A novel startup circuit for current-mode bandgap reference (CMBGR) is proposed to resolve startup issues in low-voltage CMOS processes while simultaneously addressing design cost, PVT (Process, Voltage, Temperature) robustness, CMBGR performance, and curvature compensation compatibility constraints. The circuit employs a dynamic threshold voltage mechanism implemented in 0.11 μm CMOS technology, utilizing a simple design that dynamically adjusts the startup threshold to ensure reliable operation across varying PVT conditions. Validation was conducted through 20,400 Monte Carlo simulations under diverse PVT settings, all confirming successful CMBGR startup without failure. The CMBGR operates across a supply voltage range of 2.3–4.3 V, delivering a configurable reference voltage output from 0.1 to 2.0 V. A temperature coefficient of 8.7 ppm/°C was achieved, maintaining the inherent low-temperature-coefficient characteristic of CMBGR. The design preserves CMBGR's configurability and compatibility with existing curvature compensation strategies, eliminating the need for additional circuitry or performance trade-offs. This approach provides a comprehensive solution for stable startup in configurable CMBGR applications