Broadcom Corporation

Avago Technologies General IP (singapore) Pte. Ltd.

Avago Technologies International Sales Pte. Limited

Broadcom Corportion

Hooman Darabi

Ahmadreza Rofougaran

Mohyee Mikhemar

Ahmad Mirzaei

Maryam Rofougaran

Brima Babatunde Ibrahim

David Patrick Murphy

Alireza Zolfaghari

Claude G Hayek

Vafa James Rakshani

Yuyu Chang

Henrik Tholstrup Jensen

Frederic Christian Marc Hayem

Amir Hadji-Abdolhamid

John Cumming Leete

Shahla Khorram

Alex Mirzaei

Nelson Ray Sollenberger

Masoud Kahrizi

Janice Chiu

Arya Behzad

Ramon Alejandro Gomez

David Garrett

Hea Joung Kim

Hao Fang Wu

Qiang (Tom) Li

Franciscus Van Der Goes

Mohammad Nariman

Meng-An Pan

Qiang Li

Jacob Jude Rael

Behnam Mohammadi

Stephen Wu

Murat Mese

Bo Zhang

Shervin Moloudi

William T Colleran

Paul Anthony Lettieri

Anatoly Gelman

Ronish Patel

Yossi Cohen

Ahmad Yazdi

Kiran Puttegowda

Philippe Riondet

Ed Chien

Michael Youssef

Zhimin Zhou

Louie Serrano

Hao Xu

Seunghwan Yoon

Alfred Grau Besoli

Tirdad Sowlati

Rahul Magoon

Ali Afsahi

Rohit Gaikwad

Weidong Rick Li

Andrew Robert Adams

Dandan Li

Keith Andrews Carter

Morteza Vadipour

Kent Charles Oertle

Ming Wang Sze

Paul Chang

Mike (Hon Fai) Chu

Oiang Li

Ali Medi

Ken Evans

Xiongchuan Huang

Milad Darvishi

Min-Chung Ho

Shao-Min Hsu

Tom (Qiang) Li

Jianping Peng

Shrlung Chen

Eric Raith

Yiannis Kokolakis

Hon Fai (Mike) Chu

The present disclosure is directed to an apparatus and method for cancelling self-interference caused by full-duplex communication. In a full-duplex communication device, the receiver will generally experience significant self-interference from the full-duplex communication device's own transmitter transmitting a strong outbound signal over the same channel that the receiver is to receive a weak inbound signal. The apparatus and method are configured to adjust a phase and gain of the outbound signal provided at the output of a power amplifier (PA) and inject the phase and gain adjusted outbound signal at the input of a low-noise amplifier (LNA) to cancel the interference from the outbound signal in the inbound signal.

Self-interference cancellation for full-duplex communication using a phase and gain adjusted transmit signal

A circuit for providing a fractional divider/multiplier using harmonic recombination may include a power amplifier, an oscillator coupled to the power amplifier, and a divider coupled to the oscillator. In one or more implementations, the divider is configured to generate one or more phases of a harmonic from the oscillator to reduce signal interference from the power amplifier. In one or more implementations, the divider includes a divide-by-M divider, where M is a positive integer, and an array of transconductance cells coupled to the output of the divide-by-M divider. In one or more implementations, the divider includes an inductor or a filter coupled to the output of the array of transconductance cells. In one or more implementations, the oscillator includes a logical gate and a resistor-capacitor circuit coupled in series feedback with a multi-stage ring oscillator. The oscillator may include a divider coupled to the multi-stage ring oscillator.

Low-power local oscillator generation

A device includes circuitry configured to implement one or more PHY communications protocols to simultaneously communicate with one or more stations via communication links on one or more wireless networks, communicate with additional devices via a backhaul network, and exchange collaboration data, including at least one of protocol data or collaborative beamforming data, with the additional devices via the backhaul network to maintain signal parameters of communications signals with the one or more stations.

Collaborative operation of software defined radios

A linear, low noise, high quality factor (Q) and widely tunable notch filter circuit includes one or more first reactive elements coupled between a first filter node and a first node. The notch filter circuit further includes a multi-branch circuit having multiple parallel branches and coupled between the first node and a second node. Each branch of the multi-branch circuit includes at least a switch coupled to a variable capacitor. A notch frequency of the notch filter circuit is tunable by adjusting a capacitance of the variable capacitor.

