Nxp USA, Inc.

Intersil Americas Inc.

Qi Wu

Fang Shi

Qi Hua

Changyang Wang

Yunfei Wang

Wenming Li

Jin Ming

Fan You

Kai Bao

Tonghe Liu

A radio frequency amplifier includes a first input terminal, a second input terminal, an output terminal, and first and second amplifiers. The first amplifier includes a first amplifier input coupled to the first input terminal, and a first amplifier output. The second amplifier includes a second amplifier input coupled to the second input terminal, and a second amplifier output coupled to the output terminal by an output inductive element. An output combiner circuit is coupled between the first amplifier output and the second amplifier output. The output combiner circuit includes a first inductive element, a capacitor, and a second inductive element. The first inductive element is coupled between the first amplifier output and a first terminal of the capacitor, and the second inductive element is coupled between the second amplifier output and the first terminal of the capacitor. A second terminal of the capacitor is coupled to ground.

Radio frequency amplifier

A Doherty amplifier includes first and second input terminals, first and second amplifiers, and an output combiner circuit. The first amplifier includes a first amplifier input coupled to the first input terminal, and a first amplifier output. The second amplifier includes a second amplifier input coupled to the second input terminal, and a second amplifier output. The output combiner circuit is coupled between the first amplifier output, the second amplifier output, and a final summing node. The output combiner circuit includes a first inductive element, a first capacitor integrated within an integrated passive device (IPD), and a second inductive element. The first inductive element is coupled between the first amplifier output and a first terminal of the first capacitor, and the second inductive element is coupled between a combining node and the first terminal of the first capacitor. A second terminal of the first capacitor is coupled to ground.

Doherty amplifiers

An output impedance-matching network for an RF power amplifier die includes a harmonic-prevention circuit that functions like a short circuit at a fundamental frequency of the amplifier and an open circuit at a second harmonic frequency of the amplifier. In certain implementations, the harmonic-prevention circuit has one or more parallel, reactive (LC) legs that resonate at the fundamental frequency and a parallel, reactive (capacitive) leg that causes the harmonic-prevention circuit to resonate at the second harmonic frequency. The harmonic-prevention circuit improves power transfer and efficiency of the RF power amplifier.

Output impedance-matching network having harmonic-prevention circuitry

Video analytics systems and methods are described that typically comprise a video encoder operable to generate macroblock video analytics metadata (VAMD) from a video frame. Functional modules receive the VAMD and an encoded version of the video frame is configured to generate video analytics information related to the frame using the VAMD and the encoded video frame. The downstream decoder can use the VAMD to obtain a global motion vector related to the frame, detect and track motion of an object within the frame and monitor a line provided or found within the frame. Traversals of the line by a moving object can be detected and counted using information in the VAMD and the line may be part of a polygon that delineates an area to be monitored within the encoded frame. The VAMD can comprise macroblock level and video frame level information.

Systems and methods for video content analysis

Growing community of inventors

Chengdu, China

Qi Wu