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US 4,156,854 AGranted
Differential amplifier balancing system
AssigneeBell Telephone Laboratories, Incorporated
InventorDavid R. Weller
Life of this patent
Estimating the term…
Abstract
Complementary outputs of a differential amplifier are individually peak detected and the resulting signals are applied to the amplifier differential input in a manner to cause the output peak excursions to have substantially the same direct current levels. This causes the crossover of the two outputs to occur at the midpoint of the signal swing regardless of the input signal peak-to-peak swing, at whatever level.
Claims11
In combination
- a differential amplifier having complementary outputs subject to noninformational signal effects that cause those outputs to experience signal excursions with different direct current peak amplitudes for a predetermined common signal excursion direction, and
- means, responsive to peak excursions in said predetermined direction of said complementary outputs, for applying signals to an input of said amplifier to reduce the difference between those peak amplitudes.
In combination,
- a differential amplifier having complementary outputs which nominally exhibit substantially equal direct current peak amplitudes in a predetermined common direction in response to amplifier input binary signals of opposite binary signal states, respectively, but which amplifier is subject to noninformational signal effects that cause those outputs to experience signal excursions with different direct current peak amplitudes for said comon direction,
- said amplifier having at least an input differential amplification stage, and
- means, responsive to peak signal excursions in said predetermined direction of said complementary outputs, for separately coupling signals representing the peak amplitudes of said complementary outputs to different input connections, respectively, of said amplification stage to reduce the difference between those peak amplitudes.
Dependencies are inferred from the claim text.