FREQUENCY CHARACTERISTIC ADJUSTMENT CIRCUIT FOR CATV LINE AMPLIFIER

摘要

PURPOSE: To configure an equalizer circuit or a tilt circuit by forming a common circuit section to a printed circuit board and having only to change circuit components to be added to the common circuit section. CONSTITUTION: Input output terminal patterns 3, 4, an earth terminal pattern 9 and connection terminal patterns 5, 6, 7 are formed to a printed circuit board 1, resistors R1, R2 are connected in series between the input output terminal patterns 3, 4, and resistors R3, R4 connecting in series via the connection terminal pattern 6 are connected in parallel with the resistor R2. A coil L1 is connected in parallel with the resistor R2 and an equalizer circuit is formed by connecting a coil L3 and a capacitor C2 in series between the connection part of the resistors R3, R4 and the earth pattern 9 and a tilt circuit is formed by connecting a capacitor C1 in parallel with the resistor R2 and connecting a coil L2 between the connection part of the resistors R3, R4 and the earth terminal pattern 9.