High-voltage integrated transmitting circuit with differential driving for CMUTs

This paper presents a high-voltage integrated regulator capable of sinking current for driving pulse-triggered level shifters in drivers for ultrasound applications. The regulator utilizes a new topology with a feedback loop and a current sinking circuit to satisfy the requirements of the portable ultrasound scanner: a great driving strength in the scanner's transducer and a low undershoot voltage in the output node. The design regulates an output voltage of 45 V from an input voltage of 50 V, and it can sink currents up to 100 mA using no external components with only 340 mV of undershoot voltage. The proposed design has been implemented in high-voltage 0.18 µm process whithin an area of 0.11 mm 2 and it is suitable for system-on-chip integration due to its low component count and the fully integrated design.

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High-voltage integrated linear regulator with current sinking capabilities for portable ultrasound scanners

Pausas

Muntal

Jørgensen

2017

2017 IEEE Nordic Circuits and Systems Conference (NORCAS): NORCHIP and International Symposium of System-on-Chip (SoC)

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Transmitting performance evaluation of ASICs for CMUT-based portable ultrasound scanners

Muntal

Diederichsen

Jørgensen

et al. 2017

2017 IEEE International Ultrasonics Symposium (IUS)

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Abstract-Portable ultrasound scanners (PUS) have, in recent years, raised a lot of attention, as they can potentially overcome some of the limitations of static scanners. However, PUS have a lot of design limitations including size and power consumption. These restrictions can compromise the image quality of the scanner. In order to overcome these restrictions, application specific integrated circuits (ASICs) are needed to implement the electronics. In this work, a comparative study of the transmitting performance of a capacitive micromachined ultrasonic transducer (CMUT) driven by a commercial generic ultrasound transmitter and an ASIC optimized for CMUT-based PUS is presented. A single CMUT element is pulsed with a 1% duty cycle at a frequency of 5 MHz. The DC bias voltage is 80 V and the pulsing voltage is 20 V. The acoustic performance is assessed by comparing the ultrasonic signals measured with a hydrophone both in the time and frequency domains. The difference in normalized signal amplitude evaluated at the center frequency of the CMUT is −1.9 dB and the measured bandwidth is equivalent. The ASIC consumes only 1.3% of the total power consumption used by the commercial transmitter.

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High-voltage integrated transmitting circuit with differential driving for CMUTs

Cited by 2 publications

References 13 publications

High-voltage integrated linear regulator with current sinking capabilities for portable ultrasound scanners

High-voltage integrated linear regulator with current sinking capabilities for portable ultrasound scanners

Transmitting performance evaluation of ASICs for CMUT-based portable ultrasound scanners

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