Frequency Modulation Subsurface Ultrasonic Force Microscopy

Scanning Subsurface Ultrasonic Force Microscopy (SSURFM) relies on a change in the sensing cantilever’s resonance frequency to detect subsurface structures through their mechanical properties. It gains sensitivity both from exploiting the cantilevers large dynamical stiffness at high frequency and from using the sensitivity of the shifting...

A 0.62nJ/b multi-standard WiFi/BLE wideband digital polar TX with dynamic FM correction and AM alias suppression for IoT applications

A WiFi (IEEE 802.11g) and BLE combo transmitter (TX) for IoT applications is presented. A wideband digital polar architecture consisting of an all-digital PLL-based frequency modulator and a switched-capacitor digitally-controlled PA achieves optimal energy efficiency for both WiFi and BLE. The dynamic FM correction and AM alias suppression...

Annoyance caused by low frequency sounds: Spectral and temporal effects

The objective of the present laboratory studies was to enable refinements of the current rating procedure for low frequency sounds. To increase our insight into a relevant spectral issue, groups of adjacent frequency bands around 40, 50, and 63 Hz were presented at various sound level combinations. It was concluded that an energy-based summation...

Respiratory impact on motion sickness induced by linear motion

Motion sickness incidence (MSI) for vertical sinusoidal motion reaches a maximum at 0.167 Hz. Normal breathing frequency is close to this frequency. There is some evidence for synchronization of breathing with this stimulus frequency. If this enforced breathing takes place over a larger frequency range (0.05-0.8 Hz) and whether this contributes...

A multi-channel S-band FMCW radar front-end

This paper describes the design and performance of a low-cost synthesized FMCW radar module, operating in S band. The bi-layer PCB contains a frequency-agile low phase-noise synthesizer and three identical coherent receive-channels. The transmit channel has an automatic power control system that reduces the output power when a large reflection...

S-band sige phase and amplitude control MMIC

This paper presents very recent achievements in the Silicon implementation of phase and amplitude control for active electronically steered arrays. The IC combines 6-bit amplitude control with more than 20 dB amplitude range, including control logic and series-to-parallel converters. The IC is a step forward in lowering active array cost and...

Absolute distance metrology for space interferometers

Space interferometers consisting of several free flying telescopes, such as the planned Darwin mission, require a complex metrology system to make all the components operate as a single instrument. This metrology system consists of various sub-systems to monitor distances, angles and speeds. Our research focuses on one of these sub-systems that...

Validation of the revised STI-r method

The revised model for the speech transmission index (STIr, Speech Communication 28 (1999) 109), was validated with an independent set of 68 test conditions. For a subset of 18 conditions, including only additive noise and band-pass limiting, it was veri.ed that the STIr provides a good prediction of the CVC-word score. The additional...

Photonic chip for steering a four element phased array antenna

A polarization independent photonic integrated circuit for phase steering of a four element phased array antenna has been fabricated on InP. The chip is extremely small and suitable for packaging