invention relates to a transmission circuit configured to dynamically adjust a number of active transistor cells within a power amplifier based upon a signal quality measurement determined from a feedback. The transmission circuit comprises a transmission chain having a power amplifier configured to provide an output signal. A feedback loop extends from the output of the power amplifier to a control circuit and is configured to provide measured information about output signal (e.g., phase, amplitude, etc.) to the control circuit. The control circuit utilizes the measured signal information to evaluate a measured signal quality of the output signal. The control circuit dynamically adjusts a number of active transistor cells within a power amplifier based upon a signal quality measurement until the power amplifier is optimized to operate at an operating point for low current and good transmission quality.

Adaptive adjustment of active area for power amplifier

A power control system includes a reference path filter used to suppress high frequencies in an input signal and generate a filtered envelope signal, a reference path amplifier to scale the filtered input signal based on a gain signal and generate a reference signal, a signal path amplifier to amplify an RF modulated signal and generate a signal path output signal scaled by a gain of an actuator signal, and a power detector to detect a power associated with the signal path output signal. The system includes an ADC to receive, pre-filter and convert the detected envelope signal into a measurement signal, and a comparator block to receive the reference signal and the measurement signal, and generate an error signal based on the difference, and a controller to generate the actuator signal for controlling the gain of the signal path amplifier based on the error signal.

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Munich, Germany

Nick Shute