Patent US4829372A successfully refreshed from Google Patents.
Patent US4725770A successfully refreshed from Google Patents.
US4725770A
Expired / Lapsed
US
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Reference voltage circuit
Assignee: Hitachi Ltd
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Filing: 1987-02-11
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Granted: 1988-02-16
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Expires: 2007-02-11
Abstract
Abstract A reference voltage circuit in which an output reference voltage is stabilized against variations in power source as well as in transistor current amplification factor h FE . In a reference voltage circuit comprising a DC power source connected to an output terminal, first and second resistors with their respective one ends commonly connected to the output terminal, a first NPN transistor with its collector shorted with its base and connected to the other end of the first resistor and its emitter grounded, a second NPN transistor with its collector connected to the other end of the second resistor and its base connected to the collector of the first NPN transistor, a third resistor connected between the emitter of the second NPN transistor and the ground, and a third NPN transistor with its collector connected to the output terminal, its base connected to the collector of the second NPN transistor and its emitter grounded, there are further provided a fourth resistor connected between the collector of the third NPN transistor and the output terminal and a PNP transistor with its base connected to the collector of the third NPN transistor, its emitter connected to the output terminal and its collector grounded.
Inventors
- 👤 Mitsuhiko Okutsu
- 👤 Tatsuo Shimura
- 👤 Tadaaki Kariya
- 👤 Kazuyoshi Masuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:13
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/30; G05F3/22
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
240 words
A reference voltage circuit comprising: (a) a DC power source; (b) a first resistor having one end connected to a high-potential side terminal of said DC power source; (c) a second resistor having one end connected to said high-potential side terminal; (d) a first NPN transistor having a base, a collector connected to said base and to the other end of said first resistor and an emitter connected to a lowpotential side terminal of said DC power source; (e) a second NPN transistor having a collector connected to the other end of said second resistor, a base connected to the collector of said first NPN transistor and an emitter; (f) a third resistor connected between the emitter of said second NPN transistor and the low-potential side terminal of said DC power source; (g) a third NPN transistor having a base connected to the collector of said second NPN transistor, an emitter connected to said low-potential side terminal and a collector; (h) a fourth resistor having one end connected to said high-potential side terminal and the other end connected to the collector of said third NPN transistor; (i) a PNP transistor having a base connected to the collector of said third NPN transistor, an emitter connected to said high-potential side terminal and a collector connected to said low-potential side terminal; and (j) an output terminal lead out from a selected one of said high-potential side terminal and said low-potential side terminal.
Claim 2
Dependent Claim
240 words
A reference voltage circuit comprising: (a) a DC power source; (b) a first resistor having one end connected to a high-potential side terminal of said DC power source; (c) a second resistor having one end connected to said high-potential side terminal; (d) a first NPN transistor having a base, a collector connected to said base and to the other end of said first resistor and an emitter connected to a lowpotential side terminal of said DC power source; (e) a second NPN transistor having a collector connected to the other end of said second resistor, a base connected to the collector of said first NPN transistor and an emitter; (f) a third resistor connected between the emitter of said second NPN transistor and the low-potential side terminal of said DC power source; (g) a third NPN transistor having a base connected to the collector of said second NPN transistor, an emitter connected to said low-potential side terminal and a collector; (h) a fourth resistor having one end connected to said high-potential side terminal and the other end connected to the collector of said third NPN transistor; (i) a PNP transistor having a base connected to the collector of said third NPN transistor, an emitter connected to said high-potential side terminal and a collector connected to said low-potential side terminal; and (j) an output terminal lead out from a selected one of said high-potential side terminal and said low-potential side terminal.
Claim 3
Dependent Claim
19 words
A reference voltage circuit according to claim 1, in which said DC power source is a constant-current power source.
Claim 4
Dependent Claim
30 words
A reference voltage circuit according to claim 2, in which said constant-current power source is constituted by a constant-voltage power source and a resistor serially connected to said power source.
Claim 5
Dependent Claim
49 words
A reference voltage circuit according to claim 1, further comprising a fifth and a sixth resistor connected in series to each other between said high-potential side terminal and said low-potential side terminal and a second output terminal lead out from a junction point between said fifth and sixth resistors.
Claim 6
Dependent Claim
44 words
A reference voltage circuit according to claim 4, further comprising a fourth NPN transistor having a base connected to the junction point between said fifth and sixth resistors, an emitter connected to said low-potential side terminal and a collector connected to a detecting circuit.
Claim 7
Dependent Claim
45 words
A reference voltage circuit according to claim 4, further comprising a second PNP transistor having a base connected to the junction point between said fifth and sixth resistors, an emitter connected to said high-potential potential side terminal and a collector connected to a detecting circuit.
Claim 8
Dependent Claim
204 words
A reference voltage circuit comprising: (a) an output terminal; (b) a DC power source connected at its high-potential side to said output temrinal and grounded at its low-potential side; (c) a first resistor having one end connected to said output terminal; (d) a second resistor having one end connected to said output terminal; (e) a first NPN transistor having a base, a collector short-circuited with said base and connected to the other end of said first resistor and an emitter grounded; (f) a second NPN transistor having a collector connected to the other end of said second resistor, a base connected to the collector of said first NPN transistor and an emitter; (g) a third resistor connected between the emitter of said second NPN transistor and the ground; (h) a third NPN transistor having a base connected to the collector of said second NPN transistor, an emitter grounded and a collector; (i) a fourth resistor having one end connected to said high-potential side terminal and the other end connected to the collector of said third NPN transistor; (j) a PNP transistor having a base connected to the collector of said third NPN transistor, an emitter connected to said output terminal and a collector grounded.
Claim 9
Dependent Claim
204 words
A reference voltage circuit comprising: (a) an output terminal; (b) a DC power source connected at its high-potential side to said output temrinal and grounded at its low-potential side; (c) a first resistor having one end connected to said output terminal; (d) a second resistor having one end connected to said output terminal; (e) a first NPN transistor having a base, a collector short-circuited with said base and connected to the other end of said first resistor and an emitter grounded; (f) a second NPN transistor having a collector connected to the other end of said second resistor, a base connected to the collector of said first NPN transistor and an emitter; (g) a third resistor connected between the emitter of said second NPN transistor and the ground; (h) a third NPN transistor having a base connected to the collector of said second NPN transistor, an emitter grounded and a collector; (i) a fourth resistor having one end connected to said high-potential side terminal and the other end connected to the collector of said third NPN transistor; (j) a PNP transistor having a base connected to the collector of said third NPN transistor, an emitter connected to said output terminal and a collector grounded.
Claim 10
Dependent Claim
19 words
A reference voltage circuit according to claim 7, in which said DC power source is a constant-current power source.
Claim 11
Dependent Claim
30 words
A reference voltage circuit according to claim 8, in which said constant-current power source is constituted by a constant-voltage power source and a resistor serially connected to said power source.
Claim 12
Dependent Claim
46 words
A reference voltage circuit according to claim 7, further comprising a fifth and a sixth resistor connected in series to each other between said output terminal and the ground and a second output terminal lead out from a junction point between said fifth and sixth resistors.
Claim 13
Dependent Claim
39 words
A reference voltage circuit according to claim 10, further comprising a fourth NPN transistor having a base connected to the junction point between said fifth and sixth resistors, an emitter grounded and a collector connected to a detecting circuit.
References Cited (Backward Citations)
US4570114A
Cited
US4675592A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-15 | 1999-08-17 | 2000-02-16 | $7700.00 | Window Closed / Lapsed |