Sigma-delta modulator and method for digitizing a signal
AssigneeMotorola, Inc.
InventorsTroy Lynn Stockstad, Douglas A. Garrity
Life of this patent
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Abstract
A sigma-delta modulator (10) and a method for digitizing an analog signal. The sigma-delta modulator includes at least one switch (16) for altering the order of the sigma-delta modulator (10). The order of the sigma-delta modulator (10) is changed based on the communication protocol of the received analog signal. More particularly, the order of the sigma-delta modulator (10) is increased for communication protocols having wide information-bandwidths. Alternatively, the order of the sigma-delta modulator (10) is decreased for communication protocols having narrow information-bandwidths.
Claims18
A sigma-delta modulator, comprising:
- a summing device having a first input, a second input, and an output;
- a first filter having an input coupled to the output of the summing device and an output;
- a second filter having an input coupled to the output of the first filter and an output;
- a first switch having a first terminal coupled to the output of the first filter, a second terminal coupled to the output of the second filter, and a third terminal;
- a quantizer having an input coupled to the third terminal of the first switch and an output;
- and
- a Digital-to-Analog Converter (DAC) having an input coupled to the output of the quantizer and an output coupled to the second input of the summing device.
A sigma-delta modulator, comprising:
- a first sigma-delta modulator having an input, a first output, and a second output;
- a second sigma-delta modulator having an input coupled to the first output of the first sigma-delta modulator and an output;
- a first switch having a first terminal coupled to the second output of the first sigma-delta modulator, a second terminal, and a third terminal;
- and
- a signal processor having a first input coupled to the second output of the first sigma-delta modulator, a second input coupled to the output of the second sigma-delta modulator, and an output coupled to the second terminal of the first switch.
A method for digitizing a signal having a protocol comprising the steps of:
- a) selecting a signal path in accordance with the protocol of the signal,
- b) toggling at least one switch to select the signal path;
- c) digitizing the signal, and
- c) altering a configuration of a sigma modulator in accordance with the protocol of the signal.
Dependencies are inferred from the claim text.