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Smartrac Technology Wehnrath Gmbh

Michal Prazan

Ulrich Friedrich

Lubomir Plavec

Tomas Hrdy

Michal Prokes

Jürgen Fehle

Pavel Holoubek

Ondrej Subrt

The transponder comprises an antenna and a receiver circuit () for receiving RF signals, this receiver circuit is implemented with a control mechanism to activate it at least periodically in a listening mode. This receiver circuit is comprises a decoding circuit (), formed at least by a demodulator () and a decoder (), and a wake-up circuit (B) to analyze received RF signals in the listening mode and arranged for controlling the activation of the decoding circuit in this listening mode. The wake-up circuit comprises a frequency discriminator () and a digital modulation or preamble detector () downstream from a field clock generator (). The wake-up circuit receives as entry an alternating signal branched from the signal chain through the receiver circuit upstream from the demodulator and it activates the decoding circuit only when a modulation or a preamble is detected in a received RF signal by the digital modulation or preamble detector.

Transponder with receiving means having a low electrical consumption in a listening mode

The random number generator comprises a linear feedback shift register (), which comprises a series of storage elements ((),(), . . . ,()), a first input () to receive a clock signal from a clock oscillator (), a feedback line () connecting the output of a last storage element (()) with an input of at least a first storage element (()), a second input () coupled with the feedback line () via at least one cell () and wherein the output of the cell () is coupled to an input of at least one of the storage elements ((),(), . . . ,()).

Random number generator

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Prague, Czechia

Michal Prazan