US4945260A — Temperature and supply compensated ECL bandgap re…

Claim 1

Independent Claim 292 words

An ECL bandgap reference voltage generator for producing an output reference voltage V BB that is compensated for variations in supply voltage, said bandgap generator comprising: bandgap circuit portion means (12), including first and second parallel current branches connected between a first power supply potential and a second power supply potential, said first and second parallel current branches including first and second branch transistors, respectively, (Q902, Q903) for supplying current through the parallel branches, and a constant current source transistor (Q909) having its base coupled to the emitter of one of the first and second branch transistors and its emitter coupled to the second power supply potential, for establishing the output reference voltage B BB ; compensation circuit portion means (14), including a supply-independent current source connected between the first power supply potential and the collector of the constant current source transistor (Q909), for supplying constant current to the collector of the constant current source transistor (Q909) as variations in the supply voltage occur; and said supply-independent current source being formed of a first transistor (Q907), a second transistor (Q908), a first resistor (R903), a second resistor (R904), and a third resistor (R908), said first transistor (Q907) having its collector connected to the base of said second transistor (Q908) and coupled to the first power supply potential via the first resistor (R903), said first transistor (Q907) having its base connected to the emitter of said second transistor (Q908) and coupled to the collector of said constant current source transistor (Q909) via the first resistor (R904), said second transistor (Q907) having its emitter connected to the collector of said constant current source transistor (Q909), said second transistor (Q908) having its collector coupled to the first power supply potential via the third resistor (R908).

Claim 2

Dependent Claim 292 words

An ECL bandgap reference voltage generator for producing an output reference voltage V BB that is compensated for variations in supply voltage, said bandgap generator comprising: bandgap circuit portion means (12), including first and second parallel current branches connected between a first power supply potential and a second power supply potential, said first and second parallel current branches including first and second branch transistors, respectively, (Q902, Q903) for supplying current through the parallel branches, and a constant current source transistor (Q909) having its base coupled to the emitter of one of the first and second branch transistors and its emitter coupled to the second power supply potential, for establishing the output reference voltage B BB ; compensation circuit portion means (14), including a supply-independent current source connected between the first power supply potential and the collector of the constant current source transistor (Q909), for supplying constant current to the collector of the constant current source transistor (Q909) as variations in the supply voltage occur; and said supply-independent current source being formed of a first transistor (Q907), a second transistor (Q908), a first resistor (R903), a second resistor (R904), and a third resistor (R908), said first transistor (Q907) having its collector connected to the base of said second transistor (Q908) and coupled to the first power supply potential via the first resistor (R903), said first transistor (Q907) having its base connected to the emitter of said second transistor (Q908) and coupled to the collector of said constant current source transistor (Q909) via the first resistor (R904), said second transistor (Q907) having its emitter connected to the collector of said constant current source transistor (Q909), said second transistor (Q908) having its collector coupled to the first power supply potential via the third resistor (R908).

Claim 3

Dependent Claim 56 words

A bandgap generator as claimed in claim 1, wherein the current from the emitter of said second transistor (Q907) is minimized with respect to the current flowing through the second resistor (R904) as variations in the supply voltage occur so that the current supplied to the collector of said constant current source transistor (Q909) remains constant.

Claim 4

Dependent Claim 38 words

A bandgap generator as claimed in claim 2, wherein the current flowing through the second resistor (R904) is equal to V BE (Q907) /R904, where V BE (Q907) is the base-emitter voltage drop across the second transistor (Q907).

Claim 5

Dependent Claim 19 words

A bandgap generator as claimed in claim 3, wherein said second and third transistors are of the NPN-type conductivity.

Claim 6

Dependent Claim 60 words

A bandgap generator as claimed in claim 1, wherein said compensation circuit portion (14) further includes base drive means formed of a series connection of a third transistor (Q906), a fourth resistor (R907), and a fifth resistor (R906), for supplying base current to bases of said first and second branch transistors (Q902, Q903) for supplying current through the parallel branches.

