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US 4,511,852 AGranted
Differential amplifier having balanced output
AssigneeHazeltine Corporation
InventorsKenneth J. Henrich, Thomas C. Hana
Life of this patent
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Abstract
A classical differential amplifier provides outputs of unequal magnitude due to its emitter resistance being finite. In order to equalize its output, a voltage follower circuit is associated with each of the inputs of the differential amplifier. The output of each voltage follower circuit is converted to a current and subtracted from one of the outputs of the differential amplifier. Subtracting the outputs results in a differential amplifier with both outputs being substantially equal.
Claims15
An apparatus comprising:
- a. A differential amplifier having a gain with first and second inputs and first and second outputs;
- b. A first voltage follower circuit having a first amplifier, said first circuit associated with the first input and having an output;
- c. A second voltage follower circuit having a second amplifier, said second circuit associated with the second input and having an output;
- d. First means for summing having inputs associated with the first output of the differential amplifier and the output of the first voltage follower circuit, and having an output providing a voltage substantially representing the sum of the outputs associated with its inputs;
- e. Second means for summing having inputs associated with the second output of the differential amplifier and the output of the second voltage follower, and having an output providing a voltage substantially representing the sum of the outputs associated with its inputs, whereby the grounding of the first input of the differential amplifier and applying a positive voltage to the second input of the differential amplifier results in the output of the first means providing a voltage substantially equal to the output of the second means.
2 more elements
Dependencies are inferred from the claim text.