Title :
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
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;
Conference_Titel :
Ultrasonics Symposium (IUS), 2011 IEEE International
Conference_Location :
Orlando, FL
Print_ISBN :
978-1-4577-1253-1
DOI :
10.1109/ULTSYM.2011.0142
