Design and cryogenic operation of an intermediate frequency (IF) low noise amplifier using a 0.15-µm InGaAs mHEMT process for Atacama Large Millimeter/Submillimeter Array (ALMA) is presented in this paper. The amplifier covers 4–12 GHz with small signal gain of 27±2 dB and effective noise temperature of 18–25 K when operating at… (More)
a W-band subharmonically pumped (SHP) diode mixer module is designed, fabricated and tested for broadband astronomical applications. The packaged module performance is measured and compared under room-temperature and cryogenic environment. In summary, compared to the room-temperature performance, when the SHP diode mixer is operated under cryogenic… (More)
A simple E-plane waveguide-to-microstrip transition probe on quartz substrate is designed. Instead of using cascaded microstrip sections as impedance transformer, the transition probe adopting the structure analogous to monopole antenna with sleeve features a compact structure and tunable bandwidth. The sleeve contributes an additional resonant mode to… (More)
We demonstrate an in vivo transmission T-ray mammography for early breast cancer detection in an animal model. Compared to the state-of-the-art sensitivity of X-ray mammography (Volume: 4.22mm<sup>3</sup>), T-ray achieved much earlier cancer detection (Volume: 0.5mm<sup>3</sup>).
A phase-locked broadband GaAs HBT voltage controlled oscillator module is designed, fabricated and tested for the local oscillators in millimetre-wave astronomical heterodyne receivers. The configuration of the local oscillator module is based on the offset phase-locked loop scheme with frequency dividing circuit in the feedback path. Employing closed-loop… (More)
This session explores different architectures, fabrics, and interconnect structures for signal processing and computing. These structures range from general purpose, domain specific, to application specific. These papers consider power, throughput, and flexibility trade-offs.
A near-field phasor beam measurement system is developed for the characterization of heterodyne receiver optics at submillimeter-wave frequencies. The system synthesizes a pair of submillimeter-wave signals as the RF and local oscillator (LO) sources from common reference sources. The synthesized harmonic numbers of the RF and LO sources are arranged with… (More)