H - Electricity – 03 – K
Patent
H - Electricity
03
K
328/196
H03K 17/62 (2006.01) H03K 17/60 (2006.01)
Patent
CA 1135799
10-12-1979 1 PHN 9353 ABSTRACT: "Switching circuit comprising a plurality of input channels and an output channel" A switching circuit in which one out of a plurality of input channels is connectable to an output channel via one of the switching devices in the circuit. Each of the switching devices comprises an emitter-coupled pair of transistors which have a switchable current source in the emitter lead, the base of the first and the second tran- sistor, respectively, of each pair being connected to one of the inputs and to the output, respectively. The output channel of the circuit comprises a transistor the emitter of which is connected to the output and the base to the interconnected collectors of the second transistors, this junction point being connected to a voltage-carrying ter- minal via a resistor. Via a selection switch which is con- nected to the switchable current sources only one of the input channels can at all times be connected through to the output channel. To increase the cross-talk attenuation, the non-conducting current sources are driven to the saturated state, non-conduction being ensured by limiting the maximum and minimum value, respectively, of the input signal with respect to the current source switching voltage.
345686
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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