Claim 7

Dependent Claim 291 words

In a bandgap reference voltage generator for producing an output reference voltage V BB that is compensated for variations in supply voltage, including first and second parallel current branches connected between a first power supply potential and a second power supply potential, said first and second parallel current branches including first and second branch transistors, respectively, (Q902, Q903) for supplying current through the parallel branches, and a constant current source transistor (Q909) for establishing the output reference voltage V BB , the improvement comprising: compensation circuit portion means (14) including a supply-independent current source connected between the first power supply potential and the collector of the constant current source transistor, for supplying a constant current to the collector of the constant current source transistor as variations in the supply voltage occur, said constant current source transistor (Q909) having its base coupled to the emitter of one of the first and second branch transistors and its emitter coupled to the second power supply potential; and said supply-independent current source being formed of a first transistor (Q907), a second transistor (Q908), a first resistor (R903), a second resistor (R904), and a third resistor (R908), said first transistor (Q907) having its collector connected to the base of said second transistor (Q908) and coupled to the first power supply potential via the first resistor (R903), said first transistor (Q907) having its base connected to the emitter of said second transistor (Q908) and coupled to the collector of said constant current source transistor (Q909) via the second resistor (R904), said first transistor (Q907) having its emitter connected to the collector of said constant current source transistor (Q909), said second transistor (Q908) having its collector coupled to the first power supply potential via the third resistor (R908).

Claim 8

Dependent Claim 291 words

In a bandgap reference voltage generator for producing an output reference voltage V BB that is compensated for variations in supply voltage, including first and second parallel current branches connected between a first power supply potential and a second power supply potential, said first and second parallel current branches including first and second branch transistors, respectively, (Q902, Q903) for supplying current through the parallel branches, and a constant current source transistor (Q909) for establishing the output reference voltage V BB , the improvement comprising: compensation circuit portion means (14) including a supply-independent current source connected between the first power supply potential and the collector of the constant current source transistor, for supplying a constant current to the collector of the constant current source transistor as variations in the supply voltage occur, said constant current source transistor (Q909) having its base coupled to the emitter of one of the first and second branch transistors and its emitter coupled to the second power supply potential; and said supply-independent current source being formed of a first transistor (Q907), a second transistor (Q908), a first resistor (R903), a second resistor (R904), and a third resistor (R908), said first transistor (Q907) having its collector connected to the base of said second transistor (Q908) and coupled to the first power supply potential via the first resistor (R903), said first transistor (Q907) having its base connected to the emitter of said second transistor (Q908) and coupled to the collector of said constant current source transistor (Q909) via the second resistor (R904), said first transistor (Q907) having its emitter connected to the collector of said constant current source transistor (Q909), said second transistor (Q908) having its collector coupled to the first power supply potential via the third resistor (R908).

Claim 9

Dependent Claim 57 words

In a bandgap generator as claimed in claim 6, wherein the current from the emitter of said second transistor (Q907) is minimized with respect to the current flowing through the second resistor (R904) as variations in the supply voltage occur so that the current supplied to the collector of said constant current source transistor (Q909) remains constant.

Claim 10

Dependent Claim 39 words

In a bandgap generator as claimed in claim 7, wherein the current flowing through the second resistor (R904) is equal to V BE (Q907) /R904, where V BE (Q907) is the base-emitter voltage drop across the second transistor (Q907).

Claim 11

Dependent Claim 20 words

In a bandgap generator as claimed in claim 8, wherein said second and third transistors are of the NPN-type conductivity.

Claim 12

Dependent Claim 61 words

In a bandgap generator as claimed in claim 6, wherein said compensation circuit portion (14) further includes base drive means formed of a series connection of a third transistor (Q906), a fourth resistor (R907), and a fifth resistor (R906), for supplying base current to bases of said first and second branch transistors (Q902, Q903) for supplying current through the parallel branches.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1993-07-30	1994-01-29	1994-07-31	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1997-07-30	1998-01-29	1998-07-31	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2001-07-30	2002-01-29	2002-07-31	$7700.00	Window Closed / Lapsed

Temperature and supply compensated ECL bandgap reference voltage generator

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