This work presents a novel frequency compensation method for four‐stage CMOS amplifiers, addressing the complexity and instability challenges prevalent in modern low‐voltage, low‐power electronic systems. The proposed approach employs nested differential gain stages combined with a single, compact Miller capacitor at the common output, which enables efficient frequency compensation while minimizing chip area and power consumption. The amplifier benefits from the topological advantages of differential stage integration, allowing the Miller effect to be virtually amplified across multiple feedback loops and facilitating the use of a smaller compensation capacitor. The linear transfer function (TF) of the design is meticulously derived through symbolic computation and then validated against circuit‐level simulations performed with 0.18 μm CMOS technology. Results demonstrate a strong agreement between theoretical and simulated data, with the amplifier achieving exceptional performance metrics: a DC gain of 122 dB, a gain‐bandwidth product (GBW) of 4.1 MHz, and a phase margin (PM) of 89°, while consuming less than 360 μW. Robustness is verified across process corners and through Monte Carlo analysis, confirming consistent performance under varying load capacitance and design parameters. Overall, this work presents an efficient and scalable compensation technique suitable for next‐generation analog and mixed‐signal applications.
Moghadam et al. (Thu,) studied this question.