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Signal generation using single-bit sigma-delta techniques
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DOI：10.1109/TIM.2004.831447.png)
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Abstract
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In this paper, we present a digital oscillator, based on the single-bit SigmaDelta modulation principle. With the exception of a front end analog filter, the proposed circuit is entirely digital. The oscillator is achieved by the use of a SigmaDelta modulator in the digital resonator loop. A novel topology for constructing stable high-order 1-bit modulators is described. A fourth-order low-pass and eighth-order bandpass oscillators are implemented in field-programmable gate array prototype. The experimental results demonstrate stability and feasibility, achieving more than 110-dB dynamic range for the generated signals.
Keywords:
Sigma Delta modulator
digital oscillator
lossless digital integrator (LDI) filter
sine wave generation
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