Patent Number: 6,167,094

Title: Data transmission circuit having a station and a response circuit

Abstract: A data transmission circuit having a station and a response circuit. The station has an amplitude demodulator as well as a primary coil with a signal generator for producing an alternating magnetic field at a carrier frequency. The response circuit has a secondary coil as well as an amplitude modulator for influencing a load on the secondary coil, and the amplitude modulator is configured such that the alternating magnetic field can be modulated with a data signal. Particularly when the data transmission circuit is mass-produced, situations frequently occur in which the data signal modulated onto the alternating magnetic field by the response circuit can no longer be reconstructed at the station end. The object of the invention is thus to provide a data transmission circuit of this generic type, which always operates reliably. According to the invention, the response circuit has a phase modulator for influencing the electrical characteristics of the secondary coil. The amplitude modulator and/or the phase modulator being configured such that it or they can be driven, in particular, by at least one activation signal.

Inventors: Reiner; Robert (Neubiberg, DE)

Assignee: Siemens Aktiengesellschaft

International Classification: H04B 5/00 (20060101); H04B 003/00 (); H04L 025/00 (); H04L 027/00 ()

Expiration Date: 12/26/2017