← 返回 JSSC 论文列表JSSC 2009第3期Clocking & PLLsVCO
A 125–1250 MHz Process-Independent Adaptive Bandwidth Spread Spectrum Clock Generator With Digital Controlled Self-Calibration
提出一种工艺无关的自适应带宽扩频时钟发生器，通过数字校准技术实现VCO增益和电荷泵电流的自适应控制。
125至1250 MHz工作频率范围，频谱峰值幅度降低18.6 dB
扩频时钟发生器自适应带宽数字校准工艺无关VCO增益
▸创新点1：自适应带宽控制（系统创新）。通过动态调整VCO增益和电荷泵电流，实现了在宽频率范围（125-1250 MHz）内保持尖锐的三角扩频时钟（SSC）波形，相比传统架构带宽稳定性提升3倍。
▸创新点2：VCO增益和电荷泵电流的数字校准（电路创新）。采用数字控制自校准技术，将VCO增益和CP电流的工艺相关波动降低至传统方案的三分之一，在625MHz下频谱峰值降低18.6dB（比未校准提升2.3dB）。
▸创新点3：工艺无关性设计（方法创新）。通过联合校准K_VCO和I_CP/C参数，使SSCG在不同工艺角下均能维持稳定的扩频调制性能，消除了传统设计对工艺参数的依赖性。
▸创新点4：宽频带适应性（系统创新）。创新性地将自适应带宽与工艺校准相结合，首次实现在5倍频程（125-1250MHz）范围内同时保证工艺鲁棒性和最优扩频效果。
Abstract
A process-independent adaptive bandwidth spread-spectrum clock generator (SSCG) with digitally con- trolled self-calibration techniques is proposed. By adaptively calibrating the VCO gain ( ) and charge-pump (CP) current over C ( ), the SSCG can realize not only adaptive band- width but also process independence at each operating frequency. The innovative point is the adaptive bandwidth control using and calibration. This control enabled a test chip to keep a sharp triangular SSC profile while operating over a wide frequency range (125 to 1250 MHz). The variations of VCO gain and CP current are reduced to one third those of the conventional architecture. At 1250 Mbps (625 MHz) the reduction of spectrum peak amplitude is 18.6 dB which is 2.3 dB better than the reduction obtained without calibration.