Ehsan Afshari from Ann Arbor, MI, age 44

Wikipedia References

Ehsan Afshari

Resumes

Professor

view source

Location:

Ithaca, NY

Industry:

Electrical/Electronic Manufacturing

Work:

University of Michigan
Professor
Cornell University Aug 2006 - May 2012
Assistant Professor
Cornell University Aug 2006 - May 2012
Associate Professor

Education:

Caltech 2001 - 2006
Doctorates, Doctor of Philosophy, Engineering Sharif University of Technology 1997 - 2001
Bachelors, Bachelor of Science, Engineering

Skills:

Signal Processing
Nanotechnology
Circuit Design
Simulink
Microfabrication
Algorithms
Mathematica
Nanofabrication
Mathematical Modeling
Analog Circuit Design
Mems
Characterization
Physics
Labview
Sensors
Image Processing
Numerical Analysis
Comsol
Machine Learning
Cadence Virtuoso
Vhdl
Afm
Pspice
Cmos
Ansys
Semiconductors
Digital Signal Processors
Materials Science
Spice
Optics
Computer Architecture
Biomedical Engineering
Microfluidics
Experimentation
Spectroscopy
Photonics
Numerical Simulation
Vlsi
Photolithography
Thin Films
Mixed Signal
Nanomaterials
Scanning Electron Microscopy
Fortran
Information Theory
Computer Vision

Us Patents

2D Transmission Line-Based Apparatus And Method
view source
US Patent:

7671702, Mar 2, 2010
Filed:

Oct 16, 2008
Appl. No.:

12/252713
Inventors:

Ehsan Afshari - Pasadena CA, US
Harish Bhat - Union City CA, US
Seyed Ali Hajimiri - Pasadena CA, US
Assignee:

California Institute of Technology - Pasadena CA
International Classification:

H03H 5/12
H03H 7/38
US Classification:

333124, 333125, 333127, 333128, 333136
Abstract:

A power combiner comprising an LC lattice structure is shown, together with a method for generating a planar wave front. The LC structure can comprise constant or voltage dependent capacitors. Either the delay or the characteristic impedance of the two-dimensional transmission line formed by the LC lattice structure are kept constant. A planar wave propagating along one direction of the transmission line gradually experiences higher impedances at the edges, creating a lower resistance path for the current in the middle. This funnels more power to the center as the wave propagates.

Electrical Funnel: A Novel Broadband Signal Combining Method
view source
US Patent:

8085109, Dec 27, 2011
Filed:

Sep 22, 2006
Appl. No.:

11/525682
Inventors:

Ehsan Afshari - Newfield NY, US
Seyed Ali Hajimiri - Pasadena CA, US
Assignee:

California Institute of Technology - Pasadena CA
International Classification:

H01P 5/04
H03H 7/32
US Classification:

333 24R, 333138, 703 6
Abstract:

An electrical signal transformation device configured for emulation of physical, for example, optical, phenomena and/or a mathematical or logical process. The device employs a first plurality, second plurality and third plurality of electrical components each having a first terminal and a second terminal. The first plurality and second plurality of electrical components are arranged along a first direction and a second direction respectively, to form a planar two dimensional lattice. The first plurality of electrical components are configured to provide at least one of a constant signal propagation velocity and/or amplitude while the second plurality of electrical components are configured to provide at least one of a varying signal propagation velocity and/or amplitude. The lattice includes at least two input signal nodes and at least one output signal node and is configured to transform and communicate a plurality of input signals from the input node to the output node.

Doppler-Inspired, High-Frequency Signal Generation And Up-Conversion
view source
US Patent:

8466832, Jun 18, 2013
Filed:

Sep 28, 2010
Appl. No.:

12/892210
Inventors:

Ehsan Afshari - Newfield NY, US
Omeed Momeni - Ithaca NY, US
Assignee:

Cornell University - Ithaca NY
International Classification:

G06G 7/12
US Classification:

342175, 331101, 327355, 342 22, 342 70, 342192, 342196
Abstract:

Doppler-inspired methods for signal generation and frequency up-conversion are provided that are compatible with CMOS technology. In accordance with an embodiment, a circuit is provided that includes two input signals that can propagate on artificial transmission lines in opposite directions, resembling the relative movement of source and observer in Doppler frequency shift; and an output signal combiner. By controlling the characteristics of the transmission lines and the input signal frequencies, the harmonic generation of active devices is utilized and combined to provide the desired high-frequency component at the output.

