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Design >> Mixed-Signal Design >> sigma-delta modulator simulink model
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Message started by trashbox on Nov 9^th, 2005, 1:19am

Title: sigma-delta modulator simulink model
Post by trashbox on Nov 9^th, 2005, 1:19am

Many sigma-delta modulator's simulink models include some gain blocks, whose gain value may be 0.5/1.0/2.0. How to decide these gain values and how to decide whether the gain block is needed? (suppose the sigma-delat modulator is used in fraction-N phase-locked pll)

Thanks very much!

Title: Re: sigma-delta modulator simulink model
Post by chase.ng on Nov 16^th, 2005, 12:57am

the gains in ur delta sigma adc determine how ur adc going to shape the quantization noise in passband. it is part of the system design. take a look at ken martin's analog integrated circuit design.