Sigma-delta converter arrangement
AssigneeInfineon Technologies AG
InventorsVictor Dias, Josef Fenk
Life of this patent
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Abstract
The invention discloses a sigma-delta converter arrangement with a forward path including an amplifier and a quantizer with a clock input, and a feedback path with a D/A converter. The amplifier is coupled to an integrator which is in the form of a resonator with a tunable frequency and is actuated by a frequency synthesizer that also prescribes the clock rate of the quantizer. The synchronization between the quantizer and resonator results in highly accurate matching given inexpensive integratabiliy, which means that the sigma-delta converter is suitable for use in mobile radios, for example.
Claims19
A sigma-delta converter, comprising:
- a series circuit between an input and an output of the sigma-delta converter, the series circuit comprising at least one amplifier with a predetermined transfer function and a quantizer with a clock input;
- a feedback path which connects the output of the series circuit to the input thereof, wherein the feedback path comprises a digital/analog converter;
- a resonator with a tunable resonant frequency, the resonator having an output coupled to the amplifier to form an integrator;
- and
- a frequency control block configured to control a resonant frequency of the resonator, the frequency control block further coupled to a clock input of the quantizer.
A sigma-delta converter, comprising:
- an amplifier having an input comprising an input of the sigma-delta converter, and having an output;
- a quantizer having an input coupled to the output of the amplifier, and having an output comprising an output of the sigma-delta converter;
- a digital/analog converter coupled between the output of the sigma-delta converter and the amplifier, the digital/analog converter comprising a feedback path;
- a resonator configured to operate at a plurality of resonant frequencies coupled to the amplifier to form an integrator;
- and
- a frequency control block configured to vary the resonant frequency of the resonator.
Dependencies are inferred from the claim text.