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Ali Ali Afsahi

from San Diego, CA
Age ~49
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Also known as:
Afsahi Ali
Phone and address:
5648 Shannon Ridge Ln, San Diego, CA 92130
Related to:
Ali M Haile, 55Basel A Ali, 47Shahram AfsahiSeyedabbas Afsahi, 78Esmaili Ghazaleh, 49
Connected to:
Afsaneh Afsaneh, 58Amir H Afsar, 46Jehan Afsar, 88Lauren A Afsar, 36Mohammed N Afsar, 55Uddin Afsar, 56Uz Z AfsarRouzbeh Afsari, 44Maryam B Afsarzadeh, 80Nicole P Afseth, 51

Ali Afsahi Phones & Addresses

  • 5648 Shannon Ridge Ln, San Diego, CA 92130
  • 12143 Branicole Ln, San Diego, CA 92129
  • 1011 Lemon St, Tempe, AZ 85281 (480) 446-7051
  • 944 Terrace Rd, Tempe, AZ 85281 (480) 446-7051

Work

Company: Broadcom Feb 2016 Position: Distinguished engineer

Education

Degree: Doctorates, Doctor of Philosophy School / High School: Uc San Diego Specialities: Philosophy

Skills

Semiconductors • Integrated Circuit Design • Circuit Design • Rf • Verilog • Simulations • Cadence Virtuoso • Ofdm • Mimo

Industries

Semiconductors

Resumes

Resumes

Ali Afsahi Photo 1

Distinguished Engineer

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Location:
2660 Magnolia Ave, Los Angeles, CA 90007
Industry:
Semiconductors
Work:
Broadcom
Distinguished Engineer
Broadcom Mar 1, 2010 - May 2013
Senior Manager, Ic Design Engineering
Broadcom May 2007 - May 2010
Senior Staff Ic Design
Broadcom Nov 2004 - May 2007
Staff Ic Design
Education:
Uc San Diego
Doctorates, Doctor of Philosophy, Philosophy
Skills:
Semiconductors
Integrated Circuit Design
Circuit Design
Rf
Verilog
Simulations
Cadence Virtuoso
Ofdm
Mimo

Publications

Us Patents

Method And System For A Highly Efficient Power Amplifier Utilizing Dynamic Biasing And Predistortion

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US Patent:
7492223, Feb 17, 2009
Filed:
Dec 31, 2006
Appl. No.:
11/618877
Inventors:
Arya Behzad - Poway CA, US
Ali Afsahi - San Diego CA, US
Vikram Magoon - San Diego CA, US
Assignee:
Broadcom Corporation - Irvine CA
International Classification:
H03G 3/20
US Classification:
330136, 330261, 330149
Abstract:
Aspects of a method and system for a highly efficient power amplifier (PA) utilizing dynamic biasing and predistortion are presented. Aspects of the system may include a processor that enables computation of a value of a variable bias component of a bias current based on a bias slope value and an amplitude of an envelope input signal. The processor may enable computation of a value of the bias current based on the selected constant bias current component value and the variable bias current component value. A PA may enable generation of an output signal in response to a generated baseband signal by utilizing the bias current to amplify an amplifier input signal. The bias current may be generated based on the envelope input signal. A feedback signal may be generated based on the output signal, which may be used to predistort a subsequent baseband signal.

Phase Shifter And Current Mode Mixer

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US Patent:
7545855, Jun 9, 2009
Filed:
Sep 12, 2005
Appl. No.:
11/224609
Inventors:
Ali Afsahi - San Diego CA, US
Arya Reza Behzad - Poway CA, US
Assignee:
Broadcom Corporation - Irvine CA
International Classification:
H04B 1/38
US Classification:
375219, 455 73, 710 1
Abstract:
An integrated circuit radio transceiver comprises an integrated phase shift mixer for generating a phase and frequency shifted output signal to at least a portion of one of a transmitter or receiver front end. The integrated phase shift mixer includes a phase shift block that is operable to produce a phase shifted current signal at an output of the phase shift block and a mixer that is operable to produce the phase and frequency shifted output signal based upon the phase shifted current signal. One aspect of the present invention is that the phase shift block produces an output as a current signal and the mixer block is operably disposed and formed to receive the current signal produced by the phase shift block. Thus, the mixer includes a folded cascode mixer that provides a substantially low input impedance.

Current Mode Phase Shifter, Mixer And Amplifier

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US Patent:
7545856, Jun 9, 2009
Filed:
Sep 12, 2005
Appl. No.:
11/224610
Inventors:
Arya Reza Behzad - Poway CA, US
Ali Afsahi - San Diego CA, US
Assignee:
Broadcom Corporation - Irvine CA
International Classification:
H04B 1/38
US Classification:
375219, 455 73, 710 1
Abstract:
An integrated circuit radio transceiver includes a phase shift block that is operable to produce a phase shifted current signal at an output of the phase shift block and a mixer with a low input impedance that is operable to produce a phase and frequency shifted output current signal based upon the phase shifted current signal. One aspect of the present invention is that the phase shift block produces an output as a current signal and the mixer block is operably disposed and formed to receive the current signal produced by the phase shift block. Similarly, an operational amplifier configured in a low input impedance mode is provided to receive and amplify a current signal mixer output, all to maximize signal processing head room reduce circuit noise and improve linearity.