Electrical Prism: A High Quality Factor Filter For Millimeter-Wave And Terahertz Frequencies
view source
US Patent:

8604893, Dec 10, 2013
Filed:

Dec 22, 2009
Appl. No.:

12/744869
Inventors:

Ehsan Afshari - Newfield NY, US
Omeed Momeni - Ithaca NY, US
Assignee:

Cornell University - Ithaca NY
International Classification:

H03H 7/46
H03H 5/00
US Classification:

333132, 333169
Abstract:

Filters and methods which may be used with millimeter-wave and terahertz frequency range are disclosed. The filter is formed as an electrical prism which may include a first lattice forming an interface with a second lattice. Each lattice may include a plurality of passive elements, such as inductors, capacitors, and the like. The first lattice may include an input disposed at an input boundary thereof, while the second lattice may include an output disposed at an output boundary thereof. Furthermore, the first and second lattices may be configured to receive a signal at the input of the first lattice, propagate the signal to the interface, and direct the signal to the outputs of the second lattice.

2D Transmission Line-Based Apparatus And Method
view source
US Patent:

20070030102, Feb 8, 2007
Filed:

Apr 28, 2006
Appl. No.:

11/413613
Inventors:

Ehsan Afshari - Pasadena CA, US
Harish Bhat - Union City CA, US
Seyed Hajimiri - Pasadena CA, US
International Classification:

H01P 1/00
US Classification:

333263000
Abstract:

A power combiner comprising an LC lattice structure is shown, together with a method for generating a planar wave front. The LC structure can comprise constant or voltage dependent capacitors. Either the delay or the characteristic impedance of the two-dimensional transmission line formed by the LC lattice structure are kept constant. A planar wave propagating along one direction of the transmission line gradually experiences higher impedances at the edges, creating a lower resistance path for the current in the middle. This funnels more power to the center as the wave propagates.

Performing Analog-To-Digital Conversion By Computing Delay Time Between Traveling Waves In Transmission Lines
view source
US Patent:

20090295613, Dec 3, 2009
Filed:

May 8, 2009
Appl. No.:

12/437669
Inventors:

Arjang Hassibi - Austin TX, US
Ehsan Afshari - Newfield NY, US
Chaoming Zhang - Austin TX, US
Jacob Abraham - Austin TX, US
Assignee:

Board of Regents, The University of Texas System - Austin TX
Cornell University - Ithaca NY
International Classification:

H03M 1/12
US Classification:

341155
Abstract:

A method and device for converting an analog input electrical signal to a digital signal. A plurality of integrated active and/or passive transmission lines may be implemented with signal-dependant propagation velocities. The delay differences of pulses traveling through these transmission lines are compared, and the collective results are used to evaluate and subsequently quantize the input signal.

Generation Of High-Frequency, High-Power Electrical Signals From Low-Frequency, Low-Power Lattice Network Structures As Sources
view source
US Patent:

20110194324, Aug 11, 2011
Filed:

May 19, 2009
Appl. No.:

12/994203
Inventors:

Ehsan Afshari - Ithaca NY, US
Harish Bhat - Merced CA, US
Assignee:

Cornell University - Ithaca NY
International Classification:

H02M 5/02
US Classification:

363159
Abstract:

An apparatus and method for outputting high-frequency, high-power signals from low-frequency, low-power input is disclosed. The apparatus and method may provide a two-dimensional nonlinear lattice having a plurality of inductors and voltage-dependent capacitors intersecting at a plurality of nodes. Two or more adjacent boundaries of the nonlinear lattice may be provided with input signals which constructively interfere to output a signal of substantially higher amplitude and higher frequency than those of the input signals.

Tunable Signal Source
view source
US Patent:

20130082785, Apr 4, 2013
Filed:

Oct 4, 2012
Appl. No.:

13/573773
Inventors:

Ehsan Afshari - Ithaca NY, US
Yahya M. Tousi - San Jose CA, US
Assignee:

Cornell University with its principal place of business at Cornell Center for Technology - Ithaca NY
International Classification:

H03B 28/00
US Classification:

331 48
Abstract:

The present disclosure provides a tunable signal source having a plurality of oscillator cores having a coupling input, a coupling output, and a power output that is common to each of the plurality of oscillator cores. Also included is a plurality of tunable phase shifters wherein corresponding ones of the plurality of tunable phase shifters are communicatively coupled between the coupling input and the coupling output of corresponding ones of the plurality of oscillator cores, thereby forming a loop of alternating ones of the plurality of oscillator cores and alternating ones of the plurality of tunable phase shifters.