DemodulatorThe front end features an envelope ASK demodulator able to detect the on-off keying (OOK) signal provided by the base station. The envelope is tracked on all three channels simultaneously and derived from the three channel demodulation signals a single demodulated signal is provided to the IIU. The demodulator circuitry (Figure 13) has been designed to fit the modulation characteristics as implemented by the NXP transponder families.