Patent US3760200A successfully refreshed from Google Patents.
US3760200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor integrated circuit
Assignee: Hitachi Ltd
•
Filing: 1972-02-24
•
Granted: 1973-09-18
•
Expires: 1992-02-24
Abstract
Abstract A semiconductor integrated circuit is formed on a semiconductor substrate and includes a current mode type logic circuit and a constant current circuit to supply a constant current to the logic circuit. A reference resistor for adjusting the constant current is provided separately from the semiconductor substrate and connected to the constant current circuit. With this construction, fluctuations of the amplitude of the logic circuit output signal may be reduced.
Inventors
- 👤 A Masaki
- 👤 T Kaji
- 👤 K Taniguchi
- 👤 A Hayasaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:44
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
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
221 words
A semiconductor integrated circuit device comprising: a semiconductor substrate on which an integrated circuit is formed, said integrated circuit including at least one current mode type logic circuit and a constant current circuit connected to saiD logic circuit for supplying a constant current thereto; and reference means disposed at the outside of said semiconductor substrate and connected to said constant current circuit for determining said constant current, said logic circuit comprising at least one reference transistor having a base electrode to which a reference signal is applied, and at least one input transistor having a base electrode to which an input signal is applied, the emitter electrodes of said input and reference transistors being connected to said constant current circuit and the collector electrodes of said transistors being adapted to produce at least one logic signal in response to said input signal, said constant current circuit including a grounded collector type first transistor having a base electrode connected to said reference means, a second transistor having its collector electrode connected to the base electrode of said first transistor, and a third transistor having its collector electrode connected to said logic circuit, the base electrodes of said second and third transistors and the emitter electrodes of said second and third transistors being connected to a terminal for receiving a power source voltage.
Claim 2
Dependent Claim
221 words
A semiconductor integrated circuit device comprising: a semiconductor substrate on which an integrated circuit is formed, said integrated circuit including at least one current mode type logic circuit and a constant current circuit connected to saiD logic circuit for supplying a constant current thereto; and reference means disposed at the outside of said semiconductor substrate and connected to said constant current circuit for determining said constant current, said logic circuit comprising at least one reference transistor having a base electrode to which a reference signal is applied, and at least one input transistor having a base electrode to which an input signal is applied, the emitter electrodes of said input and reference transistors being connected to said constant current circuit and the collector electrodes of said transistors being adapted to produce at least one logic signal in response to said input signal, said constant current circuit including a grounded collector type first transistor having a base electrode connected to said reference means, a second transistor having its collector electrode connected to the base electrode of said first transistor, and a third transistor having its collector electrode connected to said logic circuit, the base electrodes of said second and third transistors and the emitter electrodes of said second and third transistors being connected to a terminal for receiving a power source voltage.
Claim 3
Dependent Claim
36 words
A semiconductor integrated circuit device according to claim 1, which further comprises a series circuit composed of a resistor and a diode connected between the collector electrode of said second transistor and said power source terminal.
Claim 4
Dependent Claim
29 words
A semiconductor integrated circuit device according to claim 1, which further comprises a differential amplifier circuit connected between said reference means and the base electrode of said first transistor.
Claim 5
Dependent Claim
49 words
A semiconductor integrated circuit device according to claim 1, which further comprises emitter resistors for connecting the emitter electrodes of said second and third transistors to said power source terminal and a common-base resistor for connecting the bases of said second and third transistors to said power source terminal.
Claim 6
Dependent Claim
36 words
A semiconductor integrated circuit device according to claim 4, which further comprises a series circuit composed of a resistor and a diode connected between the collector electrode of said second transistor and said power source terminal.
Claim 7
Dependent Claim
49 words
A semiconductor integrated circuit device according to claim 3, which further comprises emitter resistors for connecting the emitter electrodes of said second and third transistors to said power source terminal and a common-base resistor for connecting the base of said second and third transistors to said power source terminal.
Claim 8
Dependent Claim
36 words
A semiconductor integrated circuit device according to claim 1, which further comprises a pair of Schottky barrier diodes connected between the respective collectors of the transistors of said logic circuit and a source of reference potential.
References Cited (Backward Citations)
US3617778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |