On-chip stimulus generation for test and calibration of NFC reader receivers
First Claim
1. A method of determining a calibration of a near field communication, NFC, device, the NFC device comprising a receiver circuit, a transmitter circuit and a load modulator circuit, the method comprising:
- activating a calibration mode in which the load modulator circuit is configured to be operational concurrently to each of the receiver circuit and the transmitter circuit;
generating a carrier signal in the transmitter circuit,generating a modulation signal in the load modulator circuit by switching a resistance in the load modulator circuit to a resistance that is lower than a resistance in the load modulator circuit when the NFC device is operating in a card emulator mode,generating a modulated carrier signal, comprising first and second frequencies, by applying the modulation signal to the carrier signal,applying the modulated carrier signal at an input of the receiver circuit, anddetermining a response parameter of the receiver circuit on the basis of the response of the receiver circuit to the first and second frequencies in the modulated carrier signal.
4 Assignments
0 Petitions
Accused Products
Abstract
A method of determining a calibration of a near field communication, NFC, device, the NFC device comprising a receiver circuit, a transmitter circuit and a load modulator circuit, the method comprising: generating a carrier signal in the transmitter circuit, generating a modulation signal in the load modulator circuit, generating a modulated carrier signal, comprising first and second frequencies, by applying the modulation signal to the carrier signal, applying the modulated carrier signal at an input of the receiver circuit, and determining a response parameter of the receiver circuit on the basis of the response of the receiver circuit to the first and second frequencies in the modulated carrier signal.
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Citations
12 Claims
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1. A method of determining a calibration of a near field communication, NFC, device, the NFC device comprising a receiver circuit, a transmitter circuit and a load modulator circuit, the method comprising:
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activating a calibration mode in which the load modulator circuit is configured to be operational concurrently to each of the receiver circuit and the transmitter circuit; generating a carrier signal in the transmitter circuit, generating a modulation signal in the load modulator circuit by switching a resistance in the load modulator circuit to a resistance that is lower than a resistance in the load modulator circuit when the NFC device is operating in a card emulator mode, generating a modulated carrier signal, comprising first and second frequencies, by applying the modulation signal to the carrier signal, applying the modulated carrier signal at an input of the receiver circuit, and determining a response parameter of the receiver circuit on the basis of the response of the receiver circuit to the first and second frequencies in the modulated carrier signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A near field communication, NFC, device, comprising a receiver circuit, a transmitter circuit and a load modulator circuit, wherein the device is configured to:
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activate a calibration mode in which the load modulator circuit is configured to be operational concurrently to each of the receiver circuit and the transmitter circuit; generate a carrier signal in the transmitter circuit, generate a modulation signal in the load modulator circuit by switching a resistance in the load modulator circuit to a resistance that is lower than a resistance in the load modulator circuit when the NFC device is operating in a card emulator mode, generate a modulated carrier signal, comprising first and second frequencies, by applying the modulation signal to the carrier signal, apply the modulated carrier signal at an input of the receiver circuit, and determine a response parameter of the receiver circuit on the basis of the response of the receiver circuit to the first and second frequencies in the modulated carrier signal. - View Dependent Claims (11)
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12. A non-transitory computer readable medium comprising a computer program product, which comprises computer readable instructions which, when run on a computer system, cause the computer system to:
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activate a calibration mode in which the load modulator circuit is configured to be operational concurrently to each of the receiver circuit and the transmitter circuit; generate a carrier signal in the transmitter circuit, generate a modulation signal in the load modulator circuit by switching a resistance in the load modulator circuit to a resistance that is lower than a resistance in the load modulator circuit when the NFC device is operating in a card emulator mode, generate a modulated carrier signal, comprising first and second frequencies, by applying the modulation signal to the carrier signal, apply the modulated carrier signal at an input of the receiver circuit, and determine a response parameter of the receiver circuit on the basis of the response of the receiver circuit to the first and second frequencies in the modulated carrier signal.
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Specification