Difference amplifier with parallel isolated emitter configuration
Abstract
Abstract A TRANSISTOR DIFFERENCE AMPLIFIER IS DISCLOSED IN WHICH ONE SIDE THEREOF, CALLED SIDE A, CONTAINS A PLURALITY OF R. TRANSISTOR ELEMENTS EQUAL IN NUMBER TO THE TRANSISTOR ELEMENTS IN THE OTHER SIDE, CALLED SIDE B. MOREOVER, EACH OF THE EMITTERS IN SIDE A IS SEPARATELY ELECTRICALLY CONNECTED, THROUGH A RESISTOR FOR EXAMPLE, TO A CORRESPONDING EMITTER IN SIDE B. THE ELECTRICAL MIDPOINT, OR BALANCE POINT, OF THE ELECTRICAL PATH DEFINED BY EACH EMITTER TO EMITTER ACTS AS A VIRTUAL GROUND. THE EXISTENCE OF THE VIRTUAL GROUND PERMITS THE TRANSFER OF EMITTER SIGNAL CURRENT FROM SIDE A TO SIDE B THROUGH N SEPARATE EMITTER TO EMITTER PATHS WITHOUT THE NECESSITY OF PASSING THROUGH AN ACUAL EARTH OR CHASSIS GROUP RETURN PATH, THEREBY ENABLING HIGH POWER HANDLING CAPACITY WHILE MINIMIZING EMITTER CIRCUIT LEAD AND GROUND PLANE INDUCTANCE. IN ADDITION PARASITIC COUPLING TO ADJACENT CIRCUITS THROUGH THE GROUND PLANE IS AVOIDED.
Inventors
- 👤 Robert V Goordman
- 👤 Ronald C Petersen
Bibliographic Details
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