Deutsche Thomson-brandt Gmbh

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Martin Rieger

To improve the regulation (gain control) characteristics of a controllable amplifier, a negative feedback network in a differential amplifier is subdivided into individual networks supplied each with its own control current. In order to reduce distortion caused by non-linear sections contained in the networks or to increase intermodulation resistance, the individual control currents are reduced with an increasing input voltage. To obtain a dB-linear regulation characteristic the control currents may be proportioned, for example, in accordance with tangential-hyperbolic characteristic curves.

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Wolfsburg, Germany

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