Switched capacitor analog modulo integrator for application in open loop Sigma-Delta modulators |
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Authors: | Carsten Wulff Øystein Knauserud Trond Ytterdal |
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Affiliation: | (1) Department of Electronics and Telecommunication, Norwegian University of Science and Technology, Trondheim, 7491, Norway |
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Abstract: | We introduce the switched capacitor analog modulo integrator, which to our knowledge is a new circuit. We introduce the amplitude
modulated open loop ΣΔ modulator (OLSDM), which is an analog modulo integrator followed by a quantizer and a modulo differentiator.
The mathematical equivalence between low pass ΣΔ modulators and OLSDM is explained. Behavioral simulations confirm the equivalence.
The necessary circuit, a switched capacitor analog modulo integrator, is explained in detail. Behavioral level simulations
in SPICE of the analog modulo integrator verify the function, and prove the concept of amplitude modulated OLSDM. |
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Keywords: | Σ Δ Modulators Switched capacitor circuits Analog modulo integrator |
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