Method And System For Enhancing Efficiency By Modulating Power Amplifier Gain

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US Patent:
7729671, Jun 1, 2010
Filed:
Dec 31, 2006
Appl. No.:
11/618871
Inventors:
Ali Afsahi - San Diego CA, US
Vikram Magoon - San Diego CA, US
Arya Behzad - Poway CA, US
Assignee:
Broadcom Corporation - Irvine CA
International Classification:
H01Q 11/12
H04B 1/04
US Classification:
4551271, 4551272
Abstract:
Aspects of a method and system for enhancing efficiency by modulating power amplifier (PA) gain are presented. Aspects of the system may comprise a PA gain modulator that enables modification of an amplitude of a digital baseband signal. A baseband processor may enable computation of a first gain value based on the modification. The baseband processor may enable computation of a second gain value based on the first gain value. A PA may enable generation of an RF output signal based on the modified digital baseband signal and the second gain value.

Cascode Cmos Rf Power Amplifier With Programmable Feedback Cascode Bias Under Multiple Supply Voltages

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US Patent:
7786807, Aug 31, 2010
Filed:
Apr 23, 2009
Appl. No.:
12/428616
Inventors:
Mingyuan Li - San Diego CA, US
Ali Afsahi - San Diego CA, US
Arya Reza Behzad - Poway CA, US
Assignee:
Broadcom Corporation - Irvine CA
International Classification:
H03F 3/04
US Classification:
330311, 330290
Abstract:
A Radio Frequency (RF) cascode power amplifier operates with differing battery supply voltages. A transconductance stage has a transistor with an RF signal input at its gate. A cascode stage has at least one cascode transistor, the cascode stage coupled in series with the transconductance stage between a battery voltage node and ground, the cascode stage having an RF signal output at the battery voltage node and at least one bias input to the at least one cascode transistor. Cascode bias feedback circuitry applies fixed bias voltage(s) to the at least one two bias inputs for a low battery voltage and applies feedback bias voltage(s) to the at least two bias inputs for a high battery voltage, the feedback bias voltage(s) based upon a voltage of the battery voltage node. More than two differing battery supply voltages are supported.

Composite Differential Rf Power Amplifier Layout

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US Patent:
7821339, Oct 26, 2010
Filed:
Apr 27, 2009
Appl. No.:
12/430654
Inventors:
Ali Afsahi - San Diego CA, US
Assignee:
Broadcom Corporation - Irvine CA
International Classification:
H03F 3/45
US Classification:
330253, 330261
Abstract:
A composite differential Radio Frequency (RF) power amplifier includes a plurality of differential RF cascode power amplifiers coupled in parallel. Each differential RF cascode power amplifier includes a positive transconductance stage and a positive cascode stage coupled in series with the positive transconductance stage between a voltage node and ground. Each also includes a negative transconductance stage and a negative cascode stage coupled in series with the negative transconductance stage between the voltage node and ground. The plurality of parallel differential RF cascode power amplifiers resides adjacent one another in a single semiconductor substrate such that the positive transconductance stage of a first differential RF cascode power amplifier resides adjacent a negative transconductance stage of a second differential RF cascode power amplifier and the positive cascode stage of the first differential RF cascode power amplifier resides adjacent a negative cascode stage of a second differential RF cascode power amplifier.

Rfic With High Power Pa

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US Patent:
7853234, Dec 14, 2010
Filed:
Dec 10, 2009
Appl. No.:
12/635604
Inventors:
Ali Afsahi - San Diego CA, US
Assignee:
Broadcom Corporation - Irvine CA
International Classification:
H04B 1/28
US Classification:
455333, 4551273, 455334, 455341, 375219, 330124 R
Abstract:
A radio frequency (RF) front-end includes a plurality of power amplifier modules and a plurality of impedance matching circuits. Each of the plurality of impedance matching circuits includes an input connection and an output connection, wherein outputs of the plurality of power amplifier modules are coupled to corresponding input connections of the plurality of impedance matching circuits to provide a desired loading of the plurality of power amplifier modules and wherein the output connections of the plurality of impedance matching circuits are coupled together to add power of the plurality of power amplifiers.

Method And System For Using A Multi-Rf Input Receiver For Diversity Selection

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US Patent:
7856215, Dec 21, 2010
Filed:
Dec 30, 2006
Appl. No.:
11/618808
Inventors:
Arya Behzad - Poway CA, US
Ali Afsahi - San Diego CA, US
Mark Gonikberg - Los Altos Hills CA, US
International Classification:
H04B 17/00
H04B 17/02
H04B 1/06
H04B 7/00
US Classification:
455130, 455 6711, 455134, 4552262, 4552761
Abstract:
Aspects of a method and system for signal processing are disclosed and may include receiving a plurality of wireless signals via a plurality of M receive antennas. Each of M phase shifters coupled to each of the M receive antennas may be set to operate in a bypass mode or with an arbitrary phase setting. Corresponding signal strengths of M signals generated when each of the M phase-shifters is coupled to each of the M receive antennas may be measured, while at least a portion of the M receive antennas are turned off. Selecting one of the M generated signals for processing without the use of an antenna switch, based on the measured signal strength. A signal strength of each of the generated M amplified signals may be measured while turning off at least one of the plurality of M receive antennas and without the use of the phase-shifters.
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Ali Ali Afsahi from San Diego, CA, age ~49 Get Report