Optimization and characterisation of bonding of piezoelectric transducers using anisotropic conductive adhesive

Cummins, Gerard; Gao, J.; Watson, David E.; Desmulliez, Marc Phillipe Yves; McPhillips, Rachael; Cochran, S.

doi:10.1109/ultsym.2017.8092778

Cited by 1 publication

(1 citation statement)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Capacitive micromachined ultrasonic transducers (CMUTs) [ 11 , 12 , 13 ], piezoelectric transducers [ 14 , 15 , 16 ], and electro-neural stimulators [ 17 , 18 , 19 , 20 , 21 ], in particular, need to drive nonlinear capacitive load with a large impedance variation. With such a variable capacitive load, in order to achieve an extremely high-resolution control (e.g., 16-bit resolution) to the extent well beyond the present state-of-the-art, which is typically implemented with less than 6–8-bit resolution [ 22 , 23 , 24 ], the electronic interface circuitry of such transducers requires a precision high-gain operational amplifier.…”

Section: Introductionmentioning

confidence: 99%

A Compact Operational Amplifier with Load-Insensitive Stability Compensation for High-Precision Transducer Interface

Yang

Chung

2018

Sensors

View full text Add to dashboard Cite

High-resolution electronic interface circuits for transducers with nonlinear capacitive impedance need an operational amplifier, which is stable for a wide range of load capacitance. Such operational amplifier in a conventional design requires a large area for compensation capacitors, increasing costs and limiting applications. In order to address this problem, we present a gain-boosted two-stage operational amplifier, whose frequency response compensation capacitor size is insensitive to the load capacitance and also orders of magnitude smaller compared to the conventional Miller-compensation capacitor that often dominates chip area. By exploiting pole-zero cancellation between a gain-boosting stage and the main amplifier stage, the compensation capacitor of the proposed operational amplifier becomes less dependent of load capacitance, so that it can also operate with a wide range of load capacitance. A prototype operational amplifier designed in 0.13-μm complementary metal–oxide–semiconductor (CMOS) with a 400-fF compensation capacitor occupies 900-μm2 chip area and achieves 0.022–2.78-MHz unity gain bandwidth and over 65∘ phase margin with a load capacitance of 0.1–15 nF. The prototype amplifier consumes 7.6 μW from a single 1.0-V supply. For a given compensation capacitor size and a chip area, the prototype design demonstrates the best reported performance trade-off on unity gain bandwidth, maximum stable load capacitance, and power consumption.

show abstract