Dsp Group Limited

Agere Systems Inc.

Michael E Butenhoff

Jaekyun Moon

Younggyun Kim

Barrett J Brickner

Yongwang Ding

Paul C Edwards

William Martin Snelgrove

James Arthur Bailey

Angus William McLaren

Raymond Chik

The disclosure relates to an automatic level control technique for RF amplifiers in a communication system, such as a wireless communication system. The invention provides an automatic level control technique to compensate for variations in the gain of an RF amplifier, which may be a transmitter amplifier or a receiver amplifier. In accordance with the invention, the gain of the RF amplifier can be controlled as a function of the output of a voltage controlled oscillator (VCO) circuit provided in the communication system. A VCO typically includes a buffer amplifier with a structure similar to that of the RF amplifier used in the transmit or receive side of the RF front-end. By tracking changes in the output of the VCO buffer amplifier, an automatic level control (ALC) input to the RF amplifier can be adjusted to compensate for process- and temperature-based variations in amplifier gain.

Automatic level control for radio frequency amplifiers

An apparatus for dynamic diversity signal reception based upon receiver-side link quality assessments includes two or more antennae. At least one switch is connected to the two or more antennae. A dynamic diversity controller is connected to the at least one switch. The dynamic diversity controller includes a link quality assessor to assess link quality and generate a link characterization value. A diversity configuration selector, responsive to the link characterization value, selectively activates the at least one switch to implement a dynamic diversity configuration. The link quality assessor includes a signal strength analyzer, a modem detector, and/or a MAC layer analyzer to assess the received signal and generate the link characterization value.

Apparatus and method for dynamic diversity based upon receiver-side assessment of link quality

Various devices, circuits and systems including filter sections for creating complex poles are described herein. For example, various circuits including transistors, tuning capacitors and resistors are described. In the circuits, the tuning capacitor is electrically coupled between the gate and source of the transistor, and the resistor is electrically coupled to the gate of the transistor. In one configuration, the circuit input is applied to the gate of the transistor via the resistor, and the output is taken from the source of the transistor. In another configuration, the input is applied to the source of the transistor, and the output is taken from the same source. In yet another configuration, the input is applied at the source of the transistor and the output is taken from the drain of the transistor.

Systems and methods for creating complex poles

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Savage, MN, United States of America

Michael E Butenhoff