Title :
The effect of integrator leak in Σ-Δ modulation
Author :
Feely, Orla ; Chua, Leon O.
Author_Institution :
Dept. of ELectr. Eng. & Comput. Sci., California Univ., Berkeley, CA, USA
fDate :
11/1/1991 12:00:00 AM
Abstract :
A method is presented which makes it possible to determine exactly the effect of integrator leak on the performance of the single-loop Σ-Δ modulator with DC input. Theory from the field of nonlinear dynamics is used to provide an analytical description of the behavior of the single-loop modulator with leaky integrators. Integrator leak is inevitable in any practical circuit implementation due to finite op-amp gain. The results obtained make it possible to discuss in quantitative rather than qualitative terms the robustness of the sigma-delta system to this circuit imperfection
Keywords :
analogue-digital conversion; integrating circuits; modulators; ADC; DC input; finite op-amp gain; integrator leak; leaky integrators; oversampling; sigma-delta modulator; single-loop modulator; Analog-digital conversion; Circuits; Delta modulation; Delta-sigma modulation; Feedback loop; Limit-cycles; Operational amplifiers; Quantization; Robustness; Signal processing;
Journal_Title :
Circuits and Systems, IEEE Transactions on
