Clock recovery system and method for near field communication with active load modulation
AssigneeMaxim Integrated Products, Inc.
InventorsJonathan C.H. HUNG, Thomas Michael MAGUIRE
Life of this patent
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Abstract
A system includes a tank circuit, a synchronization circuit, a transmitter, and a control circuit. The tank circuit is configured to receive a first signal transmitted from a near field communication reader. The synchronization circuit is configured to synchronize a clock to the first signal. The transmitter is configured to transmit data using the clock from the tank circuit to the near field communication reader using active load modulation. The control circuit is configured to disable the synchronization circuit during a modulation period of the active load modulation and to reduce energy remaining in the tank circuit at an end of the modulation period.
Claims22
A system comprising:
- a tank circuit to receive a first signal transmitted from a near field communication reader;
- a synchronization circuit to synchronize a clock to the first signal;
- a transmitter to transmit data using the clock from the tank circuit to the near field communication reader using active load modulation;
- and
- a control circuit to disable the synchronization circuit during a modulation period of the active load modulation and to reduce energy remaining in the tank circuit at an end of the modulation period.
A method comprising:
- receiving, at a tank circuit, a first signal transmitted from a near field communication reader;
- synchronizing a clock to the first signal;
- transmitting data using the clock from the tank circuit to the near field communication reader using active load modulation;
- disabling the synchronizing during a modulation period of the active load modulation;
- and
- reducing energy remaining in the tank circuit at an end of the modulation period.
Dependencies are inferred from the claim text.