sigma-delta converter


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sigma-delta converter

[‚sig·mə ‚del·tə kən′vərd·ər]
(electronics)
A class of electronic systems containing both analog and digital subsystems whose most common application is the conversion of analog signals to digital form, and vice versa, using pulse density modulation to create a high-rate stream of single-amplitude pulses in either case. Also known as delta-sigma converter.

sigma-delta converter

A circuit that generates a 1-bit pulse density modulated (PDM) signal from analog input. It creates fixed-width pulses in relation to the amplitude of the analog waveform. As the wave amplitude rises, 1's are produced. As it falls, 0's result. If it remains neutral, alternating 01's are created. See PDM and SACD.
References in periodicals archive ?
One of the advantages of a sigma-delta converter, such as is used in the PXIe-4081, is the noise reduction it provides by bandwidth shaping.
The AD7175-2 A/D sigma-delta converter delivers 24 noise-free bits at 20 SPS and 17.2 noise-free bits at 250 kSPS providing designers a wider dynamic range, which enables smaller signal deviations to be measured as required within analytical laboratory instrumentation systems.
In addition, semiconductor sigma-delta converters tend to be low cost because of their digital nature.
CMOS sigma-delta converters; practical design guide.
Successive approximation register and sigma-delta converters arc well suited for the resolution and measurement signal bandwidths required in these diagnostic systems.
For frequency-domain applications, sigma-delta converters have distinct advantages, as described by National Instruments' Andy Deck, product marketing group manager for conditioned measurements, "Several of our DAQ modules with integrated signal conditioning utilize sigma-delta ADCs.
For sigma-delta converters, the correct choice of over-sampling rate in conjunction with modulator order is very important.
This precision difference amplifier is designed to accept [+ or -]140 V inputs and drive the newest generation of single supply analog-to-digital or sigma-delta converters. Additionally, a dedicated output amplifier allows the designer to attenuate, level shift, filter and scale the output signal.