Amplitude equalizer using mixing for error detection

Details Amplitude equalizer using mixing for error detection Amplitude equalizer using mixing for error detection

1974-10-29

1976-03-09

Heyman, John S.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

325 42, 325323, 325475, 325477, 328163, H04B 314, H04B 110

Patent

active

039434680

ABSTRACT:
Apparatus for accomplishing amplitude equalization between two input signals includes circuitry for generating the sum and the difference of the two signals, mixing the sum and the difference and applying the low-pass filtered version of the mixed resultant as a feedback error signal of very low frequency to an attenuator associated with one of the two input signals. A hybrid combiner may be used to generate the sum and the difference from the two input signals. The phases of the two input signals are unaffected by the amplitude equalization. A particular application of the invention is in a LIND (linear amplification using nonlinear devices) amplifier such as that disclosed in U.S. Pat. No. 3,777,275 issued Dec. 4, 1973 to D. C. Cox.

REFERENCES:
patent: 3368168 (1968-02-01), Lucky
patent: 3649916 (1972-03-01), Winters
patent: 3676804 (1972-07-01), Mueller
patent: 3708766 (1973-01-01), Sha et al.
patent: 3736414 (1973-05-01), McAuliffe
patent: 3758863 (1973-09-01), Ungerboeck
patent: 3777275 (1973-12-01), Cox
patent: 3787762 (1974-01-01), Sato
patent: 3868603 (1975-02-01), Guidoux

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