Hi! My name is Mohammad Khorshidian.
I'm a Ph.D. student at Columbia University. I'm an electronics lover and my research area includes RF and mm-wave circuits and systems design. I'm also interested in analog/mixed-signal designs. I'm working under the supervision of Prof. Krishnaswamy in the CoSMIC Lab.
Mohammad Khorshidian
RF&mm-wave circuits and systems designer
Phone:
281-687-7225
Email:
​
Date of Birth:
April 15th, 1994
EDUCATION
2017-2022
Ph.D. Degree
Columbia University
My first research project during my Ph.D. was a high-power, high-efficiency class E/Fodd power amplifier at 2.6GHz where I faced extensive passive design challenges (inductors and transformers) to obtain high K, high Q combiner along with a symmetrical design. Furthermore, I had to overcome reliability concerns of the PA cores (both electromigration due to the high current and also the voltage breakdown of the devices).
As my second project, I designed a tunable notch filter with infinite depth and an RF isolator with low loss in one direction and infinite isolation in the reverse direction using a fully passive negative trans-resistance. In my next research project, I've designed a novel structure which is an impedance-transforming N-path filter offering passive voltage gain. In a mm-wave project, I worked on the design of a mm-wave full front-end with an antenna as part of the circulator. This included the design of a wideband 60GHz aperture coupled antenna which I did in HFSS and ADS.
My last work was about Higher-Order N-path Filter Based on Rotary Clocking in N-Path Filters where I passively frequency shift N-Path filters, opening a potential for higher performance filters without a need for multiple synthesizers.
2016-2018
Master's Degree
Columbia University
I've received my Master of Science degree in Electrical Engineering from Columbia University in the city of New York in May 2018 where I've also been awarded the Master of Science Award of Excellence for the highest GPA. My main area of research is on RF and mm-wave integrated circuit design. I've taken various courses including Microwave circuit design, Millimeter-wave IC design, Communication circuits, Principles of RF and mm-wave measurement, Advanced analog integrated circuits, Analog circuits in VLSI, Random process and noise, Digital signal processing, mmWave & Applications for 5G, Nanophotonics and metamaterials, Quantum mechanics, etc. I've also been honored to be the teaching assistant for three courses "Communication Circuits", "Principle of RF and Microwave measurement", and "mmWave & Applications for 5G" at Columbia University.
2012-2016
Bachelor's Degree
Sharif University of Technology
I've received my B.Sc. degree from Sharif University of Technology in Tehran. My main field of study was about Electronics. I was the teaching assistant for fourteen courses. My B.Sc. project was about Visible Light Communication (VLC) which successfully implemented and tested using a conventional LED with cut off frequency of 2.5 MHz. I've designed a circuit to increase the bit rate up to 10 Mbit/s over the distance of 1 meter. I was also honored to be selected as one of the outstanding B.Sc. projects.
PROJECTS
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An Inductor-Less All-Passive Higher-Order N-path Filter Based on Rotary Clocking in N-Path Filters" (Published in IMS 2022)
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Impedance-Transforming N-path Filter Offering Passive Voltage Gain, 2020
A reconstructed RF voltage from the stacked capacitor in a novel bottom plate N-path structure, a passive voltage gain along with high step-up impedance transformation is achieved. (Published in ISSCC 2021) -
High-Performance Isolators and Notch Filters based on N-Path Negative Trans-Resistance, 2019
By employing novel fully passive LPTV negative trans-resistance, the first high-performance
inductor-less RF-isolator along with a notch filter with infinite depth have been reported. (Published in ISSCC 2020) -
N-Path Low-Pass Filter Based on Negative Trans-Resistance. Reported for the first time. (Published in IMS 2020 and won the best paper award (2nd place))
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High power, high-efficiency digital power amplifier, 2018
Using stacked floating body devices and systematic design along with precise
layout considerations in order to reach high power, high-efficiency switching
power amplifier at 2.6GHz in GF45nm SOI. (published in IMS 2019) -
180GHz oscillator, millimeter-wave ic design course, 2017
Design of a -110dBc phase noise, 180GHz oscillator using a multiplier proceeded
a 60GHz oscillator in IPL90nm -
2.4GHz LNA, principles of RF and mm-wave measurements course, 2017
Design of a 2.4GHz LNA with 1.2dB NF
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Design and implementation of a Theremin, Communication circuits course, 2017
Design of 200Hz-2KHz Theremin using only five transistors and one op-amp.
