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Title:Analog Filter Design Using Ring Oscillator Integrator (ROI) in 180 nm CMOS
Author(s):Wang, Danyang
Contributor(s):Hanumolu, Pavan
Subject(s):analog filter
ring oscillator integrator
180nm CMOS
Abstract:In this thesis, a novel technique of implementing an integrated active analog filter is discussed. It employs a ring-oscillator integrator (ROI) as a key element to build an on-chip low-pass filter. The motivation is to implement an analog filter using integrated circuit technology instead of discrete components to achieve area-saving, which is a key constraint for wearable electronics. The traditional operational amplifier (op-amp) based active filter is largely limited by the finite gain of the op-amp itself and the non-ideality of transistors. Scaling also contributes to the unreliability of the op-amp based filter because the output resistance of the transistor is severely reduced. ROI, on the other hand, has much better DC gain, which is approximately infinite at low frequency and independent of process scaling. The unique property could greatly compress the non-ideality that exists in op-amp circuits. The design is first simulated in MATLAB/SystemVerilog to construct system-level requirements. Then the circuit-level simulation is performed using 180nm CMOS technology with 1.8V power supply in Cadence. The achieved bandwidth is 10MHz.
Issue Date:2014-05
Date Available in IDEALS:2014-10-24

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