Abstract
This work presents a compact ADC architecture capable of digitizing the
signals received by every individual element of a 2D ultrasound
transducer array. An element-matched layout of 150 μm × 150 μm is
realized by exploiting each piezo-electric transducer element not only
as the signal source, but also as the electro-mechanical loop-filter of a
continuoustime band-pass ΔΣ ADC, thus minimizing the required circuit
blocks. The transducer's frequency response, which is inherently matched
with the signal bandwidth of interest, provides noise shaping to the
ADC. A prototype chip has been fabricated in a 0.18 μm CMOS technology,
featuring 20 ADCs located directly underneath a 150 μm-pitch
piezo-electric transducer array fabricated on top of the chip. Each ADC,
clocked at 200 MHz, consumes 800 μψ from a 1.8 V supply, and achieves
an SNR of 47 dB in a 75% bandwidth around a center frequency of 5 MHz.
Acoustic measurements show that the ADC successfully digitizes incoming
echo signals.
Original language | English |
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Title of host publication | 2017 IEEE Asian Solid-State Circuits Conference (A-SSCC)) |
Subtitle of host publication | Proceedings of Technical Papers |
Place of Publication | Danvers, MA |
Publisher | IEEE |
Pages | 137-140 |
Number of pages | 4 |
ISBN (Electronic) | 978-1-5386-3178-2 |
DOIs | |
Publication status | Published - 2017 |
Event | A-SSCC 2017: 13th annual IEEE Asian Solid-State Circuits Conference - Grand Hilton Hotel, Seoul, Korea, Republic of Duration: 6 Nov 2017 → 8 Nov 2017 Conference number: 13 http://www.asscc.org/ |
Conference
Conference | A-SSCC 2017 |
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Country/Territory | Korea, Republic of |
City | Seoul |
Period | 6/11/17 → 8/11/17 |
Internet address |
Keywords
- Band-pass ADC
- Electro-mechanical Resonator
- Tracking Quantizer
- Inverter-based OTA