Near field communication method and transceiver with clock recovery
AssigneeSamsung Electronics Co., Ltd.
InventorsSeong Joong Kim, Joonseong Kang
Life of this patent
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Abstract
A near field communication (NFC) transceiver includes a receiver, a transmitter, and a clock recovery circuit. The receiver is configured to recover a reception (RX) frame encoded with power supply information and information transmitted from a reader to a tag. The transmitter is configured to recover a transmission (TX) frame by a subcarrier load modulation scheme for information transmitted from the tag to the reader. The clock recovery circuit is configured to recover a carrier signal of the TX frame as a baseband clock signal of the NFC transceiver through a rail-to-rail boosting.
Claims18
A near field communication (NFC) transceiver, comprising:
- a receiver, configured to recover a reception (RX) frame encoded with power supply information and information transmitted from a reader to a tag;
- a transmitter, configured to recover a transmission (TX) frame by a subcarrier load modulation scheme for information transmitted from the tag to the reader;
- and
- a clock recovery circuit configured to recover a carrier signal of the TX frame as a baseband clock signal of the NFC transceiver through a rail-to-rail boosting, while selectively turning off a phase-locked loop (PLL) depending on an operation mode of the NFC transceiver
- wherein the clock recovery circuit is further configured to:
- select a signal from an oscillating signal output through a first path passing through a first comparator and the PLL that is based on an oscillator (OSC) and the carrier signal of the TX frame output through a second path through the rail-to-rail boosting by a second comparator, based on one of a TX mode in which the TX frame is recovered, an RX mode in which the RX frame is received and a pooling mode in which the NFC transceiver retrieves a target tag;
- and
- output the selected signal as the baseband clock signal.
A near field communication (NFC) transceiver apparatus, comprising a clock recovery circuit configured to:
- inhibit a supply of power for a generation of an oscillating signal;
- recover a carrier signal of a transmission (TX) frame as a baseband clock signal of an NFC transceiver through a rail-to-rail boosting, while selectively turning off a phase-locked loop (PLL) depending on an operating mode of the NFC transceiver;
- select a signal from an oscillating signal output through a first path passing through a first comparator and the PLL that is based on an oscillator (OSC) and the carrier signal of the TX frame output through a second path through the rail-to-rail boosting by a second comparator, based on one of a TX mode in which the TX frame is recovered, an RX mode in which the RX frame is received and a pooling mode in which the NFC transceiver retrieves a target tag;
- and
- output the selected signal as the baseband clock signal.
A method of a near field communication (NFC) transceiver, the method comprising:
- recovering a reception (RX) frame encoded with power supply information and information transmitted from a reader to a tag, or recovering a transmission (TX) frame by a subcarrier load modulation scheme for information transmitted from the tag to the reader;
- and
- recovering a carrier signal of the TX frame to a baseband clock signal of the NFC transceiver through a rail-to-rail boosting, while selectively turning off a phase-locked loop (PLL) depending on an operation mode of the NFC transceiver,
- wherein the recovering of the carrier signal of the TX frame comprises:
- receiving a mode selection signal based on one of a TX mode in which the TX frame is recovered, an RX mode in which the RX frame is received, and a pooling mode in which the NFC transceiver retrieves a target tag;
- selecting a signal from an oscillating signal output through a first path passing through a first comparator and the PLL that is based on the OSC and the carrier signal of the TX frame output through a second path through the rail-to-rail boosting by a second comparator, based on the mode selection signal;
- and
- outputting the selected signal as the baseband clock signal.
Dependencies are inferred from the claim text.