Sigma-Delta Modulation using Switched-Current Techniques

TL;DRAbstract

Oversampled analog-to-digital (A/D) conversion based on sigma-delta (SD) modulation has gained increasing popularity. By sampling much faster than the Nyquist rate, oversampled converters can take advantage of available speed and exchange resolution in time for resolution in amplitude. SD modulation provides a noise shaping property that permits the use of coarse quantization only requiring robust components which are largely insensitive to component mismatch. These characteristics are well suited for VLSI technology and allow SD converters to be integrated on the same chip with digital signal processing circuitry. This is desirable because system integration increases and employing a single technology, which does not require high precision elements, is economically attractive. At the present time the dominant method of implementing SD modulators is the switchedcapacitor technique. This technique requires linear capacitors which are not necessary in digital technologies. In the last fe

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