Emitting device with low noise, high efficiency and variable power for RFID reader/writer

摘要

The low noise transmission device is provided with high efficiency and variable modulation factor for a read or write station of a Radio frequency identificationsystem that consists of a transmission stage, which is formed as E-end stage and a control device of the transmission stage. The modulation of the transmission signal is carried out through modulation of a driver load voltage (U4). A driver device (35) is formed as a driver device provided with two separate direct current voltage sources. The driver device has two parallelly connected drivers (D2,D3).