Powerwave Technologies, Inc.

Intel Corporation

Ezmarai Arbab

Alexander Rabinovich

Bill Vassilakis

Mark Gurvich

Nikolai Maslennikov

Matthew J Hunton

An on frequency repeater for wireless networks with feedback oscillation detection is disclosed. The on frequency repeater includes an automatic gain control loop which samples amplified signal envelope. The automatic gain control loop is monitored and a characteristic saw tooth pattern in the gain control loop indicating feedback oscillation is detected. A nonlinear gain expander circuit may be periodically activated to allow feedback oscillation detection in repeater applications employing linearized amplifiers.

On frequency repeater with AGC stability determination

A delay mismatched feed forward power amplifier is disclosed. Loopincludes a main amplifier and is used to derive a carrier cancelled sample of the main amplifier output. Loopincludes an error amplifier used to amplify the carrier cancelled signal derived from Loopoperation in order to cancel distortion products generated due to the nonlinear nature of the main amplifier. Loopalso utilizes a very short Loopdelay line. A significant efficiency gain is provided due to reduced output power losses associated with the Loopdelay line. Lower output losses also results in lower distortion levels produced by the main amplifier. This, in turn, reduces the size and performance requirements placed on the error amplifier. A smaller and more efficient error amplifier is employed resulting in further amplifier system efficiency improvement. The delay mismatch is compensated by a third control loop, a special adaptive control algorithm or a combination thereof.

Enhanced efficiency feed forward power amplifier with delay mismatched error cancellation loop

A feed forward power amplifier is disclosed which utilizes three signal cancellation loops. Loopincludes a main amplifier and is used to derive a carrier cancelled sample of the main amplifier output. Loopincludes an error amplifier used to amplify the carrier cancelled signal derived from Loopoperation in order to cancel distortion products generated due to the nonlinear nature of the main amplifier. Loopalso utilizes a very short Loopdelay line. A significant efficiency gain is provided due to reduced output power losses associated with the Loopdelay line. Lower output losses also results in lower distortion levels produced by the main amplifier. This, in turn, reduces the size and performance requirements placed on the error amplifier. A smaller and more efficient error amplifier is employed resulting in further amplifier system efficiency improvement. A spurious signal detector for out-of-band distortion detection and an associated microcontroller for Loopand Loopcontrol are also provided. A third signal cancellation loop is utilized to sample the amplifier output and reduce the carrier level of the signals sampled at the output of the amplifier before providing the sampled output to the spurious signal detector. By significantly reducing the carrier power level relative to distortion power levels a cost effective spurious signal detector can be utilized. This also provides a faster conversion time in Loopcancellation and enhanced cancellation of out-of-band distortion products due to a greater useful dynamic range available for the DSP employed in the spurious signal detector.

Enhanced efficiency feed forward power amplifier utilizing reduced cancellation bandwidth and small error amplifier

A feed forward RF power amplifier which provides both high efficiency and minimal distortion in broad bandwidth RF applications. The feed forward power amplifier includes a main amplifier biased to provide high efficiency and an error amplifier biased to provide highly linear operation through substantially the entire operating range. Signal peaks which introduce distortion components at the main amplifier output are cancelled by the linear operation of the error amplifier.

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Laguna Niguel, CA, United States of America

Ezmarai Arbab