Back to results
US 4,283,673 AGranted
Means for reducing current-gain modulation due to differences in collector-base voltages on a transistor pair
AssigneeSignetics Corporation
InventorJ. Darryl Lieux
Life of this patent
Estimating the term…
Abstract
In a circuit including a transistor pair feeding separate loads at different load voltages, current gain modulation or Early effect is avoided by employing an operational amplifier to maintain the collector-base voltages of the transistors equal and thereby maintain their alpha current gains equal.
Claims4
A transistor circuit, comprising:
- (a) a pair of transistors each having an emitter, base and collector, with their bases connected in common,
- (b) current supply means for supplying substantially equal current to the emitters of said transistors,
- (c) a load coupled separately to each collector of said transistors, and
- (d) means coupled between the collectors of said transistors and between the collector of one of said transistors and the load coupled thereto for maintaining the collector-base voltages of said transistors substantially equal and their current gains substantially equal.
1 more element
Dependencies are inferred from the claim text.