Levent Degertekin

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—This paper describes a low-power approach to capac-itive sensing that achieves a high signal-to-noise ratio (SNR). The circuit is composed of a capacitive feedback charge amplifier and a charge adaptation circuit. Without the adaptation circuit, the charge amplifier only consumes 1 W to achieve the audio band SNR of 69.34 dB. An adaptation scheme using(More)
We designed and fabricated a dynamic receive beamformer integrated circuit (IC) in 0.35-μm CMOS technology. This beamformer IC is suitable for integration with an annular array transducer for high-frequency (30-50 MHz) intravascular ultrasound (IVUS) imaging. The beamformer IC consists of receive preamplifiers, an analog dynamic delay-and-sum beamformer,(More)
  • H. Jagannathan, G. G. Yaralioglu, A. S. Ergun, F. L. Degertekin, and B. T. Khuri-Yakub
  • 2002
to integrate ultrasonic sensors in micro-fluidic channels. We have developed a system with fluidic channels having embedded zinc oxide transducers. A zinc oxide film is deposited on a glass substrate and is sandwiched between two electrodes. The transducers made are found to resonate at 400 MHz in thickness mode. The channels are made both from PDMS using a(More)
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