Apparatuses and methods involving signal transformation for single-ended coupling
AssigneeNXP B.V.
InventorsErich Merlin, Manoj Kurvathodil
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Abstract
In one example, the present disclosure includes a circuit-based apparatus including a resonance tank circuit, a signal source, and a single-ended circuit. The signal source provides a plurality of complementary signals (e.g., differential signals) for processing by the resonance tank circuit where the complementary signals are combined to a signal at a node for presentation to the single-ended circuit (e.g., antenna or receiver). For example, the resonance tank circuit, which has a resonance frequency set for a transfer of power to the load and which may be impedance matched to the single-ended circuit, converts the complementary signals to the node for carrying the signal to the single-ended circuit.
Claims20
An apparatus comprising:
- a resonance tank circuit, having a resonance frequency set for a transfer of power from a signal source, for conversion between a plurality of complementary signals and a signal at a node for carrying the signal towards a single-ended circuit, wherein the single-ended circuit includes or corresponds to an antenna, and the resonance tank circuit is to convert the plurality of complementary signals for the transfer of power to an antenna while the resonance tank circuit transforms a source side of the resonance tank circuit, having a low voltage and low impedance source, to an equivalent high voltage high impedance node at a tap point on an output side of the resonance tank circuit.
An apparatus comprising a resonance tank circuit, having a resonance frequency set for a transfer of power from a signal source, for conversion between a plurality of complementary signals and a signal at a node for carrying the signal towards a single-ended circuit, further including a NFC (near-field communication) circuit having a port for receiving a single-ended signal coupled to a tap point in a path that is connected to the resonance tank circuit, and having a pair of differential signal outputs providing the plurality of complementary signals, wherein an effective complex impedance is presented to the pair of differential signal outputs, and the apparatus further includes setting or tuning values of components via an impedance matching process to cause a complex conjugate load presented to the pair of differential signal outputs, whereby ZmatchTX1-GND is equal to Z*matchTX2-GND.
An apparatus comprising:
- a parallel-arrangement of resonance tank circuits including
- a first resonance tank circuit having a resonance frequency set for a transfer of power from a signal source, for conversion between a plurality of complementary signals and a signal at a first node for carrying the signal towards a first single-ended circuit;
- a second resonance tank circuit having a resonance frequency set for a transfer of power from a signal source, for conversion between a plurality of complementary signals and a signal at a second node for carrying the signal towards a second single-ended circuit, wherein at least one of the first single-ended circuit or the second single-ended circuit includes or corresponds to an antenna, and that at least one of the first resonance tank circuit or the second resonance tank circuit is to convert the plurality of complementary signals for the transfer of power to an antenna while at least one of the first resonance tank circuit or the second resonance tank circuit transforms a source side of at least one of the first resonance tank circuit and the second resonance tank circuit, having a low voltage and low impedance source, to an equivalent high voltage high impedance node at a tap point on an output side of at least one of the first resonance tank circuit or the second resonance tank circuit;
- and
- a transceiver circuit that functions as a source of the plurality of complementary signals for the first resonance tank circuit and functions as a load to receive a single-ended signal from an output of the second one of the resonance tank circuits.
A method comprising:
- converting, via a resonance tank circuit having a resonance frequency set for a transfer of power in the plurality of complementary signals, between a plurality of complementary signals and a signal at a node, and carrying the signal towards a single-ended circuit, wherein the single-ended circuit includes or corresponds to an antenna, and the resonance tank circuit is to convert the plurality of complementary signals for the transfer of power to an antenna while the resonance tank circuit transforms a source side of the resonance tank circuit, having a low voltage and low impedance source, to an equivalent high voltage high impedance node at a tap point on an output side of the resonance tank circuit.
Dependencies are inferred from the claim text.