Device to compensate for the non-linearity of an analog/digital converter
AssigneeThomson-CSF
InventorsRobert Berranger, Jean-Luc de Gouy
Life of this patent
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Abstract
The method consists of the adding of a dither signal of constant amplitude, frequency-modulated by noise, to the signal applied to the input of the converter. An automatic control link is set up between the level of the added interference signal and the signal applied to the input of the converter so that the level of the input signal added to the level of the added interference signal is equal to the level of the full scale signal of the converter. Application to digital communications radio receivers.
Claims10
A method for linearizing an analog to digital converter, comprising:
- receiving an analog signal to be converted by the analog to digital converter;
- generating a noise signal having a constant amplitude;
- frequency modulating said noise signal with a carrier signal to produce an interference signal having a constant amplitude;
- and
- adding the interference signal to the analog signal prior to inputting the analog signal to the analog to digital converter.
An apparatus for linearizing an analog to digital converter, comprising:
- a device configured to receive an analog signal to be converted by the analog to digital converter;
- a noise generating circuit configured to generate noise signal having a constant amplitude;
- a frequency modulator configured to frequency modulate said noise signal with a carrier to produce an interference signal having a constant amplitude;
- an adder circuit coupled to said device, said adder circuit being configured to add the interference signal to the analog signal prior to inputting the analog signal to the analog to digital converter.
A radio receiver for converting a received analog signal into a digital signal, comprising:
- a device configured to receive an analog signal to be converted by the analog to digital converter;
- a noise generating circuit configured to generate a noise signal having a constant amplitude;
- a frequency modulator configured to frequency modulate said noise signal with a carrier to produce an interference signal having a constant amplitude;
- an adder circuit coupled to said device, said adder circuit being configured to add the interference signal to the analog signal prior to inputting the analog signal to the analog to digital converter.
An apparatus for linearizing an analog to digital converter, comprising:
- means for receiving an analog signal to be converted by the analog to digital converter;
- means for generating a noise signal having a constant amplitude;
- means for frequency modulating said noise signal with a carrier to produce an interference signal having a constant amplitude;
- and
- means for adding the interference signal to the analog signal prior to inputting the analog signal to the analog to digital converter.
Dependencies are inferred from the claim text.