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US 12,191,896 B2Granted
Radio frequency transmitter with dynamic impedance matching for high linearity
AssigneeQUALCOMM Incorporated
InventorsEdward Wai Yeung Liu, Vladimir Aparin
Life of this patent
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Abstract
Certain aspects of the present disclosure are directed to a radio frequency digital-to-analog converter (RFDAC). The RFDAC generally includes a plurality of digital-to-analog (DAC) unit cells. At least one DAC unit cell is capable of being configured in an active state or in a sleep state. For the at least one DAC unit cell, an output impedance of the DAC unit cell in the active state is equal to an output impedance of the DAC unit cell in the sleep state.
Claims23
A transmitter circuit configured to generate a signal for wireless transmission, the transmitter circuit comprising:
- a switched-capacitor array comprising a plurality of unit cells, wherein:
- each of the plurality of unit cells comprises a capacitor;
- and
- for at least a first unit cell of the plurality of unit cells, a terminal of the capacitor of the first unit cell is configured to be selectively coupled to a reference potential node, to a power supply rail, and to a common-mode voltage node,
- wherein the first unit cell comprises:
- a first switch configured to selectively couple the terminal of the capacitor of the first unit cell to the reference potential node;
- a second switch configured to selectively couple the terminal of the capacitor of the first unit cell to the power supply rail;
- and
- a third switch configured to selectively couple the terminal of the capacitor of the first unit cell to the common-mode voltage node.
6 more elements
A wireless communication device comprising:
- a switched-capacitor array configured to generate a signal at a transmission frequency and comprising a plurality of unit cells, wherein:
- each of the plurality of unit cells comprises a capacitor and is capable of being configured in a first state or in a second state, the second state being different from the first state;
- and
- for at least a first unit cell of the plurality of unit cells, the first unit cell is configured to couple a terminal of the capacitor of the first unit cell to a common-mode voltage node during the second state;
- and
- an antenna configured to output signals for wireless transmission at the transmission frequency,
- wherein the first unit cell is further configured to selectively couple the terminal of the capacitor to a reference potential node or to a power supply rail during the first state, and
- wherein the first unit cell comprises:
- a first switch configured to selectively couple the terminal of the capacitor of the first unit cell to the reference potential node;
- a second switch configured to selectively couple the terminal of the capacitor of the first unit cell to the power supply rail;
- and
- a third switch configured to selectively couple the terminal of the capacitor of the first unit cell to the common-mode voltage node.
9 more elements
A wireless communication device, comprising:
- a switched-capacitor array configured to generate a signal at a transmission frequency and comprising a plurality of unit cells, wherein:
- each of the plurality of unit cells comprises a capacitor and is capable of being configured in a first state or in a second state, the second state being different from the first state;
- and
- for at least a first unit cell of the plurality of unit cells, the first unit cell is configured to couple a terminal of the capacitor of the first unit cell to a common-mode voltage node during the second state;
- an antenna configured to output signals for wireless transmission at the transmission frequency, wherein the antenna is coupled to an output of the switched-capacitor array and wherein another terminal of the capacitor of the first unit cell is coupled to the output of the switched-capacitor array;
- and
- a transformer including a primary winding coupled to the output of the switched-capacitor array and including a secondary winding coupled to the antenna.
4 more elements
Dependencies are inferred from the claim text.