Amplifier

Abstract

Abstract PURPOSE: To obtain the amplifier having the gain if f 1/2 to the frequency f, by providing the negative feedback circuit including resistor and inductance between the input and output of the series circuit of amplifier and gain adjustment circuit. CONSTITUTION: At the relay and amplification of CATV, the input signal from the coaxial cable is fed to the terminal 6, it is amplified at the transistor Tr2, and it is connected to the next stage amplifier from the output terminal 20 via the gain adjustment circuit 18. From the terminal 20, the series circuit of the resistor R30 and inductance L32 is connected to the base of Tr2 via the DC blocking capacitor C34 to constitute the negative feedback circuit. By suitably selecting the value of R30 and L32, the variable resistor 22 of the circuit 18 is changed for the gain adjustment depending on the length of coaxial cable, the f 1/2 characteristics depending on the length of coaxial cable can be compensated to establish the amplifier simple in adjustment. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Ichiharu Hayashi

Bibliographic Details