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A CMOS digitally programmable filter technique for VLSI applications

机译:用于VLSI应用的CMOS数字可编程滤波器技术

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A novel technique for designing analog CMOS integrated filters is proposed. The technique uses digitally controlled current amplifiers (DCCAs) to provide precise frequency and/or gain characteristics that can be digitally tuned over a wide range. This paper provides an overview of the possibilities of using the DCCA as the core element in programmable filters. In mixed analog/digital systems, the digital tuning feature of the proposed approach allows direct interfacing with the digital signal processing (DSP) part. Basic building blocks such as digitally programmable amplifiers, integrators, and simulated active inductors are given. Systematic designs of second-order filters are presented. Fully differential architectures of the proposed circuits are developed. Experimental results obtained from 0.5 μm standard CMOS chips are provided.
机译:提出了一种设计模拟CMOS集成滤波器的新技术。该技术使用数控电流放大器(DCCA)来提供精确的频率和/或增益特性,可以在很宽的范围内进行数字调谐。本文概述了在可编程滤波器中使用DCCA作为核心元素的可能性。在混合的模拟/数字系统中,所提出方法的数字调谐功能允许与数字信号处理(DSP)部分直接接口。给出了基本的构建模块,例如数字可编程放大器,积分器和模拟有源电感器。介绍了二阶滤波器的系统设计。开发了所提出电路的全差分架构。提供了从0.5μm标准CMOS芯片获得的实验结果。

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