Improving CMUT receiving sensitivity using parametric amplification

Author

You, Wei ; Cretu, Edmond ; Rohling, Robert

Author_Institution

Dept. Electr. & Comput. Eng., Univ. of British Columbia, Vancouver, BC, Canada

fYear

2011

fDate

18-21 Oct. 2011

Firstpage

588

Lastpage

591

Abstract

This paper presents a signal controlling method for improving the receiving sensitivity of CMUTs using the concept of parametric amplification. An extra AC pumping voltage at twice the frequency of the incoming acoustic signal is superimposed on the conventional DC receiving bias. Finite element analysis and numerical simulation show at least a 7dB improvement for a single CMUT in an infinite medium in response to a sinusoidal acoustic source. The level of amplification is sensitive to the phase angle and the amplitude of the pumping voltage. Improvement is also shown for a pulsed acoustic source and low Q factor CMUTs.

Keywords

Q-factor; acoustic radiators; acoustic signal processing; amplification; finite element analysis; numerical analysis; ultrasonic transducers; AC pumping voltage; CMUT receiving sensitivity; DC receiving bias; acoustic signal superimposition; capacitive micromachined ultrasonic transducers; finite element analysis; low Q factor CMUT; numerical simulation; parametric amplification; phase angle; pulsed acoustic source; pumping voltage amplitude; signal controlling method; sinusoidal acoustic source; Acoustics; Computational modeling; Finite element methods; Frequency response; Integrated circuit modeling; Numerical models; Sensitivity; CMUTs; parametric amplification; receiving sensitivity;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium (IUS), 2011 IEEE International

Conference_Location

Orlando, FL

ISSN

1948-5719

Print_ISBN

978-1-4577-1253-1

Type

conf

DOI

10.1109/ULTSYM.2011.0142

Filename

6293395