Abstract: A symmetrical amplifier includes a current mirror circuit and a current splitting circuit. The current splitting circuit splits up an input signal applied to the amplifier as a function of the signal polarity. Negative input currents are applied to the current mirror circuit whose controlled output current is applied to a control input of a first current amplifier circuit arranged in the amplifier. In order to insure symmetrical operation of the amplifier, positive input currents flowing into the amplifier are applied to a control input of a second current amplifier circuit arranged in the amplifier. The second current amplifier circuit is the same as the first current amplifier circuit. The first current amplifier circuit is connected to a positive supply voltage and the second current amplifier circuit is connected to a negative power supply voltage, and the two current amplifier circuits operate into a common load at their output ends.

Abstract: An integrated circuit or other semiconductor device, comprises a semiconductor body with a bipolar transistor consisting of electrically parallel transistor structures at least a number of which have a different value of emitter series resistance. The transistor emitter zone comprises a number of active emitter regions which constitute the emitters of the different transistor structures, a number of emitter contact regions contacted by emitter metallization via emitter contact windows, and a number of emitter connection regions which interconnect the emitter contact regions and the active emitter regions. The different values of emitter series resistance of the transistor structures are realized by having a different size or location with respect to the emitter connection regions for at least a number of the emitter contact windows, without necessitating a variation of the emitter zone geometry for each transistor structure.

Abstract: In order to enhance the sharpness of edges, the incoming video signal, for example a color-difference signal, is stored upon the occurrence of an edge until the end of the transition with the value occuring before the edge appeared. The transition interval is determined in that the video signal is differentiated and passed through a threshold device. At the end of the transition interval, a change-over is effected to the new signal value.

Abstract: A circuit for transmitting in opposite directions two pulse-shaped signals via one connecting terminal(K) of a semiconductor body. When one signal is transmitted the signal path for the other signal is inhibited, which is accomplished by means of switching means (1, 2, 3, 4). A possible use of said circuit is one in which, via the same connecting terminal, a synchronizing signal for synchronizing the field deflection in a television receiver is first applied to the semiconductor body and a blanking pulse is produced from said body thereafter.

Abstract: A sawtooth voltage oscillator synchronizable by synchronizing pulses, a capacitor being charged and discharged, respectively, between two threshold values. The free-running frequency of the oscillator is switchable under the influence of a synchronizing signal detector which establishes the frequency of the synchronizing signal.

Abstract: To obtain a protection signal, an additional blanking signal is generated during field blanking, this signal being cancelled before the end of the blanking period of the circuit functions in a normal manner. Consequently, checking the proper operation takes place instantaneously in every period and without an external capacitor. If field retrace pulses are absent the electron beam in the picture tube is permamently cut off.