⚡ 本页包含 AI 生成的分析内容，仅供参考
该论文提出了一种结合斩波和相关双采样技术的微功率放大器，解决了斩波稳定技术中低频噪声残留和自动归零技术中宽带噪声混叠的问题。通过输入斩波和相关双采样的组合，有效消除了斩波纹波，实现了2µV标准偏差的失调和37nV/√Hz的输入噪声密度。
University of Pavia, Pavia, Italy National Semiconductor, Rozzano, Italy 2 A key limit of the chopper stabilized technique is that the low-frequency noise after being shifted up to the chopping frequency is only partially removed by filtering. The auto-zero method does not suffer this limit, but the aliasing of the broadband input noise spectrum imposes the use of large sampling capacitances that, in turn, increase the bias current. The chopper method is the optimal approach for micro-power applications. This design uses a chopper, but avoids the chopper ripple at fs by combining input chopping with correlated double sampling (CDS) at the output of the first stage of the amplifier. Figure 4.2.1 shows the block diagram. The chopped input signal, added to offset and 1/f noise, is amplified by the first stage. Assuming that offset and 1/f noise do not saturate the amplifier, their contribution is
Massimiliano Belloni1, Edoardo Bonizzoni1, Andrea Fornasari2, Franco Maloberti1