Compensation amplification circuit for installation in a transmission line between a mobile device located in a motor vehicle or a motor vehicle side recording for the mobile device on the one hand and an antenna of the motor vehicle on the other hand and method for operating a corresponding bidirectional compensation amplification circuit

摘要

A compensation amplification circuit (1) is provided for installation in a transmission line between a mobile device located in a motor vehicle or a vehicle-side receptacle (2) for the mobile device on the one hand and an antenna (3) of the motor vehicle on the other hand. The compensation amplification circuit (1) has a reception amplification device (7) by means of which a reception signal received via the antenna (2) of the motor vehicle and which can be supplied to the mobile radio by the transmission line can be amplified, a transmission amplification device (17) by means of which a signal transmitted by the mobile radio device and transmitted through the A transmission device (15, 16) by means of which an operating state of the mobile device located in the motor vehicle can be detected and processed into a detector signal, a selection device (4, 5), by means of which Operating state of the compensation amplification circuit (1) to the operating state of the mobile device located in the motor vehicle is adaptable, and an evaluation device (8), by means of which the detector signal detectable and by means of the selection device (4, 5) in response to the detector design al is influenced. In order to provide a compensation amplification circuit, by means of which a large number of frequency bands can be supported without great technical-cosntructive effort, it is proposed that the selection device (4, 5) has filters with adaptable transmission characteristics and that the transmission characteristics of the filters are determined by means of the evaluation device (8 ) are adjustable according to the detector signal.