Wave transmission lines and networks – Coupling networks – Equalizers
Patent
1990-11-28
1992-09-01
Gensler, Paul
Wave transmission lines and networks
Coupling networks
Equalizers
333171, H03H 703, H03H 707
Patent
active
051442671
ABSTRACT:
A three terminal compensation network for frequency dependent attenuation has a control terminal, an input terminal, and an output terminal. The network is particularly useful for an off-premises CATV system for slope compensation of a broadband television signal. The control terminal is supplied with a voltage indicative of the amount and direction of the slope in the actual television signal. The voltage oppositely biases a set of diodes which are used as controlled resistances in a pair of tuned circuits in the network. One series tuned circuit provides for varying degrees of negative slope compensation and a parallel tuned circuit provides for varying degrees of positive slope compensation. The network elements are connected in a modified bridge T configuration such that the characteristic impedance of the CATV system (75 ohms) can be approximately matched for the input and output of the broadband television signal.
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Gensler Paul
Marvin William A.
Scientific-Atlanta, Inc.
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