Frequency equalizer

Wave transmission lines and networks – Coupling networks – Equalizers

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Details

330304, H04B 304

Patent

active

049756630

ABSTRACT:
This disclosure depicts an equalizer circuit having input and output terminals and a reference terminal for receiving a reference voltage. The equalizer circuit comprises a first operational amplifier which has a positive input operatively connected to the input terminal and which also has a negative input and an output. A first adjustable resistive means has a first terminal operatively connected to the negative input of the first operational amplifier a second terminal operatively connected to the output of the first operational amplifier has a reference connection operatively connected to the reference terminal and has a third terminal. A second operational amplifier has a positive input operatively connected to the third terminal of the first adjustable resistive means, has a negative input and has an output operatively connected to the output terminal. A second adjustable resistive means has a first terminal operatively connected to the negative input of the second operational amplifier and a second terminal operatively connected to the output of the second operational amplifier, and also has a reference connection connected to the reference terminal.

REFERENCES:
patent: 3526858 (1970-09-01), Heinlein et al.
patent: 3829626 (1974-08-01), Irwin et al.
patent: 4105945 (1978-08-01), Sano et al.
patent: 4117412 (1978-09-01), Holman, II
patent: 4291276 (1981-09-01), Ida
patent: 4354159 (1982-10-01), Schorr et al.
patent: 4490692 (1984-12-01), Schorr

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