一种新颖的低压开关型opamp连续共模反馈

Proceedings of the 2004 International Symposium on Low Power Electronics and Design (IEEE Cat. No.04TH8758) Pub Date : 2004-08-09 DOI:10.1145/1013235.1013308

M. Ali-Bakhshian, K. Sadeghi

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引用次数: 5

摘要

针对低压开关放大器(SO)电路，提出了一种新的轨对轨快速连续共模反馈(CMFB)策略。输出电压的测量采用了由大容量信号引起的阈值电压变化。为了满足速度要求，共模电平的平均和误差信号的放大在一个块中实现。最后，通过向输出节点施加与误差电压相关的电流来控制测量的CM电平。作为设计实例，给出了一种采用该技术的改进的级联2-1 δ - σ调制器低压开关放大器。采用0.18 /spl mu/m技术和V/sub DD/=0.9 V进行SPICE仿真，证实了CMFB电路的预期精度和速度。

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A novel continuous-time common-mode feedback for low-voltage switched-OPAMP

A novel rail-to-rail and fast continuous-time common-mode feedback (CMFB) strategy is presented for low-voltage switched-opamp (SO) circuits. The threshold voltage change due to bulk signal is used to measure the output voltage. To satisfy speed requirements, averaging common-mode (CM) level and amplifying error signal are realized in a single block. Finally, the measured CM level is controlled by applying an error-voltage dependent current to the output nodes. As a design example, a modified low-voltage switched-opamp in a cascade 2-1 delta-sigma modulator adopting the proposed technique is presented. SPICE simulation using a 0.18 /spl mu/m technology and V/sub DD/=0.9 V is provided which confirms the expected accuracy and speed of the CMFB circuitry.

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Proceedings of the 2004 International Symposium on Low Power Electronics and Design (IEEE Cat. No.04TH8758)

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