Abstract
This work presents the design of a new 2-2 programmable sigma delta modulator architecture, for different applications, this transformation design of the ΣΔ modulator low-pass, band-pass and high-pass or vice versa with loopbacks addition, which improved the linearity of the converter and reduced the quantization noise. In this work, the MASH structure enables the implementation of stable and high-order modulator. This makes low voltage and low power applications ideal. The simulation result for sigma delta modulator for biomedical applications exhibit a signal to noise ratio is 95 dB @ 250Hz bandwidth and a 75dB @ 200KHz ,85dB @1MHz for pass band modulator. The SNR is about 70dB for 5MHz bandwidth and for high pass application. This tool will allow a development contribution and characterize a system optimization set from the start while remaining at a high level of design that is suitable for electronic systems and models VHDL-AMS, RF, Biomedical.
Highlights
This Sigma delta (MΣΔ) modulators are widely used in signal processing and electronics for low power [7],[8],[9]
A ΣΔ band pass modulator performs the same operation as a low pass modulator, but around a resonant frequency fR around which the pass band is defined
To achieve a second order band pass ΣΔ modulator, it is necessary to make a change in the transfer functions of the integrators by multiplying by
Summary
This Sigma delta (MΣΔ) modulators are widely used in signal processing and electronics for low power [7],[8],[9]. To achieve higher resolutions zero optimization is a good technique to reduce in-band quantization noise without increasing the number of integrators. To do this the local resonance strategy can be used the M ΣΔ MASH 2-2 can affect the digital filters [6]. Their implementation becomes complicated, the realization of the transfer function of the signal STF unity, the integrators do not ideally deal with the quantization error relaxing their requirements of nonlinearity of amplifier gain and oscillation of exit.
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