[7] [7] KIM I,KIM H,GRIGGIO F, et al.CMOS ultrasound transceiver chip for high-resolution ultrasonic imaging systems［J］. IEEE Transactions on Biomedical Circuits and Systems,2009(3): 293-303.

[8] [8] WILD J J,REID J M. Application of echo-ranging techniques to the determination of structure of biological tissues［J］. Science,1952,115(2983):226-230.

[9] [9] TAlMAN J R,GARVERICK S L,LOCKWOOD G R. Integrated circuit for high-frequency ultrasound annular array［C］//San Jose,CA,USA: Proceedings of the IEEE 2003 Custom Integrated Circuits Conference,2003:477-480.

[10] [10] HASSANB A. Low-cost digital ultrasound beamformer design using field programmable gate arrays［D］.Cairo:Cairo University,2012.

[11] [11] DUSA C,KALALII S,PACHAMUTHU R,et al.Integrated 16-channel transmit and receive beamforming ASIC for ultrasound imaging［C］//Bangalore,India:2015 28th International Conference on VLSI Design,2015:215-220.

[12] [12] HU C H,SNOOK K A,CAO P J,et al.High-frequency ultrasound annular array imaging. Part II: digital beamformer design and imaging［J］. IEEE Trans UltrasonFerroelectr Freq Control,2006,53(2):309-316.

[19] [19] HUANG J M,CHEN Z,GUO H,et al. FPGA implementation of a novel type DDS based on CORDIC algorithm［J］. Advances in Intelligent & Soft Computing, 2011,105:183-188.

[20] [20] D’AMATO G, AVITABILE G, COVIELLO G,et al. A beam steering unit for active phased-array antennas based on FPGA synthesized delay-lines and PLLs［C］//Turkey:2015 International Conference on Synthesis, Modeling, Analysis and Simulation Methods and Applications to Circuit Design (SMACD), 2015: 1-4.

[22] [22] FAN Yuhang,ZHANG Xuewu,XU Xiaolong,et al.Design of underwater high-precision ultrasonic phased array transmitting system［C］//Dalian,China:2017 International Conference on Computer Systems,Electronics and Control (ICCSEC),2017:1549-1552.

[23] [23] SMITHP R,COWELL D M J,RAITON B,et al. A PLL-based phased array method to minimize phase quantization errors and reduce phasing-lobes［J］.IEEE International Ultrasonics Symposium,2010:1837-1840.

[25] [25] MAJ, KARADAYI K, ALI M, et al.Ultrasound phase rotation beamforming on multi-core DSP［J］. Ultrasonics,2014,54(1):99-105.

[26] [26] ALMEKKAWY M, XU Jingwei, CHIRALA M. An optimized ultrasound digital beamformer with dynamic focusing implemented on FPGA［C］//Chicago, Illinois: 2014 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2014:3296-3299.

[29] [29] LIU Peilu,LI Xinghua,LI Haopeng,et al. Implementation of high time delay accuracy of ultrasonic phased array based on interpolation CIC filter［J］. Sensors,2017,17(10):2322.

[30] [30] TANG Wenming, LIU Guixiong,LIN Ruobo.Design of polyphase cascaded integrator comb interpolator filter for ultrasonic phased array time delays［J］.International Journal of Engineering and Technology,2017,9:304-309.