The Design of NCO Built in Ultra High-Speed Data Converter

Zhu, Zehua; Quan, Haiyang; Tian, Ling; Zhang, Tieliang; Peng, Xinmang; Zhang, Lei

doi:10.1109/icet49382.2020.9119568

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…The essence is to approximate the desired rotation Angle by constantly adding and subtracting the positive and negative directions through a fixed angle [4,5]. It can make proper rotation and orientation operations without complex mathematical operations such as trigonometric function table, multiplication, square root, and inverse trigonometric function, and reduce the difficulty of hardware implementation [6]. CORDIC algorithm has developed rapidly, and is improving towards the trend of high base, high precision and high throughput [7].…”

Section: Introductionmentioning

confidence: 99%

The Processing Method of Wrist Radial Artery Ultrasonic Signal Based on CORDIC Algorithm

Zhang,

Geng,

Zhang

et al. 2023

Fuzzy Systems and Data Mining IX

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The human wrist radial artery is rich in important physiological and pathological information. The rapid dynamic detection of radial artery can be realized by ultrasonic imaging method. Because of the small amplitude fluctuation and narrow vessel width of the wrist radial artery, it is difficult to detect the vessels by ultrasound. In ultrasonic nondestructive testing system, CORDIC algorithm can realize complex operation only through simple addition, subtraction and shift transformation. It has obvious advantages in high-speed operation, especially suitable for optimizing ultrasonic signal processing algorithm. Based on CORDIC algorithm, this paper proposes a phased array ultrasonic signal processing method for wrist radial artery. The dynamic filtering, orthogonal demodulation and logarithmic compression techniques using CORDIC algorithm are mainly studied. FPGA simulation results show that CORDIC algorithm can realize the rapid reproduction of the wrist radial artery ultrasonic echo signal, which lays the foundation for the next step of the interpretation of the physiological and pathological information on the radial artery.

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Section: Introductionmentioning

confidence: 99%

The Processing Method of Wrist Radial Artery Ultrasonic Signal Based on CORDIC Algorithm

Zhang,

Geng,

Zhang

et al. 2023

Fuzzy Systems and Data Mining IX

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“…Moreover, the addition of individual analog devices (e.g., mixer and filter) further increases the power consumption and cost of the system. In the case of digital demodulation, the popular way to generate the LO signal is using the numerically controlled oscillator based on direct digital synthesis (DDS) [15,16]. Currently, a look-up table-based DDS has the problems of relatively large signal spurious and low output frequency range.…”

Section: Introductionmentioning

confidence: 99%

BPSK Modulation‐Based Local Oscillator‐Free IQ Demodulation for Millimeter Wave Imaging

et al. 2021

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The precision of local oscillator (LO) signal in in-phase and quadrature (IQ) demodulation strongly affects the imaging performance of millimeter wave (mmWave) radars. Therefore, to eliminate the requirement for high-precision LO, a simple yet effective digital IQ demodulation method has been proposed with the aid of a specified sampling scheme in order to eliminate the demand for LO. Based on the bandpass sampling theorem, the characteristic of the intermediate frequency signal of mmWave imaging indicates that the LO is unrequired if the sampling rate is twice of the frequency of the carrier of the intermediate signal. In this way, the in-phase signal would be directly and accurately obtained by performing the Binary-Phase-Shift-Keying (BPSK) modulation on the samples, based on which the IQ demodulation would be completed by using the Hilbert transform. The proposed method does not employ LO and thus simplifies the demodulation process and is suitable for implementation in a Field-Programmable Gate Array (FPGA) with fewer hardware resources. To verify the method, a three-dimensional mmWave radar imaging is carried out at the 30-34 GHz bandwidth, where the sampling and digital IQ demodulation are realized by an ADC (AD9250) and FPGA (XC7K325T), respectively. The results show a simplified transceiver with lower requirements and the prospect of the proposed method being applied in radar imaging and other related fields.

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A Common Architecture for Digital Process of Ultrasonic Imaging System after AFE

Fang,

Zhou,

2023

2023 IEEE 15th International Conference on ASIC (ASICON)

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The Design of NCO Built in Ultra High-Speed Data Converter

Cited by 3 publications

References 5 publications

The Processing Method of Wrist Radial Artery Ultrasonic Signal Based on CORDIC Algorithm

The Processing Method of Wrist Radial Artery Ultrasonic Signal Based on CORDIC Algorithm

BPSK Modulation‐Based Local Oscillator‐Free IQ Demodulation for Millimeter Wave Imaging

A Common Architecture for Digital Process of Ultrasonic Imaging System after AFE

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