A limited number of transistors required the design of single transistor oscillators
and Mixer and overcoming practical issues -
Design of a fully differential switched-capacitor sample-and-hold amplifier,
Advanced Analog Integrated Circuits course, 2017
Using a folded cascode architecture with controlled positive feedback in order
to make it a high gain with the noise and power consumption considerations,
along with a switched capacitor CMFB circuit design -
LiFi(Light Fidelity), transmitting data (10Mbit/s) using visible light over 1meter, B.Sc. project, 2016
Increasing commercial LED bandwidth (from 2.5MHz to 5MHz) for sending data at higher data rates using
pre-emphasis circuit -
Design of a scientific calculator using AVR, Microprocessor course, 2016
Design and PCB implementation of an engineering calculator programmed with AVR
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"ILR"(Implantable Loop Recorder) & "DBS"(Deep Brain Stimulation), research project, 2015
Making a survey on different works about ILR especially the way of charging -
the device inside the body remotely and the effect of DBS on Parkinson patients
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Design of a pipelined A/D architecture in MIPS, Computer architecture course, 2015 Simulation-based pipeline A/D architecture design in MIPS processor using Verilog HDL​
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Design and implementation of a "signal generator", Pulse technique course, 2015
Design and PCB implementation of a signal generator which could generate
pulse, sine, and triangular waves using a limited number of transistors.
COMPUTER SKILLS
Cadence
ADS
MATLAB
IE3D and HFSS
LabView
Altium
EXPERIENCES
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Teaching Assistant, mmWave & Applications for 5G, Columbia University, 2021
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Teaching Assistant, Communication Circuits, Columbia University, 2021
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Teaching Assistant, Principle of RF and mm-Wave measurements, Columbia University, 2017
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Teaching Assistant, Communication Circuits, Columbia University, 2017
Teaching Experiences
Publications
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M. Khorshidian, S.L.N. Garimella, A. Nagulu, H. Krishnaswamy, "An Inductor-Less All-Passive Higher-Order N-path Filter Based on Rotary Clocking in N-Path Filters" 2022 IEEE International Microwave Symposium (IMS).
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M. Khorshidian and H. Krishnaswamy, "An Impedance-Transforming N-path Filter Offering Passive Voltage Gain" in IEEE International Solid-State Circuits Conference (ISSCC), February 2021.
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N. Reiskarimian, M. Khorshidian and H. Krishnaswamy, "Inductorless, Widely-Tunable N-Path Shekel Circulators Based on Harmonic Engineering" invited and submitted to IEEE Journal of Solid-State Circuits (JSSC), (RFIC2020 Special Issue), April 2021.
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M. Khorshidian, N. Reiskarimian and H. Krishnaswamy, "N-Path Low-Pass Filters, Isolators and Enhanced Notch Filters: Theory and Implementation" submitted to IEEE Journal of Solid-State Circuits (JSSC).
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M. Khorshidian, N.Reiskarimian, and H. Krishnaswamy, "A Compact Reconfigurable N-Path Low-Pass Filter Based on Negative Trans-Resistance with <1dB Loss and >21dB Out-of-Band Rejection," in 2020 IEEE International Microwave Symposium (IMS) (Best Paper Award, 2nd Place)
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N. Reiskarimian, M. Khorshidian, and H. Krishnaswamy, "Inductorless, Widely-Tunable N-Path Shekel Circulators Based on Harmonic Engineering" in IEEE Radio Frequency Integrated Circuits Symposium (RFIC), June 2020.
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M. Khorshidian, N. Reiskarimian, and H. Krishnaswamy. "High-Performance Isolators and Notch Filters based on N-Path Passive Negative-Resistance" in IEEE International Solid-State Circuits Conference (ISSCC), February 2020
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M. Khorshidian and H. Krishnaswamy, "A Fully-Integrated 2.6GHz Stacked Switching Power Amplifier in 45nm SOI CMOS with >2W Output Power and 43.5% Efficiency," in 2019 IEEE International Microwave Symposium (IMS)