US3906332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated circuit current supply
Assignee: TDK Micronas GmbH
•
Filing: 1973-11-01
•
Granted: 1975-09-16
•
Expires: 1993-11-01
Abstract
Abstract In a multicollector constant current source commonly used as a resistor in low power ICs (frequency divider for watches), there is provided a current supply transistor having a low base substrate capacitance and a multicollector current splitting transistor. A current supply transistor and a multicollector current distribution transistor are provided. A regulating amplifier having an output coupled to the base of the current supply transistor and having inputs coupled to at least one collector of the multicollector transistor extracts a reference voltage for keeping the current flowing in the collector constant.
Inventors
- 👤 Hans Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:08
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/561
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
197 words
A current supply circuit for a monolithic integrated circuit containing a plurality of transistor stages comprising: a source of supply voltage having first and second terminals; a current supply transistor having an emitter coupled to said source of supply voltage and having a base and a collector; a multicollector current distribution transistor having an emitter coupled to the collector of said current supply transistor and having a base; a first resistor coupled between one collector of said multicollector current distribution transistor and the zero point of the circuit; an ohmic voltage divider coupled between the collector of said current supply transistor and the zero point of the circuit; a further transistor having a base coupled to the tapping point of said ohmic voltage divider, wherein the base of said current distribution transistor is coupled to the zero point of the circuit via the collector-emitter path of said further transistor; and a regulating amplifier having an output coupled to the base of said current supply transistor and having first and second inputs, said first and second inputs coupled across said resistor for extracting a reference voltage, said regulating amplifier maintaining the current flowing in said one collector constant.
Claim 2
Dependent Claim
197 words
A current supply circuit for a monolithic integrated circuit containing a plurality of transistor stages comprising: a source of supply voltage having first and second terminals; a current supply transistor having an emitter coupled to said source of supply voltage and having a base and a collector; a multicollector current distribution transistor having an emitter coupled to the collector of said current supply transistor and having a base; a first resistor coupled between one collector of said multicollector current distribution transistor and the zero point of the circuit; an ohmic voltage divider coupled between the collector of said current supply transistor and the zero point of the circuit; a further transistor having a base coupled to the tapping point of said ohmic voltage divider, wherein the base of said current distribution transistor is coupled to the zero point of the circuit via the collector-emitter path of said further transistor; and a regulating amplifier having an output coupled to the base of said current supply transistor and having first and second inputs, said first and second inputs coupled across said resistor for extracting a reference voltage, said regulating amplifier maintaining the current flowing in said one collector constant.
Claim 3
Dependent Claim
25 words
A current supply circuit according to claim 1 wherein said further transistor is of a conductivity type opposite to that of said current distribution transistor.
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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |