Abstract
In this work, we present a new proposal for the second-order Adaptive Sigma Delta Modulation (ASDM). The new proposed Adaptation scheme is based on using Operational Transconductance Amplifier (OTAs) as an Integrator and as an Amplifier to adapt the quantizer step-size to control the voltage gain by feedback the quantizer output through adaptation scheme. The step-size is changing up or down by the output voltage of the integrator for every clock period. A comparison with general second-order SDM proves that our idea about using OTAs to achieve a high resolution and confirm the signal-to-noise ratio is better than GSM.
Highlights
The over sampling Sigma-Delta modulation is very important subject in many modern communication systems
We can adapt the quantization level to the size of the input difference signal, using the output signal to perform the signal-to-noise ratio (SNR) that is uniform through the dynamic range of the difference signal
The dc value, determined over the time constant of the LPF, is very small. This small value controls IABC and Av, the step-size is made small at the amplifier input making the Amplitude of the output small, this produces a reconstructed output that track the slop of the input, where the dynamic range is increased past that which would be possible with a controlled Operational Transconductance Amplifier (OTAs) gain
Summary
The over sampling Sigma-Delta modulation is very important subject in many modern communication systems. Different proposed systems are used to: quantize continuous amplitude signals into discrete amplitude sequences and deliver high-resolution analog-to-digital (A/D) conversion using low-precision analog components. A general second order Sigma-Delta modulation is shown in Fig. 1; it consists of two integrators and a single bit analog to digital converter and feedback digital-to-analog converter. The large amplitude signal Y(KTs) usually integrated into the first and second integrator of the over sampling A/D converter.
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