Low power regulated amplifier for a transponder

Details Low power regulated amplifier for a transponder Low power regulated amplifier for a transponder

2006-01-03

2006-01-03

Horabik, Michael (Department: 2635)

Communications: electrical

Selective

Interrogation response

C340S010520, C455S245100, C455S248100, C455S106000

Reexamination Certificate

active

06982627

ABSTRACT:
A transponder (1) comprising an antenna (4), a demodulator (5) and a signal processing circuit (6) which converts a modulated signal received via the antenna (4) into a signal suitable for processing in the demodulator (5). The signal processing circuit (6) comprises an amplifier (7) with a predefined amplification factor and a closed loop control circuit (8) serving to maintain the voltage swing of the processed signal applied at the input of the demodulator (5) substantially constant. In a preferred embodiment the closed loop control circuit comprises a capacitor which is continually discharged and differingly charged as a function of the strength of the output signal of the amplifier of the signal processing circuit, the voltage resulting across the capacitor controlling a controllable resistor connected in parallel to the input of the signal processing circuit and forming with a coupling capacitor a voltage divider.

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