Picosecond Digital-to-Impulse (D2i) Radiators in Silicon
Master of Science
Current techniques for terahertz (THz) time-domain spectroscopy (TDS) are based on femtosecond lasers and photoconductive antennas (PCAs). The PCA is the emitter and the detector of THz pulses and includes a THz antenna which is fabricated on a high mobility semiconductor substrate. THz-TDS techniques are used for 3D imaging and non-destructive evaluation of materials in pharmaceutical, medical and security applications. There are a number of limitations with current THz-TDS systems. Femtosecond lasers are expensive and bulky with high power consumption. They also require optical alignments. The delay line and object scanning are performed mechanically. The repetition rate and the radiated power are also limited. A single-chip impulse radiator in silicon can overcome these limitations. It is a high yield and low cost solution and can provide repetition rates of up to 10 GHz. A low power digital trigger is needed instead of an optical pump, without requiring lasers or optical alignments. In this work, direct digital-to-impulse (D2i) radiators are implemented in silicon technologies that can radiate sub-10psec impulses with on-chip antennas. System architecture, broadband phase-linear antenna design, circuit techniques, simulations and measurement results are discussed in this thesis. Also a full-system on-chip 4 by 4 array of D2i radiators are fabricated in silicon that provide beam-steering and spatial coherent combining of impulses.
BiCMOS digital integrated circuits; Ge-Si alloys; bow-tie antennas; broadband antennas; frequency stability; More... slot antennas; timing jitter; BiCMOS process; EIRP digital-to-impulse radiator; SiGe; coherent impulses; direct digital-to-impulse transmitter; frequency 10 Hz; frequency 220 GHz; frequency stability; on-chip slot bow-tie antenna; radiated impulse; size 130 nm; timing jitter; Antenna measurements; BiCMOS integrated circuits; Current measurement; Indexes; Three-dimensional displays; Time-frequency analysis; BiCMOS; Coherent Spatial Combining; Direct Digital-to-Impulse Radiator; Picosecond Impulse Radiation; SiGe; Slot Bow-Tie Antenna Less...
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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 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, ...