Linear, low noise, high Q and widely tunable notch filter

According to one embodiment, a compact low-power receiver comprises first and second analog circuits connected by a digitally controlled interface circuit. The first analog circuit has a first direct-current (DC) offset and a first common mode voltage at an output, and the second analog circuit has a second DC offset and a second common mode voltage at an input. The digitally controlled interface circuit connects the output to the input, and is configured to match the first and second DC offsets and to match the first and second common mode voltages. In one embodiment, the first analog circuit is a variable gain control transimpedance amplifier (TIA) implemented using a current mode buffer, the second analog circuit is a second-order adjustable low-pass filter, whereby a three-pole adjustable low-pass filter in the compact low-power receiver is effectively produced.

Adjustable low-pass filter in a compact low-power receiver

A wireless communication device includes a first circuit including a baseband circuit and a radio circuit, and at least one frontend module (FEM) remote from the first circuit and placed in close proximity to and coupled to at least one radio-frequency (RF) antenna. The FEM is coupled to the first circuit via interface circuitry. An FEM comprises a frontend (FE) circuit including one or more low-noise amplifiers (LNAs), one or more power amplifiers (PAs), and at least one of a multi-pole switch and a multiplexer. The multi-pole switch and the multiplexer being implemented on a first side of the FEM coupled to the interface circuitry. The interface circuitry includes at least some of filters, splitters, multi-pole switches, and multiplexers to reduce a count of interconnect routes to the at least one FEM.

Wireless transceiver with remote frontend

A receiver includes circuitry configured to determine one or more first local oscillator (LO) harmonics that correspond to one or more first spectrum segments of a down-converted received signal based on characteristics of the received signal. The one or more first LO harmonics of the received signal are amplified by applying one or more first transconductance coefficients to one or more first harmonic selective transinductance amplifiers (TIAs) corresponding to the one or more first spectrum segments. Digitized outputs of the plurality of harmonic selective TIAs are calibrated based on an amount of signal leakage between the plurality of spectrum segments of the down-converted received signal.

Harmonic selective full-band capture receiver with digital harmonic rejection calibration

A device includes circuitry configured to detect one or more properties of an image signal based on outputs from one or more (analog-to-digital converter) ADC configurations of a transceiver, determine a VCO frequency corresponding to an ADC sampling frequency independently from a carrier frequency, and control the VCO frequency of at least one of a transmitter or receiver based on the one or more properties of the image signal.

System, device, and method for improving radio performance

Embodiments of a four-port isolation module are presented herein. In an embodiment, the isolation module includes a step-up autotransformer comprising a first and second winding that are electrically coupled in series at a center node. The first port of the isolation module is configured to couple an antenna to a first end node of the series coupled windings. The second port of the isolation module is configured to couple a balancing network to a second end node of the series coupled windings. The third port is configured to couple a transmit path to the center node. The fourth port is configured to couple a differential receive path across the first end node and the second end node. The isolation module effectively isolates the third port from the fourth port to prevent strong outbound signals received at the third port from saturating an LNA coupled to the fourth port.

RF front-end with wideband transmitter/receiver isolation

A circuit for an oscillator with common-mode resonance includes a first oscillator circuit and a second oscillator circuit coupled to the first oscillator circuit. Each of the first oscillator circuit or the second oscillator circuit includes a tank circuit, a cross-coupled transistor pair, and one or more capacitors. The tank circuit is formed by coupling a first inductor with a pair of first capacitors. The cross-coupled transistor pair is coupled to the tank circuit, and one or more second capacitors are coupled to the tank circuit and the cross-coupled transistor pair. Each of the first oscillator circuit or the second oscillator circuit allows tuning of a respective common mode (CM) resonance frequency (F) to be at twice a respective differential resonance frequency (F).

CMOS VCO with implicit common-mode resonance

The present disclosure is directed to a system and method for performing the outphasing technique without using a combiner at the output of two power amplifiers to reduce loss and distortions.

Outphasing transmitter systems and methods

A circuit for a low-loss duplexer with noise cancellation in a receive (RX) path of a transceiver includes a duplexer, a balancing network, and a noise cancellation circuit. The duplexer circuit is coupled to an antenna of the transceiver. The balancing network is coupled to the duplexer and provides an impedance matching an impedance associated with the antenna. The noise cancellation circuit senses a noise signal generated by the balancing network and uses the sensed noise signal to improve a signal-to-noise ratio (SNR) of the RX path.

Low-loss electrical balance duplexer with noise cancellation

A device includes circuitry configured to determine noise shaping parameters for one or more transmit signals on one or more transmit channels based on transmission protocol and spectral mask criteria. Frequency positions are identified for the one or more transmit channels based on the noise shaping parameters, and the noise shaping parameters are applied to the one or more transmit signals.

System, device, and method for shaping transmit noise

Growing community of inventors

Laguna Niguel, CA, United States of America

Hooman Darabi