US4599521A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bias circuit with voltage and temperature compensation for an emitter coupled logic circuit
Assignee: Fujitsu Ltd
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Filing: 1982-12-27
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Granted: 1986-07-08
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Expires: 2002-12-27
Abstract
Abstract A bias circuit for providing a reference voltage to an output circuit, for example, an ECL circuit in an LSI. The bias circuit is able to operate at a lower power supply voltage of about -2 V and includes a first transistor having an emitter which is connected to a power supply and a base and a collector commonly connected through an impedance circuit to ground. The bias circuit is also connected to the output circuit, whereby heat generation in the LSI is decreased.
Inventors
- 👤 Yasunori Kanai
- 👤 Eiji Sugiyama
- 👤 Kazumasa Nawata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:58
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/02; H03K19/08; H03K19/082; H03K19/086; G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/22; G05F3/222; G05F3/227
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
235 words
A bias circuit, operatively connected to a power supply, for providing a bias voltage to an output means, comprising: a first transistor of a first conductivity type having an emitter, a base, and a collector operatively connected to the base; a first reference-voltage terminal, operatively connected to the emitter of said first transistor, for providing a first reference-voltage; a substantially constant-voltage node; an output node, operatively connected to the base and collector of said first transistor and to the output means, for providing the bias voltage; first impedance means, operatively connected between said substantially constant-voltage node and said output node, for providing a first impedance, the bias voltage being applied to the output means; second impedance means, operatively connected between said first reference-voltage terminal and said substantially constant-voltage node; a second transistor having a base, having a collector connected to the base and having an emitter operatively connected to said first reference-voltage terminal; a PN junction element including a third transistor of a second conductivity type opposite to the first conductivity type, said third transistor having an emitter operatively connected to said substantially constant-voltage node, having a base operatively connected to the base and collector of said second transistor, and having a collector, the voltage at said substantially constant-voltage node being determined by said PN junction element and said second transistor; and a second reference-voltage terminal operatively connected to the collector of said third transistor.
Claim 2
Dependent Claim
235 words
A bias circuit, operatively connected to a power supply, for providing a bias voltage to an output means, comprising: a first transistor of a first conductivity type having an emitter, a base, and a collector operatively connected to the base; a first reference-voltage terminal, operatively connected to the emitter of said first transistor, for providing a first reference-voltage; a substantially constant-voltage node; an output node, operatively connected to the base and collector of said first transistor and to the output means, for providing the bias voltage; first impedance means, operatively connected between said substantially constant-voltage node and said output node, for providing a first impedance, the bias voltage being applied to the output means; second impedance means, operatively connected between said first reference-voltage terminal and said substantially constant-voltage node; a second transistor having a base, having a collector connected to the base and having an emitter operatively connected to said first reference-voltage terminal; a PN junction element including a third transistor of a second conductivity type opposite to the first conductivity type, said third transistor having an emitter operatively connected to said substantially constant-voltage node, having a base operatively connected to the base and collector of said second transistor, and having a collector, the voltage at said substantially constant-voltage node being determined by said PN junction element and said second transistor; and a second reference-voltage terminal operatively connected to the collector of said third transistor.
Claim 3
Dependent Claim
23 words
A bias circuit as set forth in claim 1, wherein said second reference-voltage terminal provides a second reference-voltage equal to the first voltage.
Claim 4
Dependent Claim
25 words
A bias circuit as set forth in claim 1, wherein said second reference-voltage terminal provides a second reference-voltage which is lower than the first reference-voltage.
Claim 5
Dependent Claim
226 words
A bias circuit, operatively connected to a power supply, for providing a bias voltage to an output means, comprising: a first transistor of a first conductivity type, having an emitter, having a base, and having a collector operatively connected to the base; a first reference-voltage terminal, operatively connected to the emitter of said first transistor, for providing a first reference-voltage; a second reference-voltage terminal for providing a second reference-voltage; a substantially constant-voltage node; an output node, operatively connected to the base and collector of said first transistor and to the output means, for providing the bias voltage; first impedance means, operatively connected between said substantially constant-voltage node and said output node, for providing a first impedance means, the bias voltage being applied to the output means; second impedance means operatively connected between said first reference-voltage terminal and said substantially constant-voltage node; a second transistor of a second conductivity type opposite to the first conductivity type, having an emitter operatively connected to said substantially constant-voltage node, having a base, and having a collector operatively connected to said second reference-voltage terminal; and a third transistor having a base and a collector commonly connected to said base of said second transistor, and having an emitter operatively connected to said first reference-voltage terminal, the voltage at said substantially constant-voltage node being determined by said second transistor and said third transistor.
Claim 6
Dependent Claim
226 words
A bias circuit, operatively connected to a power supply, for providing a bias voltage to an output means, comprising: a first transistor of a first conductivity type, having an emitter, having a base, and having a collector operatively connected to the base; a first reference-voltage terminal, operatively connected to the emitter of said first transistor, for providing a first reference-voltage; a second reference-voltage terminal for providing a second reference-voltage; a substantially constant-voltage node; an output node, operatively connected to the base and collector of said first transistor and to the output means, for providing the bias voltage; first impedance means, operatively connected between said substantially constant-voltage node and said output node, for providing a first impedance means, the bias voltage being applied to the output means; second impedance means operatively connected between said first reference-voltage terminal and said substantially constant-voltage node; a second transistor of a second conductivity type opposite to the first conductivity type, having an emitter operatively connected to said substantially constant-voltage node, having a base, and having a collector operatively connected to said second reference-voltage terminal; and a third transistor having a base and a collector commonly connected to said base of said second transistor, and having an emitter operatively connected to said first reference-voltage terminal, the voltage at said substantially constant-voltage node being determined by said second transistor and said third transistor.
Claim 7
Dependent Claim
25 words
A bias circuit as set forth in claim 4, wherein said second reference-voltage terminal provides a second reference-voltage which is lower than the first reference-voltage.
Claim 8
Dependent Claim
71 words
A bias circuit as set forth in claim 1, wherein said first transistor is of a first conductivity type, and wherein said PN junction element comprises a third transistor of a second conductivity type opposite to the first conductivity type, said third transistor having an emitter operatively connected to said substantially constant-voltage node, having a base operatively connected to the base and collector of said second transistor, and having a collector.
Claim 9
Dependent Claim
30 words
A bias circuit as set forth in claim 6, further comprising a second reference-voltage terminal, wherein the collector of said third transistor is operatively connected to said second reference-voltage terminal.
Claim 10
Dependent Claim
34 words
A bias circuit as set forth in claim 6, further comprising a second reference-voltage terminal, operatively connected to the collector of said third transistor, for providing a second reference-voltage lower than the first reference-voltage.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |