Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

Sorted by: relevance · author · university · dateNew search

You searched for subject:(Impulse radiator). Showing records 1 – 2 of 2 total matches.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


Rice University

1. Chen, Peiyu. High-resolution Millimeter-wave Impulse-based MIMO 3D Imaging Radar in Silicon.

Degree: MS, Engineering, 2015, Rice University

The research on millimeter-wave (mm-wave) silicon-based integrated 3D imaging radar has gained tremendous attention in academia over the past decade. Compared with conventional 2D imaging, 3D imaging captures both 1D depth information and 2D intensity maps. Impulse-based 3D imaging radar can also obtains more constitutional information of objects, like spectroscopy, so as to potentially have material identification functionality with 3D imaging simultaneously. The main objectives in the roadmapping of silicon integrated 3D imaging radar are higher image resolution, a larger image range and shorter acquisition time. With the dramatically improved performance of silicon transistors, mm-wave circuits using CMOS and BiCMOS technologies can generate picosecond-level impulses but with small RF power. Shorter impulses provide higher image resolution, but small RF power limits image range. Spatially coherent impulse combining from multiple silicon circuits is the solution to this problem. Compared with narrow-band phased-arrays that perform only 2D spatial filtering and have range-ambiguity problems, impulse-radiating arrays are capable of performing 3D spatial filtering that enhances the imaging sensitivity of a certain point in 3D space without sacrificing image resolution. Therefore, impulse-based MIMO imaging radar can achieve both high resolution and a large image range simultaneously. In this present work, a 60ps impulse radiator with an on-chip antenna is implemented in the IBM 130nm SiGe BiCMOS process technology. The impulse radiator is the core element of the synthetic arrays that are used to perform 3D imaging in this thesis. A pulsed-VCO-based architecture is designed based on an asymmetric cross-coupled pulsed VCO to convert a digital input signal to radiated impulses. The deliberate asymmetry in the pulsed VCO is introduced to minimize the timing jitter of the radiated impulses in order to achieve spatially coherent impulse combining with high efficiency. The radiated impulses have a record RMS jitter of 178fs with 64 averaging when the input trigger signal has a RMS jitter of 150fs. Two widely spaced impulse radiators are used to perform spatially coherent impulse combining with an efficiency of 98.7%. As the first step in demonstrating impulse-based MIMO 3D imaging radar, in this work, custom synthetic array imaging systems were built based on the proposed silicon-based integrated impulse radiator. 3D imaging of metallic and dielectric objects (rocks immersed in oil) have been performed successfully. A depth accuracy of 27um, a depth resolution of 9mm and a lateral resolution of 8mm at 10cm distance in the air have been achieved. To the author’s knowledge, this work demonstrates the first high-resolution 3D images that are generated by using synthetic array imaging systems based on a fully-integrated impulse radiator in silicon. Future work includes implementing fully integrated impulse transceivers and fully integrated impulse-based MIMO 3D imaging radar with independent time-delay controls. Advisors/Committee Members: Babakhani, Aydin (advisor), Aazhang, Behnaam (committee member), Knightly, Edward W (committee member), Kono, Junichiro (committee member).

Subjects/Keywords: 3D imaging; BiCMOS; Impulse radiator

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Chen, P. (2015). High-resolution Millimeter-wave Impulse-based MIMO 3D Imaging Radar in Silicon. (Masters Thesis). Rice University. Retrieved from http://hdl.handle.net/1911/95203

Chicago Manual of Style (16th Edition):

Chen, Peiyu. “High-resolution Millimeter-wave Impulse-based MIMO 3D Imaging Radar in Silicon.” 2015. Masters Thesis, Rice University. Accessed October 14, 2019. http://hdl.handle.net/1911/95203.

MLA Handbook (7th Edition):

Chen, Peiyu. “High-resolution Millimeter-wave Impulse-based MIMO 3D Imaging Radar in Silicon.” 2015. Web. 14 Oct 2019.

Vancouver:

Chen P. High-resolution Millimeter-wave Impulse-based MIMO 3D Imaging Radar in Silicon. [Internet] [Masters thesis]. Rice University; 2015. [cited 2019 Oct 14]. Available from: http://hdl.handle.net/1911/95203.

Council of Science Editors:

Chen P. High-resolution Millimeter-wave Impulse-based MIMO 3D Imaging Radar in Silicon. [Masters Thesis]. Rice University; 2015. Available from: http://hdl.handle.net/1911/95203


Rice University

2. Assefzadeh, Mahdi. Picosecond Digital-to-Impulse (D2i) Radiators in Silicon.

Degree: MS, Engineering, 2014, Rice University

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. Advisors/Committee Members: Babakhani, Aydin (advisor), Kono, Junichiro (committee member), Mittleman, Daniel M (committee member).

Subjects/Keywords: BiCMOS digital integrated circuits; Ge-Si alloys; bow-tie antennas; broadband antennas; frequency stability; 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

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Assefzadeh, M. (2014). Picosecond Digital-to-Impulse (D2i) Radiators in Silicon. (Masters Thesis). Rice University. Retrieved from http://hdl.handle.net/1911/87707

Chicago Manual of Style (16th Edition):

Assefzadeh, Mahdi. “Picosecond Digital-to-Impulse (D2i) Radiators in Silicon.” 2014. Masters Thesis, Rice University. Accessed October 14, 2019. http://hdl.handle.net/1911/87707.

MLA Handbook (7th Edition):

Assefzadeh, Mahdi. “Picosecond Digital-to-Impulse (D2i) Radiators in Silicon.” 2014. Web. 14 Oct 2019.

Vancouver:

Assefzadeh M. Picosecond Digital-to-Impulse (D2i) Radiators in Silicon. [Internet] [Masters thesis]. Rice University; 2014. [cited 2019 Oct 14]. Available from: http://hdl.handle.net/1911/87707.

Council of Science Editors:

Assefzadeh M. Picosecond Digital-to-Impulse (D2i) Radiators in Silicon. [Masters Thesis]. Rice University; 2014. Available from: http://hdl.handle.net/1911/87707

.