Jian-Chang Du, Zhigong Wang, Xi Chen, Jian Xu, Bing-Bing Ma
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引用次数: 1
摘要
由于温度和工艺角的变化,环形振荡器在CMOS工艺中实现的输出频率不会恒定。为了获得一个相对恒定的频率,需要一个额外的电路来补偿温度和过程角的变化。在传统环振荡线性补偿方法的基础上,提出了一种补偿系数最小二乘算法。利用该方法逼近方程组的最优解,得到可能的最佳补偿控制电压组。该振荡器在- 20°C至80°C的温度范围和各个工艺角的中心频率为9.844 MHz,最大偏差仅为1.5%(模拟前)和1.7%(模拟后)。该设计采用中芯国际0.18 μm CMOS技术进行仿真验证,采用2.5 v电源,最大功率为1 m W。
Design of a Ring Oscillator with Temperature and Process Compensation Adopting a Novel Method
Due to the variation of temperature and process corner, a ring oscillator implemented in a CMOS process will not have a constant output frequency. In order to get a relatively constant frequency, an additional circuit is needed to compensate the variation in both temperature and process corner. Based on the traditional method of ring-oscillation linear compensation, a new type of compensation coefficient least-squares algorithm is presented in this paper. This method is used to approximate the optimal solution of the system of equations, and the best possible compensation control voltage group is obtained. The proposed oscillator has a center frequency of 9.844 MHz in the temperature range of −20°C to 80°C and at various process corners, with a maximum deviation of only 1.5% (pre-simulation) and 1.7% (post-simulation). The design was simulated and verified in SMIC 0.18-μm CMOS technology, uses a 2.5-V supply, and consumes a maximum power of 1 m W.