U.S. Philips Corporation

Manfred Biehl

Winfried B Jansen

Burkhard Dick

Peter Wiese

Ralf Pilaski

Norbert Wirges

Bernd Pille

Production of a frequency control signal in an FSK receiver

A description is given of a circuit arrangement comprising

Circuit arrangement with a filter quadripole

A circuit arrangement includes a differential amplifier having two output terminals for supplying two output signals which each have a signal component which is variable about a reference level and is in phase opposition to the other signal component (push-pull signal). A significant improvement of the common-mode rejection is obtained by means of a control circuit adapted to form a sum signal from the output signals, to form a difference signal from the sum signal and a reference signal, and to control the reference level of the two push-pull signals in dependence upon the difference signal.

Circuit arrangement comprising a differential amplifier

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Norderstedt, Germany

Manfred Biehl