Circuit for at least two frequencies
AssigneeLicentia Patent-Verwaltungs-G.m.b.H.
InventorJohann Mattfeld
Life of this patent
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Abstract
A circuit for at least two frequencies comprises a high frequency filter and a low frequency filter and a pair of series connected terminating resistors, the high frequency filter being connected to a first terminating resistor and directly to a common circuit point, the low fequency filter being connected to the connection between the two resistors and the order of magnitude of the terminating resistors being the same as the order of magnitude of the required terminating resistance of the filters.
Claims11
A circuit which is operated alternately with at least two frequencies through a common connection, and using filters, characterized in that the filters are ceramic;
- that two terminating resistors, each connected to a filter, are connected in series with the lower frequency filter connected to the connection point between the two resistors, and the higher frequency filter connected to the lower value resistor of said two resistors and is connected directly to the common circuit connection for both frequencies;
- and that the order of magnitude of said resistors corresponds to the order of magnitude of the required terminating resistance required for the ceramic filters.
A circuit for at least two frequencies comprising a high frequency filter, a lower frequency filter, a first terminating resistor connected to said high frequency filter and of the same order of magnitude as the required terminating resistance of said high frequency filter, a second terminating resistor connected in series with said first terminating resistor and to said lower frequency filter at a connection point between said first and second terminating resistors and of the same order of magnitude as the required terminating resistance of said lower frequency filter and means connecting said high frequency filter directly to a circuit point common to both frequencies.
Dependencies are inferred from the claim text.