Electronic closing system for use as e.g. door closing system for access authorization of passenger car, has delta-sigma fractional N-phase locked loop synthesizer with quartz crystal for adjusting preset transmission frequency of channel

摘要

The system (3) has a device (4) formed as a controlling device, and another device (5) formed as an electronic key of an identification sensor. A transmitting channel operates a transmitter, and electromagnetic signals (7) transmitted between the transmitter and a receiver are coded operating signals for authenticating the latter device such that change of a condition of the former device is activated after positive evaluation of the operating signals. A delta-sigma fractional N-phase locked loop (PLL) synthesizer with a quartz crystal adjusts preset transmission frequency of the channel.