← 返回 JSSC 论文列表JSSC 2006第12期Digital Circuits0.6μm/0.3μmNeural Network AcceleratorOp-Amp
A Micropower Chopper-Stabilized Operational Amplifier Using a SC Notch Filter With Synchronous Integration Inside the Continuous-Time
提出了一种微功耗斩波稳定运算放大器，采用SC陷波滤波器消除斩波噪声。
1.8-5.5V, 17μA, 3μV输入偏移, 0.02μV/°C, 350kHz GBW, 125kHz斩波频率
微功耗斩波稳定SC陷波滤波器运算放大器CMOS
▸创新点1：斩波输入级 - 采用斩波技术显著降低输入失调电压和漂移，输入失调电压仅为3μV，漂移低至0.02μV/°C，提升了放大器的精度和稳定性（电路创新）。
▸创新点2：SC陷波滤波器消除斩波纹波 - 在连续时间信号路径中引入同步积分开关电容滤波器，有效抑制斩波频率相关的纹波噪声，提高信号纯净度（方法创新）。
▸创新点3：多路径嵌套米勒补偿保持高速信号路径 - 通过多路径嵌套米勒补偿技术，在保持高速信号路径不失真的同时，优化了放大器的频率响应和稳定性（系统创新）。
▸创新点4：宽电源电压范围与温度适应性 - 放大器支持1.8V至5.5V的宽电源电压范围，并在-40°C至125°C温度范围内稳定工作，适应多种应用场景（系统创新）。
Abstract
A micropower chopper stabilized opamp is presented. The new topology incorporates a switched capacitor filter with synchronous integration inside the continuous time signal path virtually eliminating chopping noise. A three-stage amplifier with multipath nested Miller compensation is modified to incorporate chopping of the input stage, sinc filtering to notch any chopping ripple, and a compensation scheme to maintain an undistorted high-speed signal path. Characteristics of the amplifier presented include rail to rail input and output operating on supplies of 1.8 to 5.5 V over 40 C to 125 C. Quiescent supply current is 17 A, input offset is 3 V , input offset drift is 0.02 V/ C, GBW is 350 kHz, and the chopping frequency is 125 kHz. Die area is 0.7 mm /50using a precision analog mixed-signal CMOS process combining low-noise 0.6- m analog transistors with 0.3- m digital CMOS capability.