Portable object inductively coupled to a fixed station and comprising gain control means
First Claim
1. A portable object comprising:
- an antenna inductively coupled to a fixed station of a remote transmission device,a variable load impedance with a control terminal,a rectifier connected in parallel to terminals of the antenna,a gain control means receiving signals representative of a difference between a setpoint voltage and an output voltage of the rectifier,a one-bit analog-to-digital converter,command means of integrator type comprising a gain control input connected to an output of said gain control means and an output connected to the control terminal of the variable load impedance,demodulation means connected to the converter output.
1 Assignment
0 Petitions
Accused Products
Abstract
The portable object is equipped with an antenna inductively coupled to a fixed station of a remote transmission device. The portable object comprises a variable load impedance and a rectifier connected in parallel to the terminals of the antenna, a regulation loop of the voltage at the terminals of the load impedance, connected between the output of the rectifier and a control terminal of the load impedance. The regulation loop comprises, in series, means for determining a difference between a setpoint voltage and the output voltage of the rectifier, a one-bit analog-to-digital converter, and command means of integrator type. The command means comprise a gain control input connected to an output of the gain control means receiving on input signals representative of the difference. Demodulation means are connected to the output of the converter.
7 Citations
5 Claims
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1. A portable object comprising:
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an antenna inductively coupled to a fixed station of a remote transmission device, a variable load impedance with a control terminal, a rectifier connected in parallel to terminals of the antenna, a gain control means receiving signals representative of a difference between a setpoint voltage and an output voltage of the rectifier, a one-bit analog-to-digital converter, command means of integrator type comprising a gain control input connected to an output of said gain control means and an output connected to the control terminal of the variable load impedance, demodulation means connected to the converter output. - View Dependent Claims (2, 3, 4, 5)
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Specification