一种基于双钳位技术的宽范围高精度电流匹配的电荷泵设计

Design of charge pump with wide range and high precision current matching based on double-clamp technology

摘要:

基于TSMC 65nm CMOS工艺,本文设计了一款基于双钳位计数实现在宽电压范围下满足高精度电流匹配电荷泵电路,双钳位技术可以避免使用轨对轨运放所带来的电路结构复杂化的问题。并且通过增加调节开关管和互补开关计数,有效地优化了电荷共享、时钟馈通以及电荷注入等非理性效应对电路的影响,仿真结果表明,与传统电荷泵电路相比,在电源电压1.2V,电荷泵电流为50uA时,双钳位电荷泵电路的电流匹配度在0.2~1.0V范围内可以保持在0.03%以内。

Abstract:

Based on TSMC 65nm CMOS technology, this paper designs a double-clamp counting circuit to meet the high precision current matching charge pump circuit in a wide voltage range. The double-clamp technology can avoid the complicated circuit structure caused by rail-to-rail operation amplifier. Moreover, the influence of non-rational effects such as charge sharing, clock feedthrough and charge injection on the circuit is effectively optimized by adding the count of the regulating switch tube and the complementary switch. The simulation results show that, compared with the traditional charge pump circuit, when the power supply voltage is 1.2V and the charge pump current is 50uA, the power supply voltage is 1.2V. The current matching degree of the double-clamp charge pump circuit can be maintained within 0.03% in the range of 0.2~1.0V.