Analysis and Design of High-Performance Asynchronous Sigma-Delta Modulators With a Binary Quantizer

Abstract

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A 0.18-$\mu $m current-mode asynchronous sigma-delta modulator design

“…A prior circuit design and implementation of an asynchronous sigma-delta modulator have been done, using voltage mode circuits [13].…”

Analytical Expressions for the Distortion of Asynchronous Sigma–Delta Modulators

“…The output DC level has been compared both with the accurate theory of (13) and the approximate theory of (14). Take in mind that for DC signals we have F (0) = 1, and Re{F (ω c )} can be obtained by combining (8) and (10), so (13) will collapse to:…”

“…[8]- [11]. However, [10] and [11] concern PWM structures that deviate from the class that is studied in this manuscript.…”

“…In particular, the modulation frequency is not necessarily constant. On the other hand, [8] and [9] do focus on the same class of ASDMs as our manuscript. However, [8] concerns a simulation based aproach instead of an analytical one.…”

“…On the other hand, [8] and [9] do focus on the same class of ASDMs as our manuscript. However, [8] concerns a simulation based aproach instead of an analytical one. The only work that presents analytical expressions to predict the 3rd order harmonic distortion of an ASDM is by Roza [9].…”