US4797577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bandgap reference circuit having higher-order temperature compensation
Assignee: NXP USA Inc
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Filing: 1987-12-14
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Granted: 1989-01-10
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Expires: 2007-12-14
Abstract
Abstract A bandgap reference circuit is described in which two transistors share a current with their bases coupled together and to an output terminal. A pair of resistors is coupled in series between the emitter of one of the transistors and ground, the emitter of the other transistor being coupled to a node between the resistors. A further transistor is coupled between the output terminal and the node with its base coupled to a second node between two further resistors connected in series between the output terminal and ground. The further transistor and resistors allow the circuit to be compensated for higher order temperature dependence.
Inventors
- 👤 Sam A. Hing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:13
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/30; Y; Y10; Y10S; Y10S323/00; Y10S323/907
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
130 words
A bandgap reference circuit comprising first and second transistors coupled in parallel to share a current, each having a first, second and control electrode, the control electrodes of the transistors being coupled together and to an output terminal; first and second resistors connected in series between the first electrode of the second transistor and a reference potential, the first electrode of the first transistor being coupled to a first node between the resistors; a third transistor having an emitter coupled to said first node, a second electrode coupled to the output terminal, and a control electrode; third and fourth resistors connected in series between the output terminal and the reference potential, the control electrode of the third transistor being coupled to a second node between the third and fourth resistors.
Claim 2
Dependent Claim
130 words
A bandgap reference circuit comprising first and second transistors coupled in parallel to share a current, each having a first, second and control electrode, the control electrodes of the transistors being coupled together and to an output terminal; first and second resistors connected in series between the first electrode of the second transistor and a reference potential, the first electrode of the first transistor being coupled to a first node between the resistors; a third transistor having an emitter coupled to said first node, a second electrode coupled to the output terminal, and a control electrode; third and fourth resistors connected in series between the output terminal and the reference potential, the control electrode of the third transistor being coupled to a second node between the third and fourth resistors.
Claim 3
Dependent Claim
12 words
The circuit of claim 1 wherein the first electrodes are emitter electrodes.
Claim 4
Dependent Claim
35 words
The circuit of claim 2 wherein the emitter area of the second transistor is N times that of the first and the emitter area of the third transistor is M times that of the first.
Claim 5
Dependent Claim
18 words
The circuit of claim 3 wherein negative feedback means is coupled for maintaining the output voltage substantially constant.
Claim 6
Dependent Claim
29 words
The circuit of claim 4 wherein a starting circuit is coupled for ensuring that the first and second transistors turn on when supply potential is applied to the circuit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |