A High-Voltage DAC-Based Transmitter for Coded Signals in High Frequency Ultrasound Imaging Applications

作者：Ku Po Chih^*; Shih Kuan Yu; Lu Liang Hung

来源：IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS, 2018, 65(9): 2797-2809.

DOI：10.1109/TCSI.2018.2817634

• Digital-to-analog converter (DAC)
• SFDR
• high-voltage and high-speed transmitter
• transducer
• high frequency ultrasound imaging
• coded signals
• peak sidelobe (PSL)

An ultrasound transmitter based on a high-voltage digital-to-analog converter (HVDAC) is presented in this paper. The transmitter is implemented in a 0.25-mu m high-voltage CMOS process provided by foundry, integrating the digital control circuitry and HVDAC on a single chip. By employing a fastslewing DAC in conjunction with a standard DAC, the proposed circuit is optimized for high-speed operations even for a load with large capacitance, making it well suited for applications where piezoelectric transducers are utilized. With an output loading of 180 pF // 50 Omega, the HVDAC operates at a sampling rate of 150 MS/s, while providing a maximum output swing of 31.5 VPP. The spurious-free dynamic range is 46 dB at 1-MHz output frequency and 31 dB at Nyquist frequency, which is analyzed in detailed and proved in good agreement with the measurement results. Tested with a chirp signal sweeping from 15.75 to 34.25 MHz in 2-mu s and a transducer model centered at 25 MHz with a 13.75-MHz bandwidth, the compressed pulse after matched filtering shows a -6-dB pulse width of 153 ns with a peak sidelobe of -40 dB, which successfully demonstrates the capability for coded signals excitation at high frequency.

• 出版日期2018-9
• 单位中国科学院电工研究所