Equalization amplifier

Details Equalization amplifier Equalization amplifier

1981-12-18

1984-07-10

Mullins, James B.

Amplifiers

Signal feedback

Phase shift means in loop path

330151, 330304, 333 28R, 360 65, H03F 100

Patent

active

044595549

ABSTRACT:
An equalization amplifier (30) is disclosed which includes two amplifier stages (32, 34) connected in cascade. The first amplifier stage (32) includes a low pass filter amplifier (40) having a pole frequency of F1 and a feed forward path (36) bypassing the low pass filter amplifier. The feed forward path provides the input signal to an adder circuit (42) where it is added to the output of the low pass filter amplifier. The effect of this addition is to provide the first amplifier with a zero frequency of F2, where F2 is greater than F1. The resulting sum signal is applied to the second amplifier stage (34) which also has a low pass filter characteristic. The second filter has a pole frequency of F3, where F3 is greater than F2. The equalization amplifier is particularly useful for providing RIAA equalization of phono cartridge output signals.

REFERENCES:
patent: 3533004 (1970-10-01), Embley
patent: 4293819 (1981-10-01), Shibayama et al.
Operational Amplifiers, Burr-Brown, (McGraw-Hill, 1971), pp. 183-186.

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