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US 2007/0176706 A1Published application
Apparatus and method for adaptive demodulation of PWM signal
AssigneeSamsung Electronics Co., Ltd.
InventorEui-Seung Kim
Life of this patent
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Abstract
A demodulator for processing a PWM (pulse width modulation) signal includes a variable capacitor, a charging unit, a discharging unit, and a tuner. The charging and discharging units charge or discharge the variable capacitor depending on the PWM signal. The tuner determines a capacitance of the variable capacitor and a discharge current of the discharging unit for proper operation of the demodulator in various RF environments.
Claims20
A demodulator for processing a PWM (pulse width modulation) signal, the demodulator comprising:
- a variable capacitor;
- a charging unit for charging the variable capacitor when the PWM signal is at a first logic level;
- a discharging unit for discharging the variable capacitor when the PWM signal is at a second logic level;
- a sampler for generating a sampled data from a voltage at the variable capacitor;
- and
- a tuner for determining a final capacitance of the variable capacitor and a final discharge current of the discharging unit resulting in the sampled data having a desired bit pattern.
3 more elements
A smart card comprising:
- a contact-less interface for receiving a PWM (pulse width modulation) signal transmitted from a reader;
- and
- a demodulator for processing the PWM signal, the demodulator including:
- a variable capacitor;
- a charging unit for charging the variable capacitor when the PWM signal is at a first logic level;
- a discharging unit for discharging the variable capacitor when the PWM signal is at a second logic level;
- a sampler for generating a sampled data from a voltage at the variable capacitor;
- and
- a tuner for determining a final capacitance of the variable capacitor and a final discharge current of the discharging unit resulting in the sampled data having a desired bit pattern.
6 more elements
A method of demodulating a PWM (pulse width modulation) signal, comprising:
- charging a variable capacitor when the PWM signal is at a first logic level;
- discharging the variable capacitor when the PWM signal is at a second logic level;
- generating a sampled data from a comparison of a voltage at the variable capacitor with a reference voltage;
- and
- determining a final capacitance of the variable capacitor and a final discharge current for discharging the variable capacitor that results in the sampled data having a desired bit pattern.
2 more elements
Dependencies are inferred from the claim text.