Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
186 words
A constant current source circuit for providing a current to a load comprising: a power source voltage supply terminal which is designed to receive a DC power source voltage; a reference potential terminal; a current source; a first transistor connected at its collector to said power source voltage supply terminal via said current source and at its emitter to said reference potential terminal; a current mirror circuit; a second transistor connected at its collector to the base of said first transistor via said current mirror circuit and at its emitter to said reference potential terminal, the base of said second transistor being connected to the collector of said first transistor, to effect a closed feedback loop through said second transistor, said mirror circuit and said first transistor for maintaining a constant current to the load; and a third transistor connected between said power source voltage supply terminal and said reference potential terminal via output terminals to which the load is designed to be connected, the base of said third transistor being connected to be driven by a current proportional to a current of said second transistor.
Claim 2
Dependent Claim
186 words
A constant current source circuit for providing a current to a load comprising: a power source voltage supply terminal which is designed to receive a DC power source voltage; a reference potential terminal; a current source; a first transistor connected at its collector to said power source voltage supply terminal via said current source and at its emitter to said reference potential terminal; a current mirror circuit; a second transistor connected at its collector to the base of said first transistor via said current mirror circuit and at its emitter to said reference potential terminal, the base of said second transistor being connected to the collector of said first transistor, to effect a closed feedback loop through said second transistor, said mirror circuit and said first transistor for maintaining a constant current to the load; and a third transistor connected between said power source voltage supply terminal and said reference potential terminal via output terminals to which the load is designed to be connected, the base of said third transistor being connected to be driven by a current proportional to a current of said second transistor.
Claim 3
Dependent Claim
36 words
A constant current source circuit according to claim 1, wherein said second and third transistors are of the same polarity, and the base of said third transistor is connected to the base of said second transistor.
Claim 4
Dependent Claim
35 words
A constant current source circuit according to claim 1, wherein said second and third transistors are of opposite polarity, and the base of said third transistor is connected to the collector of said second transistor.
Claim 5
Dependent Claim
23 words
A constant current source circuit according to claim 1, wherein said third transistor has a greater base-emitter junction area than said second transistor.
Claim 6
Dependent Claim
23 words
A constant current source circuit according to claim 2, wherein said third transistor has a greater base-emitter junction area than said second transistor.
Claim 7
Dependent Claim
23 words
A constant current source circuit according to claim 3, wherein said third transistor has a greater base-emitter junction area than said second transistor.