Dynamic characteristics of a digital transducer

Sigma delta (Σ-Δ) modulation is a technique that is widely used in a variety of signal processing and conditioning applications. This discrete data, closed loop, nonlinear device employs oversampling techniques to achieve a suitable signal to noise ratio. The modulator may be considered to be a control system in which the discrete output signal tracks an analogue input signal to provide analogue to digital conversion. Digital implementation of the circuits in VLSI silicon chip packages has many advantages over analogue equivalents such as size, cost and sensitivity to interference. The authors describe the implementation of digital transducers using Σ-Δ techniques