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US 9,647,639 B1Granted
Baseband filters and interfaces between a digital-to-analog converter and a baseband filter
AssigneeQUALCOMM Incorporated
InventorIbrahim Chamas
Life of this patent
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Abstract
Exemplary embodiments of the present disclosure are related to baseband filters. A device may include a digital-to-analog converter (DAC) configured to output a DC current. The device may also include an operational amplifier coupled to an output of the DAC and configured to bias an input stage of the operational amplifier with the DC current.
Claims20
A device, comprising:
- a digital-to-analog converter (DAC) configured to output a direct current (DC) output;
- and
- an operational amplifier coupled to an output of the DAC, the output of the DAC configured to bias an input stage of the operational amplifier with the DC output, wherein a differential output of the operation amplifier comprises a first output coupled between a first pair of output transistors and a second output coupled between a second pair of output transistors.
A method, comprising:
- receiving a direct current (DC) output from an output of a digital-to-analog converter (DAC) at an operational amplifier;
- biasing an input stage of the operational amplifier with the DC output;
- and
- providing a differential output, a first output of the differential output provided via a first amplifier output coupled between a first pair of output transistors of the operational amplifier, and a second output of the differential output provided via a second amplifier output coupled between a second pair of output transistors.
1 more element
A device, comprising:
- means for receiving a direct current (DC) output from an output of a digital-to-analog converter (DAC);
- means for biasing an input stage of the means for receiving with the DC output;
- and
- means for outputting a differential output from the means from receiving, the means for outputting a differential output including a first output coupled between a first pair of output transistors and a second output coupled between a second pair of output transistors.
1 more element
Dependencies are inferred from the claim text.