Patent US3636384A successfully refreshed from Google Patents.
US3636384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Base-to-emitter compensation for current switch emitter-follower circuits
Assignee: International Business Machines Corp
•
Filing: 1970-09-14
•
Granted: 1972-01-18
•
Expires: 1990-09-14
Abstract
Abstract A current-switch emitter-follower is provided with a circuit which compensates for the variations in base-to-emitter voltage due to variations in temperature. The circuit comprises a regulated power supply which maintains its output at a predetermined level with respect to a reference potential such as ground. The power supply includes a transistor having its emitter at said reference potential. The base of this transistor is connected to the power supply output terminal which is therefore maintained at a predetermined level, the base-to-emitter voltage, with respect to said ground reference potential. The base-toemitter voltage of this transistor tracks the base-to-emitter voltage of the emitter-follower circuits so as to compensate for the variations in the latter.
Inventors
- 👤 David Dewitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:36
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/603; H03K17/14; H03K19/00; H03K19/02; H03K19/08; H03K19/082; H03K19/086
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
91 words
A monolithic current-switch emitter-follower circuit comprising a unitary integral semiconductor substrate, a current-switch formed in said substrate and comprising at least one transistor having a collector load impedance, a voltage supply formed in said substrate and connected to said collector load impedance, emitter-follower means formed in said substrate and connected to said current-switch, said emitter-follower means including a base-to-emitter junction having a temperature-variable potential VBE thereacross, a reference potential, and temperature-responsive means for maintaining said voltage supply at a potential with respect to said reference potential of substantially said potential VBE.
Claim 2
Dependent Claim
91 words
A monolithic current-switch emitter-follower circuit comprising a unitary integral semiconductor substrate, a current-switch formed in said substrate and comprising at least one transistor having a collector load impedance, a voltage supply formed in said substrate and connected to said collector load impedance, emitter-follower means formed in said substrate and connected to said current-switch, said emitter-follower means including a base-to-emitter junction having a temperature-variable potential VBE thereacross, a reference potential, and temperature-responsive means for maintaining said voltage supply at a potential with respect to said reference potential of substantially said potential VBE.
Claim 3
Dependent Claim
14 words
A monolithic circuit as recited in claim 1 wherein said voltage supply is regulated.
Claim 4
Dependent Claim
65 words
A monolithic circuit as recited in claim 2 wherein said voltage supply comprises a pair of transistors, a first of said transistors having an emitter and a base and the second transistor having a collector and a base, first conductive means connecting said first transistor base to the second transistor collector, and second conductive means connecting said first transistor emitter to said second transistor base.
Claim 5
Dependent Claim
39 words
A monolithic circuit as recited in claim 1 wherein said current-switch comprises a second transistor having a collector, load impedance means connecting said last-recited collector to said voltage supply, and means connecting said last-recited collector to said emitter-follower means.
Claim 6
Dependent Claim
68 words
A monolithic circuit as recited in claim 1 wherein said current-switch comprises a pair of transistors each having a collector, a pair of load resistors each connected to a respective one of said last-recited collectors and to said voltage supply, said emitter-follower means comprising a pair of transistors each connected to a respective one of said last-recited collectors and having a base-emitter junction with said potential VBE thereacross.
Claim 7
Dependent Claim
72 words
A current-switch emitter-follower circuit comprising a semiconductor substrate, a logic circuit formed in said substrate and having a collector circuit, a voltage supply formed in said substrate and connected to said collector circuit, emitter-follower means formed in said substrate and connected to cascade to said logic circuit, said emitter-follower means including a base-to-emitter junction having a potential VBE thereacross, said voltage supply being at a potential substantially equal to said potential VBE.
Claim 8
Dependent Claim
72 words
A current-switch emitter-follower circuit comprising a semiconductor substrate, a logic circuit formed in said substrate and having a collector circuit, a voltage supply formed in said substrate and connected to said collector circuit, emitter-follower means formed in said substrate and connected to cascade to said logic circuit, said emitter-follower means including a base-to-emitter junction having a potential VBE thereacross, said voltage supply being at a potential substantially equal to said potential VBE.
Claim 9
Dependent Claim
65 words
A monolithic circuit as recited in claim 6 wherein said voltage supply comprises a pair of transistors, a first of said transistors having an emitter and a base and the second transistor having a collector and a base, first conductive means connecting said first transistor base to the second transistor collector, and second conductive means connecting said first transistor emitter to said second transistor base.
Claim 10
Dependent Claim
45 words
A monolithic circuit as recited in claim 6 wherein said logic circuit comprises a current-switch having two transistors at least one having a collector, load resistor means connecting said last-recited collector to said voltage supply, and means connecting said last-recited collector to said emitter-follower means.
Claim 11
Dependent Claim
73 words
A monolithic circuit as recited in claim 6 wherein said logic circuit comprises a current-switch including a pair of transistors each having a collector, a pair of load resistors each connected to a respective one of said last-recited collectors and to said voltage supply, said emitter follower means comprising a pair of transistors each connected to a respective one of said last-recited collectors and having a base-emitter junction with said potential VBE thereacross.
Claim 12
Dependent Claim
61 words
A current-switch emitter-follower circuit comprising a current-switch having a collector load impedance, a voltage supply connected to said collector load impedance, emitter-follower means connected to said current-switch, said emitter-follower means including a base-to-emitter junction having a temperaTure varying potential VBE thereacross, and temperature-responsive means for varying the potential of said voltage supply so as to track variations in said potential VBE.
Claim 13
Dependent Claim
61 words
A current-switch emitter-follower circuit comprising a current-switch having a collector load impedance, a voltage supply connected to said collector load impedance, emitter-follower means connected to said current-switch, said emitter-follower means including a base-to-emitter junction having a temperaTure varying potential VBE thereacross, and temperature-responsive means for varying the potential of said voltage supply so as to track variations in said potential VBE.
Claim 14
Dependent Claim
65 words
A circuit as recited in claim 10 wherein said voltage supply comprises a pair of transistors, a first of of said transistors having an emitter and a base and the second transistor having a collector and a base, first conductive means connecting said first transistor base to the second transistor collector, and second conductive means connecting said first transistor emitter to said second transistor base.
Claim 15
Dependent Claim
41 words
A monolithic circuit as recited in claim 11 wherein said current-switch comprises two transistors at least one having a collector, load resistor means connecting said last-recited collector to said voltage supply, and means connecting said last-recited collector to said emitter follower.
Claim 16
Dependent Claim
69 words
A monolithic circuit as recited in claim 11 wherein said current-switch comprises a pair of transistors each having a collector, a pair of load resistors each connected to a respective one of said last-recited collectors and to said voltage supply, said emitter follower means comprising a pair of transistors each connected to a respective one of said last-recited collectors and having a base-emitter junction with said potential VBE thereacross.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |