Aviacomm Inc.

Dialog Semiconductor Gmbh

Tao Li

Shih Hsiung Mo

Hans Wang

Binglei Zhang

Pengju Kong

Jianming Yao

David H Nguyen

Hien Huu Bui

Kai-Wen Chin

Juyoung Yoon

Wenbo Liang

Hanguang Zhang

Yimin Chen

Guang Feng

Mengfei Liu

Qingqing Zong

Yong Xiong Lin

Jiaji Qi

Zhi Yang

A flyback converter is provided that detects a load-transient-produced increase in the output current to more quickly detect and respond to the load transient.

Flyback converter with fast load transient detection

A flyback converter includes a synchronous rectifier switch transistor controlled by a controller. The controller cycles the synchronous rectifier switch transistor to lower an output voltage by transferring energy from a secondary-side output capacitor to a primary-side input capacitor.

Non-dissipative output voltage transition for an isolated switching power converter

A secondary-side control loop for a flyback converter is provided that generates a secondary-side control signal during normal operation using a compensator. In periods of significant load changes, the compensator is bypassed so that the secondary-side control signal is generated as an open-loop signal.

Flyback converter with improved dynamic load response

A flyback converter is disclosed having a secondary side controller that generates an input current for an optocoupler diode by driving a variable resistor with a control voltage. The secondary side controller varies a variable resistance for the variable resistor to compensate for current transfer ratio gain variations for the optocoupler.

Optocoupler current transfer ratio compensation

A synchronous rectifier controller method is provided for controlling the on and off periods of a synchronous rectifier (SR) switch transistor in a switching power converter. The method includes a first step of monitoring an unfiltered to control whether the SR switch transistor is turned on during a first part of a power switch cycle. The method also includes a second step of monitoring a filtered SR switch signal to control whether the SR switch is turned on during a remaining second part of the power switch cycle.

Adaptive synchronous rectifier sensing deglitch

An output current calibration is disclosed to increase the accuracy and precision of the constant-current mode for a flyback converter.

Flyback converter with output current calibration

An output voltage calibration circuit and technique is disclosed to increase the accuracy and precision of the constant-voltage mode for a flyback converter.

Flyback converter with output voltage calibration

A synchronous rectifier controller for controlling the on and off periods of a synchronous rectifier switch transistor in a switching power converter. In particular, the synchronous rectifier controller is configured to adaptively enable and disable a deglitch filter for filtering a turn-on signal for the synchronous rectifier switch transistor. In this fashion, the synchronous rectifier switch transistor may be switched on more rapidly during periods when the deglitch filter is disabled for greater efficiency yet the switching power converter is protected by the deglitch filter when it is not disabled.

One embodiment of the present invention provides a system for dynamic, on-demand, cross-channel bandwidth provisioning in a wireless communication system. During operation, the system determines, by a scheduler, bandwidth resources that are available in the wireless communication system. The available bandwidth resources comprise a plurality of scattered spectrum pieces. The system defines one or more logical channels that encompass the scattered spectrum pieces, aggregates multiple logical channels in response to determining that spectrum pieces encompassed by a single logical channel do not meet traffic need, and provisions a user or a service using spectrum pieces located within the aggregated multiple logical channels, thereby facilitating on-demand, cross-channel bandwidth provisioning.

Method and system for dynamic on-demand cross-channel bandwidth provisioning

One embodiment of the present invention provides a wireless transceiver. The transceiver includes a plurality of receiving paths, a plurality of transmitting paths, a number of RF components, and a configurable multiplexer for coupling one or more RF components to the transmitting paths and the receiving paths. The multiplexer is configured in such a way as to allow a particular RF component to couple to a subset of the receiving paths and/or a subset of the transmitting paths, thereby enabling flexible provisioning of the RF components.

RF transceiver architecture for flexible configuration of RF resources

One embodiment of the present invention provides a signal-recording system. During operation, the system receives a wideband multi-channel radio frequency (RF) signal, which includes a plurality of single-channel RF signals modulated at different carrier frequencies. The system down-converts the received wideband multi-channel RF signal to baseband, and records the down-converted signal.

Analog signal recording system

One embodiment of the present invention provides a system for controlling operations of an amplifier in a wireless transmitter. During operation, the system receives a baseband signal to be transmitted, and dynamically switches an operation mode of the amplifier between a high power back-off mode having a first power back-off factor and a normal mode having a second power back-off factor based on a level of the baseband signal.

High efficiency adaptive RF transmitter

One embodiment of the present invention provides a system for controlling operations of a power amplifier in a wireless transmitter. During operation, the system receives a baseband signal to be transmitted, and dynamically switches an operation mode of the power amplifier between a high power back-off mode having a first power back-off factor and a normal mode having a second power back-off factor based on a level of the baseband signal.

High efficiency and high linearity adaptive power amplifier for signals with high papr

One embodiment of the present invention provides an automatic gain control (AGC) module for a wireless communication system that includes a plurality of amplifiers. The AGC module includes a receiving mechanism configured to receive an input that indicates a total amount of gain adjustment; a collecting mechanism configured to collect a number of parameters associated with the amplifiers; a determining mechanism configured to determine a desired performance requirement; a gain-control engine configured to generate a gain profile for the amplifiers based on the collected parameters, the total amount of gain, and the desired performance requirement; and an output mechanism configured to output a plurality of control signals based on the generated gain profile, wherein a respective control signal independently controls gain of a corresponding amplifier, thereby enabling the wireless communication system to achieve the total amount of gain adjustment while meeting the desired performance requirement.

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Campbell, CA, United States of America

Tao Li