Now showing items 1-16 of 16

    • An Integrated Germanium-Based THz Impulse Radiator with an Optical Waveguide Coupled Photoconductive Switch in Silicon 

      Chen, Peiyu; Hosseini, Mostafa; Babakhani, Aydin (2019)
      This paper presents an integrated germanium (Ge)-based THz impulse radiator with an optical waveguide coupled photoconductive switch in a low-cost silicon-on-insulator (SOI) process. This process provides a Ge thin film, which is used as photoconductive material. To generate short THz impulses, N++ implant is added to the Ge thin film to reduce its ...
    • Electron paramagnetic resonance (EPR) systems with active cancellation 

      Babakhani, Aydin; Yang, Xuebei (2020-05-26)
      An active cancellation system may be utilized to cancel interference, such as from transmitter leakage or self-interference in a transceiver of an electron paramagnetic resonance (EPR) spectrometer. The active cancellation system may be inserted between the transmitter and receiver. The active cancellation system may receive the output of the ...
    • Electron spin resonance for medical imaging 

      Yang, Xuebei; Chen, Charles; Seifi, Payam; Babakhani, Aydin (2018-01-02)
      A method includes generating, from an integrated oscillator circuit, an oscillating output signal and generating, by an integrated power amplifier (PA) circuit, an amplified oscillating output signal based on the oscillating output signal. The method further includes receiving, by integrated receiver amplifier circuit, an electron spin resonance (ESR) ...
    • EPR systems for flow assurance and logging 

      Babakhani, Aydin; Yang, Xuebei (2019-09-10)
      An Electron Paramagnetic resonance (EPR) system and method allows the measurement paramagnetic characteristics of materials in real-time, such as heavy oil, hydrocarbons, asphaltenes, heptane, vanadium, resins, drilling fluid, mud, wax deposits or the like. The EPR systems and methods discussed herein are low cost, small and light weight, making them ...
    • Fully programmable digital-to-impulse radiating array 

      Assefzadeh, Mohammad Mahdi; Babakhani, Aydin (2019-02-19)
      A fully-programmable digital-to-impulse radiator with a programmable delay is discussed herein. The impulse radiator may be part of an array of impulse radiators. Each individual element of the array may be equipped with an integrated programmable delay that can shift the timing of a digital trigger. The digital trigger may be fed to an amplifier, ...
    • High efficiency carbon nanotube thread antennas 

      Bengio, E. Amram; Senic, Damir; Taylor, Lauren W.; Tsentalovich, Dmitri E.; Chen, Peiyu; (2017)
      Although previous research has explored the underlying theory of high-frequency behavior of carbon nanotubes (CNTs) and CNT bundles for antennas, there is a gap in the literature for direct experimental measurements of radiation efficiency. These measurements are crucial for any practical application of CNT materials in wireless communication. In ...
    • Impulse sampler architecture and active clock cancellation architecture 

      Aggrawal, Himanshu; Babakhani, Aydin (2019-02-12)
      A novel nonlinear impulse sampler is presented that provides a clock sharpening circuit, sampling stage, and post-sampling block. The clock sharpening circuit sharpens the incoming clock while acting as a buffer, and the sharpened clock is fed to the input of the sampling stage. The impulse sampling stage has two main transistors, where one transistor ...
    • Intergrated electron spin resonance spectrometer 

      Yang, Xuebei; Chen, Charles; Seifi, Payam; Babakhani, Aydin (2017-06-27)
      An integrated electron spin resonance (ESR) circuit chip includes a chip substrate, a transmitter circuit, and a receiver circuit. The transmitter circuit and receiver circuit are disposed on the chip substrate. The transmitter circuit includes an oscillator circuit configured to generate an oscillating output signal and a power amplifier (PA) circuit ...
    • Methods and related systems of ultra-short pulse detection 

      Babakhani, Aydin; Jamali, Babak (2019-01-29)
      Ultra-short pulse detection. At least some example embodiments are methods including: receiving by an antenna a series of ultra-short pulses of electromagnetic energy at a repetition frequency, the receiving creates a pulse signal; self-mixing or intermodulating the pulse signal by applying the pulse signal to a non-linear electrical device, thereby ...
    • Miniaturized direct digital-to-impulse radar sensors in silicon 

      Assefzadeh, Mahdi M.; Babakhani, Aydin (2019-03-05)
      A radar system may comprise a trigger, driver, switching circuit, and antenna for generating an ultra-short impulse without utilizing an oscillator. A radar imaging system for imaging a formation or a cross section of a pipeline may include at least one radar sensor. The system may transmit a high-frequency, short impulse signal to a formation or ...
    • Modulation-Doped Multiple Quantum Wells of Aligned Single-Wall Carbon Nanotubes 

      Komatsu, Natsumi; Gao, Weilu; Chen, Peiyu; Guo, Cheng; Babakhani, Aydin; (2017)
      Heterojunctions, quantum wells, and superlattices with precise doping profiles are behind today's electronic and photonic devices based on III–V compound semiconductors such as GaAs. Currently, there is considerable interest in constructing similar artificial 3D architectures with tailored electrical and optical properties by using van der Waals ...
    • Systems and methods for active cancellation for improving isolation of transmission gates in high-frequency analog to digital converters 

      Aggrawal, Himanshu; Babakhani, Aydin (2016-01-26)
      An active cancellation system may provide a first and second transmission gates that are fed with an input signal and a complimentary signal, respectively. The first transmission gate may be switched on/off, and a second transmission gate may remain off at all times. When switched off, the first transmission gate may provide a leakage signal resulting ...
    • Systems and methods for fracture mapping via frequency-changing integrated chips 

      Babakhani, Aydin (2019-09-24)
      Systems and methods for fracture mapping may utilize frequency changing to aid in providing high-resolution mapping. Integrated chips may be injected into a well and dispersed into a formation. A downhole tool that provides a transmitter and receiver may be positioned in the well. The transmitter may transmit electromagnetic (EM) signals into the ...
    • Systems and methods for fracture mapping via frequency-changing integrated chips 

      Babakhani, Aydin (2020-06-23)
      Systems and methods for fracture mapping may utilize frequency changing to aid in providing high-resolution mapping. Integrated chips may be injected into a well and dispersed into a formation. A downhole tool that provides a transmitter and receiver may be positioned in the well. The transmitter may transmit electromagnetic (EM) signals into the ...
    • Systems and methods for monitoring cement quality in a cased well environment with integrated chips 

      Babakhani, Aydin (2020-01-07)
      A well monitoring system may provide a plurality of integrated chips dispersed in cement surrounding a well casing. Each of the integrated chips may provide energy harvesting circuitry, EM transceiver, modulator, additional sensor(s), processor or microprocessor, memory, power source, or the like. Upon analyzing data gather from the sensor(s), emitted ...
    • Wireless synchronization of mm-wave arrays 

      Chen, Charles; Babakhani, Aydin (2018-10-23)
      Systems and methods providing wireless synchronization of wave arrays may include an antenna that receives a wireless injection signal and another antenna that radiates a locked wave signal corresponding to the injection signal. In some embodiments, these systems may also provide a low noise amplifier, voltage controlled oscillator (VCO), buffer ...