Now showing items 141-146 of 146
Microfabricated ultrasonic transducers: towards robust models and immersion devices
The successful fabrication of ultrasonic immersion transducers is reported. Transducers are observed to operate from 1 MHz to 20 MHz in water, with the frequency range limited by electronics, not the transducers. Transmission ...
A VLSI receive beamformer for digital ultrasound imaging
A VLSI architecture for real-time digital receive beamforming in phased array ultrasound imaging is proposed. The architecture is an inverse binary tree like structure with N stages where N is the number of array elements. ...
High throughput, high resolution scanning probe microscopy
(Technology Publishing Ltd., 1998)
Mic-in-CMOS: CMUT as a sealed-gap capacitive microphone
The design and production of a CMOS compatible, watertight and ingress-proof CMUT (capacitive micromachined ultrasonic transducer) microphone, mic-in-CMOS, with vacuum-gap is described. We present an analytical ...
Accurate and process-tolerant resistive load
Resistive terminations cannot preserve high-quality matching at high frequencies due to the parasitic effects of the nonideal resistor. Moreover, resistance values of the termination resistors in integrated circuits are ...
High-Intensity airborne CMUT transmitter array with beam steering
A 2×2 high-intensity CMUT transmit array that is capable of two-dimensional beam steering is presented. The device uses an ac drive voltage at half the ultrasound frequency without any dc bias, enabling the usage of the ...