Analog Devices Global

Panthronics Ag

Jan Crols

Patrick Joseph Pratt

Eoin Edward English

John Anthony Cleary

Jakob Jongsma

Michael Pieber

Tomaz Felicijan

Christian Steffen Birk

Elizabeth A Lillis

David Sayago Montilla

Padraig O'Connor

Kathleen Embrechts

Wim Rens

Steven Gabriels

Hamzeh Nassar

A digital power amplifier comprises: an integrated circuit (IC2); an adaption circuit of discrete components connected to first and second transmission output pins of an integrated circuit to adapt the output signal and feed a substantial sinusoidal output current with a transmission resonance frequency to an RFID antenna. IC2 comprises a digital control section with N wave-forming contacts to output a digital wave-forming bit combination of N bits with a clock frequency M-times the transmission resonance frequency; N driver blocks each connected with a first contact to one of the wave-forming contacts and N/2 of them connected with a second contact to the first transmission output pin and the other N/2 of them connected with their second contact to the second transmission output pin. The driver blocks provide increments of the substantial sinusoidal output current to the first and second transmission output pins.

High-voltage digital power amplifier with sinusoidal output for RFID

Embodiments of the present invention may provide a method of measuring an unknown capacitance of a device. The method may comprise the steps of driving a test signal to a circuit system that includes a current divider formed by the device with unknown capacitance and a reference capacitor; mirroring a current developed in the reference capacitor to a second circuit system that includes a measurement impedance; measuring a voltage within the second circuit system; and deriving a capacitance of the unknown capacitance based on the measured voltage with reference to a capacitance of the reference capacitor and the measurement impedance.

Capacitance measurement

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Oud-Heverlee, Belgium

Jan Crols