Bitstream Controlled Reference Signal Generation for a Sigma-Delta Modulator
AssigneeKoninklijke Philips Electtronics N.V.
InventorsMichiel Pertijs, Kofi Makinwa, Johan Huijsing
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Abstract
When a reference signal is generated for a digital-to-analog converter in the feedback path of a sigma-delta modulator, the reference signal can contain modulated error signals, for example when the reference generator implements dynamic element matching. By controlling the reference signal generation in dependence on the bitstream output from the sigma-delta modulator, the effects of intermodulation of the reference signal with the bitstream can be reduced.
Claims24
A system for controlling a reference signal generator for a sigma-delta modulator, comprising:
- a sigma-delta modulator for providing a bitstream from an input signal, the modulator having a feedback path including a digital-to-analog converter DAC;
- a reference signal generator for providing a reference signal for the DAC, the generator producing a reference signal that includes an error signal pattern;
- and
- a control module for receiving the bitstream and generating a control signal for controlling the error signal pattern in dependence on the bitstream.
A control circuit for controlling an error signal pattern in a reference signal generator for a sigma-delta modulator, the control circuit being configured to receive a bitstream from a sigma-delta modulator;
- and
- to generate a control signal for controlling the error signal pattern in dependence on the bitstream.
A method of controlling an error signal pattern in a reference signal generator for a sigma-delta modulator, comprising:
- receiving a bitstream from a sigma-delta modulator;
- generating a control signal for controlling the error signal pattern in dependence on the bitstream.
Dependencies are inferred from the claim text.