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US 8,462,031 B2Granted
Continuous time analogue/digital converter
AssigneesSTMicroelectronics S.r.l., Centre National de Recherche Scientifique (CNRS)
InventorsDidier Belot, Jean-Baptiste Begueret, Yann Deval, Dominique Dallet, André Mariano
Life of this patent
Estimating the term…
Abstract
Continuous time analogue/digital converter, comprising a sigma delta modulator (MSD1) configured to receive an analogue input signal (x(t)) and comprising high-pass filtering means (MF) the chopping frequency of which is equal to half of the sampling frequency (Fs) of the quantization means (QTZ) of the modulator (MSD1).
Claims20
A continuous time analogue/digital converter, comprising:
- a sigma delta modulator configured to receive an analogue input signal and including a quantization means having a sampling frequency;
- and
- a high-pass filtering means having a chopping frequency that is equal to half of the sampling frequency of the quantization means.
A wireless communication device comprising:
- a sigma delta modulator configured to receive an analogue input signal and including a quantization means having a sampling frequency;
- and
- a high-pass filter having a chopping frequency that is equal to half of the sampling frequency of the quantization means.
A method comprising:
- receiving an analogue input signal;
- adding to the analogue input signal a feedback signal to generate a modified analogue signal;
- passing the modified analogue signal through a high-pass filter, filtering out a portion of the analogue signal having a frequency below a chopping frequency, the chopping frequency being approximately half a sampling frequency, to produce a filtered analogue signal;
- quantizing the filtered analogue signal at the sampling frequency to produce a digital signal;
- and
- converting the digital signal to an analogue signal to generate the feedback signal.
3 more elements
A continuous time analogue/digital converter, comprising:
- a sigma delta modulator configured to receive an analogue input signal;
- a quantizer having a sampling frequency;
- and
- a high-pass filter having a chopping frequency, the chopping frequency being equal to half of the sampling frequency, wherein the high-pass filter comprises a resonator.
1 more element
Dependencies are inferred from the claim text.