Google Inc.

Pierre-Luc Cantin

Olivier Temam

Teckgyu Kang

Woon Seong Kwon

Richard Roy

A circuit for performing neural network computations for a neural network is described. The circuit includes plurality of neural network layers each including a crossbar arrays. The plurality of crossbar arrays are formed in a common substrate in a stacked configuration. Each crossbar array includes a set of crosspoint devices. A respective electrical property of each of the crosspoint devices is adjustable to represent a weight value that is stored for each respective crosspoint device. A processing unit is configured to adjust the respective electrical properties of each of the crosspoint devices by pre-loading each of the crosspoint devices with a tuning signal. A value of the turning signal for each crosspoint device is a function of the weight value represented by each respective crosspoint device.

Neural network crossbar stack

A computing unit for accelerating a neural network is disclosed. The computing unit may include an input unit that includes a digital-to-analog conversion unit and an analog-to-digital conversion unit that is configured to receive an analog signal from the output of a last interconnected analog crossbar circuit of a plurality of analog crossbar circuits and convert the second analog signal into a digital output vector, and a plurality of interconnected analog crossbar circuits that include the first interconnected analog crossbar circuit and the last interconnected crossbar circuits, wherein a second interconnected analog crossbar circuit of the plurality of interconnected analog crossbar circuits is configured to receive a third analog signal from another interconnected analog crossbar circuit of the plurality of interconnected crossbar circuits and perform one or more operations on the third analog signal based on the matrix weights stored by the crosspoints of the second interconnected analog crossbar.

Accelerating neural networks in hardware using interconnected crossbars

Embedded air gap transmission lines and methods of fabrication are provided. An apparatus having an air gap transmission line can include a first conductive plane, a core dielectric layer having a bottom surface in contact with the first conductive plane, a conductor having a bottom surface in contact with a top surface of the core dielectric layer, and a second conductive plane positioned over, and spaced apart from, a top surface of the conductor such that a gap separates the conductor from the second conductive plane. The top surface of the conductor is separated from the bottom surface of the second conductive plane by a first distance measured along an axis normal to the first conductive plane, and the bottom surface of the conductor is separated from the first conductive plane by a second distance greater than the first distance measured along the axis.

Growing community of inventors

Palo Alto, CA, United States of America

Pierre-Luc Cantin