A5068182835- Radio Frequency Integrated Circuit Design
- Microwave Engineering and Waveguides
- Millimeter-Wave Propagation and Modeling
- Acoustic Wave Resonator Technologies
- Orbital Angular Momentum in Optics
- Quantum and electron transport phenomena
- Semiconductor Quantum Structures and Devices
- Microfluidic and Bio-sensing Technologies
- Energy Harvesting in Wireless Networks
- Superconducting and THz Device Technology
- Metamaterials and Metasurfaces Applications
- Advancements in PLL and VCO Technologies
University of Southern California
2016-2020
N-path circuits, consisting of an array switched capacitors driven with non-overlapping clocks, have been used to create radio frequency bandpass and band-stop filters. This paper covers a synthesizing methodology RF filters (BPFs) that uses multiple passively coupled resonators realize more selective transfer function transmission zeros. Design details measurement results proof-of-concept filter prototype 0.8-1.1-GHz tunable realized in 65-nm CMOS technology are presented.
The front-end of a conventional millimeter-wave receiver (RX) consists bandpass filter (BPF) and low-noise amplifier (LNA) prior to the frequency down-conversion mixer. In interference-limited wireless channels, it is more footprint power efficient remove BPF LNA, realize mixer as "passive" switching scheme. noise figure this passive mixer-first RX improved when numerous such RXs are placed in phased array or multi-input multi-output (MIMO) configuration. can be followed with an on-chip...
We present a short-range experimental orbital-angular-momentum (OAM) multiplexing millimeter-wave communication system using patch antenna arrays. The dependence of the evolution OAM beams on number array elements and radius are analyzed. also find phase delay deviation 30 degrees leads to mode purity degrading ∼1% power 6 dB reduces by <40%. An obstruction size <10mm has not much influence generated from arrays with r = 8mm, which enables stacking multiple use these demonstrate 60 GHz...
Current cellular receivers often employ acoustic filters (SAW or BAW) for each communication band due to their high selectivity, low insertion loss, and small formfactor. The need support multiple bands, multi-input multi-output (MIMO) communications, carrier aggregation necessitates the use of several such with a large overall footprint. These RF high-Q resonators create poles transmission zeros in high-order transfer function achieve loss within nearly flat passband, fast roll-off, highly...
Passive mixer-first receivers have gained interest for their superior linearity, lower power consumption, and smaller footprint. Traditionally, the load of these mixers is a passive or active RC filter. This paper demonstrates receiver where mixer third-order elliptic filter realized using on-chip capacitors spiral inductors so that wide bandwidth high selectivity are concurrently achieved. The 65nm CMOS prototype covers tunable frequency between 21 29 GHz achieves 0.5 instantaneous baseband...
This paper presents an integrated inverted stripline-like tunable transmission line structure where the propagation velocity can be modified as characteristic impedance remains constant. As one application of this structure, a mm-wave phase shifter for massive hybrid MIMO applications is implemented in 45 nm CMOS SOI process. Measurement results at GHz demonstrate 79° shift tuning range, worst-case insertion loss 3.3 dB, and effective area 0.072 mm2. Compared to on-chip reference based on...