设计了一种高性能的全差分型折叠式共源共栅放大器。一方面, 电路中使用了斩波技术和 A推挽技术, 以提高放大器的精确度和动态性能; 另一方面, 放大器中的电流源采用自级联结构, 可以进一步提高电路的电压裕度和鲁棒性。本电路基于华润上华 CMOS 0.35 μm工艺实现, 版图面积为 640 μm×280 μm, Spectre后仿真结果表明, 在电源电压为 5 V且斩波频率为156.25 kHz的情况下, 等效输入噪声为 1.11 nV/Hz1/2, 失调电压为 61.5 μV, 功耗为 1.22 mW。

A high performance fully differential folded-cascode amplifier is designed. On the one hand, in order to improve the amplifier’s precision and dynamic performance, the chopper and class-AB push-pull technique are applied in the circuit; on the other hand, to further improve the voltage margin and robustness in the circuit, the self-cascode current source is applied in the amplifier. The circuit is realized based on the CSMC 0.35 μm CMOS technique, and the layout area is about 640 μm×280 μm. The simulation results show: at a power supply of 5 V and the chopping frequency of 156.25 kHz, the equivalent input noise is 1.11 nV/Hz1/2, the offset voltage is 61.5 μV and the power consumption is 1.22 mW.