Television intermediate frequency amplifier

Details Television intermediate frequency amplifier Television intermediate frequency amplifier

H - Electricity

03

G

330/31

H03G 3/30 (2006.01)

Patent

CA 1168320

RCA 74,957 Abstract of the Disclosure An I.F. amplifier system is provided in which gain control is accomplished by varying the A.C. impedances of variable impedance devices, which devices are coupled as load and emitter degeneration impedances for amplifying transistors. Variable D.C. gain control currents are applied to the variable impedance devices to vary their impedance. When coupled as collector loads, gain control is achieved by varying the load lines of the amplifiers. When coupled as emitter impedances, gain control is achieved through variable emitter degeneration. These two techniques of gain control are employed in respective different amplifying stages, which reduces the maximum amount of gain control current required at any particular point in the gain control process, thereby reducing the power consumption of the system.

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