Frequency-modulated continuous-wave (FMCW) signals-based radar systems can outrun the optical and ultrasound sensors in dark and severe weather conditions. FMCW radar systems require a fast settling frequency synthesizer to reduce the chirp signal’s inactive and modulation times. This work proposes a new C-B and FMCW Transmitter based on Fast Settling Fractional-N DPLL (FS-FNDPLL) and ring-based pulse injection locking oscillator (R-PILO). The proposed FS-FNDPLL generates an ultra-fast low-noise smooth narrowband chirp by introducing an automatic controller-based TDC switching (AC-TDCSw) scheme in the forward loop of FNDPLL. Also, the proposed FS-FNDPLL employs a new background gain calibrated digital-to-time converter (BGC-DTC) as a fractional divider in the feedback path for the quantization noise cancellation (QNC). The proposed FMCW transmitter uses an R-PILO to produce fast switching adjacent carriers after generating a narrowband chirp using FS-FNDPLL. The main features of the proposed FMCW to accelerate settling time with AC-TDCSw, BGC-DTC and the integration of spur suppressing pulse generator (SSPG) in R-PILO enable ultra-fast chirps with less phase noise and spur levels. The proposed transmitter up-converts the 500$$MHz narrowband chirp signal onto four adjacent carriers for obtaining a 2$$GHz chirp at the C-band. The simulation results prove that the proposed FMCW Transmitter consumes 79$$mW power. Furthermore, the phase noise of the proposed FS-FNDPLL is reduced to $-113$$$dBc/Hz at 1$$MHz. The proposed FS-FNDPLL reduces the settling time to 1$$$\mu$s with the introduced AC-TDCSw scheme.

基于调频连续波 (FMCW) 信号的雷达系统可以在黑暗和恶劣的天气条件下超越光学和超声波传感器。FMCW 雷达系统需要一个快速建立的频率合成器来减少线性调频信号的无效和调制时间。这项工作提出了一种基于快速稳定小数 N DPLL (FS-FNDPLL) 和基于环的脉冲注入锁定振荡器 (R-PILO) 的新型 CB 和 FMCW 发射机。所提出的 FS-FNDPLL 通过在 FNDPLL 的前向环路中引入基于自动控制器的 TDC 切换 (AC-TDCSw) 方案来生成超快速低噪声平滑窄带线性调频脉冲。此外，拟议的 FS-FNDPLL 采用新的背景增益校准数字时间转换器 (BGC-DTC) 作为量化噪声消除 (QNC) 反馈路径中的小数分频器。所提出的 FMCW 发射机使用 R-PILO 在使用 FS-FNDPLL 生成窄带线性调频信号后生成快速切换相邻载波。所提出的 FMCW 的主要特点是通过 AC-TDCSw、BGC-DTC 和在 R-PILO 中集成杂散抑制脉冲发生器 (SSPG) 来加快稳定时间，从而实现超快线性调频，相位噪声和杂散水平更低。建议的发射器将 500$$MHz 窄带线性调频信号到四个相邻载波以获得 2$$C 波段的 GHz 线性调频。仿真结果证明，所提出的 FMCW 发射机消耗 79$$毫瓦功率。此外，所提出的 FS-FNDPLL 的相位噪声降低到$-\mathrm{1个}\mathrm{1个}\mathrm{3个}$$$dBc/Hz 在 1$$兆赫兹。提议的 FS-FNDPLL 将建立时间减少到 1$$$\mu$s 与引入的 AC-TDCSw 方案。