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US 3,938,055 AGranted
High performance differential amplifier
AssigneeAeronutronic Ford Corporation (formerly Philco-Ford Corporation)
InventorFrederick T. Buhler
Life of this patent
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Abstract
A differential amplifier having very high common mode rejection is shown. In its simple form four transistors and three constant current sources are connected into a balanced configuration. Balance is automatic so that special component selection is not required.
Claims5
A differential amplifier comprising an input pair of transistors connected as base driven common emitter amplifiers, said input pair having the emitter of each element connected to a separate one of a first pair of constant current sources, said first pair of sources having equal current characteristics,
- an output pair of transistors connected as common base transistors emitter driven from the collectors of said input pair, the base electrodes of said output pair being connected together and supplied from a constant current source independent from said first pair of constant current sources,
- a matched pair of resistors elements series connected between the emitter electrodes of said input pair, and
- a resistor connected between the juncture of said matched pair of resistors and the base electrodes of said output pair.
Dependencies are inferred from the claim text.