Stable high-order delta-sigma DACS
نویسندگان
چکیده
Stability analysis of high-order delta-sigma loops is a challenge. In this brief, a sufficient design criterion is presented for highorder multibit error-feedback DACs which are especially suitable for high-speed operation. This analytical criterion might be too conservative, but it allows the design of stable, robust, and high-resolution deltasigma DACs. Both analytical and numerical analysis are performed for verification. Also, experimental results of a discrete-component multiplier-free prototype demonstrate 10-bit operation at a very low oversampling ratio of 4.
منابع مشابه
New design criterion for high-order DACs
Stability analysis of high-order delta-sigma loops is a challenge. In this work, a novel design criterion is presented for error-feedback DACs which are especially suitable for high-speed operation. This criterion allows the design of unconditionally stable, robust, high-order delta-sigma DACs. Both analytical and numerical analysis are performed for verification. Total Pages (including 2 docum...
متن کاملDirect Digital-to-RF Conversion for Mobile-Phone Basestation Applications using Bandpass Sigma Delta Modulation
Sigma-delta modulator based digital-to-analog converters (DAC) have offered low-frequency designers a highly linear, high resolution data converter architecture that is highly amenable to integration with complex digital systems. Increasingly these data converters have been used to deliver all the power needed. In wireless applications, it is increasingly desirable to apply low-frequency sigma-...
متن کاملDesign of Continuous-Time Σ∆ Modulators with Real Analog Blocks
The design of Continuous-Time (CT) Sigma-Delta modulator obtained by a discrete-time prototype is discussed. A proper heuristic transformation of the prototype enables an exact equivalence of CT and DT. This permits the trimming by computer simulations of the coefficients of the CT to account for the effect of real analog blocks. Simulation results for a second and third order scheme with real ...
متن کاملDelta-Sigma Modulators using Frequency- Modulated Intermediate Values
This paper describes a new firstand second-order delta-sigma modulator concept where the first integrator is extracted and implemented by a frequency modulator with the modulating signal as the input. The result is a simple delta-sigma modulator with no need for digital-to-analog converters, allowing straight-forward multi-bit quantization. Without the frequency modulator, the circuit becomes a...
متن کاملSimplified Logic for First-Order and Second-Order Mismatch-Shaping Digital-to-Analog Converters
Mismatch-shaping digital-to-analog converters (DACs) have become widely used in high-performance delta–sigma data converters because they facilitate delta–sigma modulators with multibit quantization. Relative to single-bit quantization, multibit quantization significantly relaxes the analog circuit performance necessary to achieve a given level of data converter precision, but significant digit...
متن کامل