22,217 research outputs found
Energy-efficient acceleration of MPEG-4 compression tools
We propose novel hardware accelerator architectures for the most computationally demanding algorithms of the MPEG-4 video compression standard-motion estimation, binary motion estimation (for shape coding), and the forward/inverse discrete cosine transforms (incorporating shape adaptive modes). These accelerators have been designed using general low-energy design philosophies at the algorithmic/architectural abstraction levels. The themes of these philosophies are avoiding waste and trading area/performance for power and energy gains. Each core has been synthesised targeting TSMC 0.09
μm TCBN90LP technology, and the experimental results presented in this paper show that the proposed cores improve upon the prior art
Design Considerations of a Sub-50 {\mu}W Receiver Front-end for Implantable Devices in MedRadio Band
Emerging health-monitor applications, such as information transmission
through multi-channel neural implants, image and video communication from
inside the body etc., calls for ultra-low active power (<50W) high
data-rate, energy-scalable, highly energy-efficient (pJ/bit) radios. Previous
literature has strongly focused on low average power duty-cycled radios or low
power but low-date radios. In this paper, we investigate power performance
trade-off of each front-end component in a conventional radio including active
matching, down-conversion and RF/IF amplification and prioritize them based on
highest performance/energy metric. The analysis reveals 50 active
matching and RF gain is prohibitive for 50W power-budget. A mixer-first
architecture with an N-path mixer and a self-biased inverter based baseband
LNA, designed in TSMC 65nm technology show that sub 50W performance can
be achieved up to 10Mbps (< 5pJ/b) with OOK modulation.Comment: Accepted to appear on International Conference on VLSI Design 2018
(VLSID
Research on a non-destructive fluidic storage control device
Fluidic memory device with associated fluidic alpha numerical displa
Quantum sensing
"Quantum sensing" describes the use of a quantum system, quantum properties
or quantum phenomena to perform a measurement of a physical quantity.
Historical examples of quantum sensors include magnetometers based on
superconducting quantum interference devices and atomic vapors, or atomic
clocks. More recently, quantum sensing has become a distinct and rapidly
growing branch of research within the area of quantum science and technology,
with the most common platforms being spin qubits, trapped ions and flux qubits.
The field is expected to provide new opportunities - especially with regard to
high sensitivity and precision - in applied physics and other areas of science.
In this review, we provide an introduction to the basic principles, methods and
concepts of quantum sensing from the viewpoint of the interested
experimentalist.Comment: 45 pages, 13 figures. Submitted to Rev. Mod. Phy
Recommended from our members
A RISC-V Vector Processor With Simultaneous-Switching Switched-Capacitor DC-DC Converters in 28 nm FDSOI
This work demonstrates a RISC-V vector microprocessor implemented in 28 nm FDSOI with fully integrated simultaneous-switching switched-capacitor DC-DC (SC DC-DC) converters and adaptive clocking that generates four on-chip voltages between 0.45 and 1 V using only 1.0 V core and 1.8 V IO voltage inputs. The converters achieve high efficiency at the system level by switching simultaneously to avoid charge-sharing losses and by using an adaptive clock to maximize performance for the resulting voltage ripple. Details about the implementation of the DC-DC switches, DC-DC controller, and adaptive clock are provided, and the sources of conversion loss are analyzed based on measured results. This system pushes the capabilities of dynamic voltage scaling by enabling fast transitions (20 ns), simple packaging (no off-chip passives), low area overhead (16%), high conversion efficiency (80%-86%), and high energy efficiency (26.2 DP GFLOPS/W) for mobile devices
A software controlled voltage tuning system using multi-purpose ring oscillators
This paper presents a novel software driven voltage tuning method that
utilises multi-purpose Ring Oscillators (ROs) to provide process variation and
environment sensitive energy reductions. The proposed technique enables voltage
tuning based on the observed frequency of the ROs, taken as a representation of
the device speed and used to estimate a safe minimum operating voltage at a
given core frequency. A conservative linear relationship between RO frequency
and silicon speed is used to approximate the critical path of the processor.
Using a multi-purpose RO not specifically implemented for critical path
characterisation is a unique approach to voltage tuning. The parameters
governing the relationship between RO and silicon speed are obtained through
the testing of a sample of processors from different wafer regions. These
parameters can then be used on all devices of that model. The tuning method and
software control framework is demonstrated on a sample of XMOS XS1-U8A-64
embedded microprocessors, yielding a dynamic power saving of up to 25% with no
performance reduction and no negative impact on the real-time constraints of
the embedded software running on the processor
- …