Integrated circuits and transponder circuitry with shared modulation capacitor for 3D transponder uplink modulation
AssigneeTexas Instruments Incorporated
InventorErnst Georg Muellner
Life of this patent
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Abstract
Disclosed examples include multichannel RF transponder circuits with multiple transponder channel circuits individually connected to a corresponding antenna circuit, a configurable shared modulation capacitor, a channel switching circuit to selectively connect the modulation capacitor to a selected transponder channel circuit, and a modulation circuit to selectively change the capacitance value of the modulation capacitor between two or more values according to a modulation control signal to transmit uplink data using the selected transponder channel circuit.
Claims18
An electronic device comprising:
- a plurality of transponder channel circuits;
- a plurality of transponder antenna circuits, each coupled to a respective one of the transponder channel circuits;
- and
- a shared capacitor circuit including:
- a variable capacitor device;
- a switching circuit to selectively connected the variable capacitor device to a selected one of the transponder channel circuits;
- and
- a control circuit to control the variable capacitor device to provide a selected capacitance.
An electronic key fob device comprising:
- a first transponder channel circuit;
- a first antenna coupled to the first transponder channel circuit;
- a second transponder channel circuit;
- a second antenna coupled to the first transponder channel circuit;
- and
- a shared capacitor circuit including:
- a variable capacitor device;
- a switching circuit to selectively connected the variable capacitor device to an input of a selected one of at least the first and second transponder channel circuits;
- and
- a control circuit to control the variable capacitor device to provide a selected capacitance.
An integrated circuit comprising:
- a plurality of transponder channel circuits;
- a plurality of transponder antenna circuits, each coupled to a respective one of the transponder channel circuits;
- and
- a shared capacitor circuit including:
- a variable capacitor device including a plurality of capacitors;
- a switching circuit to selectively connected the variable capacitor device to a selected one of the transponder channel circuits;
- and
- a control circuit to control the variable capacitor device to provide a selected capacitance, the control circuit including a plurality of switches, each switch being individually controllable and coupled to a respective one of the capacitors, and wherein the control circuit is configured to control selected ones of the switches to a closed state, and the respective capacitor coupled to each of the selected ones of the switches is electrically connected to an input of the selected one of the transponder channel circuits.
Dependencies are inferred from the claim text.