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US 5,675,335 AGranted
Method of improving the distortion behavior of analog-to-digital converters
AssigneeWandel & Goltermann GmbH & Co. Elektronische Messtechnik
InventorHelmut Keller
Life of this patent
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Abstract
In a method of improving a distortion ratio of an analog-to-digital converter, an analog signal to be digitized is additively superposed with a band-limited noise signal. The thusly produced sum signal is supplied to the analog-to-digital converter for sampling and quantization.
Claims4
A method of improving the distortion behavior of an analog-to-digital converter, comprising additively superposing an analog information signal with a noise signal to produce a sum signal;
- subsequently supplying the sum signal to an analog-to-digital converter so as to sample and digitize the sum signal;
- and band-limiting the noise signal to a frequency range located outside an information frequency range before said additively superposing the analog information signal with the noise signal, said limiting including selecting a RMS value of the noise signal substantially greater than a RMS value of a quantization noise of the analog-to-digital converter.
Dependencies are inferred from the claim text.