Iad Gesellschaft Für Informatik, Automatisierung Und Datenverarbeitung Mbh

Oliver Eckhof

Hermann Hampel

Ulrich Berold

Johannes Hampel

Manfred Deinzer

Abdul Rahman Hanoun

Andreas Bänisch

Abdulrahman Hanoun

A delta-sigma modulator for a switching amplifier, which achieves a high signal-to-noise ratio (SNR) in the multi-MHz range and keeps the noise-transfer function over the useful frequency range as low and as flat as possible. A series connection of a parallel-serial converter and a downstream swap element for the serial output signal yof the parallel serial converter is connected to the multi-bit output of the delta-sigma-modulator. The swap element swaps, based on the last bit value 0 or 1 of a preceding word in the resulting output signal y, the sequence of the binary zeroes and ones of the current word, where present, and then an input signal is fed to the delta-sigma-modulator. The signal is capable of having a frequency range above 25 kHz, and is prepared with a low oversampling ratio and a high SNR. And, 1-0 or 0-1 transitions are largely eliminated at the word boundaries.

Device having a delta-sigma modulator and a switching amplifier connected thereto

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Gutenstetten, Germany

Oliver Eckhof