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Patent US3815037A successfully refreshed from Google Patents.
US3815037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current translating circuits
Assignee: RCA Corp
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Filing: 1972-11-24
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Granted: 1974-06-04
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Expires: 1992-11-24
Abstract
Abstract An amplifier suitable for integrated circuit construction including an active device current repeater load arrangement having relatively high output impedance, good frequency response, temperature stability and signal handling capabilities. The current repeater load arrangement includes a diode connected transistor and a further transistor having proportionally related conduction characteristics. A current amplifier comprising cascaded transistors is connected between the collector of the further transistor and the bases of the further transistor and the diode connected transistor. An additional, unidirectionally conducting device, poled to conduct as the first one of the cascaded transistors ceases conduction, is coupled from the collector of the further transistor to the input of one of the cascaded transistors following the first.
Inventors
- 👤 C Wheatley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:35
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/45; H03F3/45071; H03F3/45479; G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/26; G05F3/265; H03F1/00; H03F1/30; H03F1/307; H03F3/34; H03F3/343; H03F3/347
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
237 words
In a current repeater which includes first and second transistors, each with emitter, collector and base electrodes, a direct connection between said two emitter electrodes and a common connection, a direct connection between said two base electrodes and the collector electrode of one of said transistors, a direct current coupling from one of said collector electrodes to a first circuit point adapted to receive an input current from an external source, and a direct current coupling from the other of said collector electrodes to a second circuit point, a circuit for coupling said second circuit point to a third circuit point comprising: a third and fourth transistors, each having a base and an emitter electrodes with a base-emitter semiconductor junction therebetween, and each having a collector electrode, said fourth transistor collector electrode being direct current conductively coupled to said third circuit point and said fourth transistor emitter electrode being direct current conductiveLy coupled to said second circuit point; means for direct coupling said first circuit point to said third transistor base electrode, said third transistor producing amplified emitter current in response to base current flowing therein; means for direct coupling said third transistor emitter electrode to said fourth transistor base electrode; and means coupled to the base-emitter junction of said fourth transistor for removing stored charge from said fourth transistor base-emitter junction when said third transistor base-emitter junction is rendered non-conductive by variations of said input current.
Claim 2
Dependent Claim
237 words
In a current repeater which includes first and second transistors, each with emitter, collector and base electrodes, a direct connection between said two emitter electrodes and a common connection, a direct connection between said two base electrodes and the collector electrode of one of said transistors, a direct current coupling from one of said collector electrodes to a first circuit point adapted to receive an input current from an external source, and a direct current coupling from the other of said collector electrodes to a second circuit point, a circuit for coupling said second circuit point to a third circuit point comprising: a third and fourth transistors, each having a base and an emitter electrodes with a base-emitter semiconductor junction therebetween, and each having a collector electrode, said fourth transistor collector electrode being direct current conductively coupled to said third circuit point and said fourth transistor emitter electrode being direct current conductiveLy coupled to said second circuit point; means for direct coupling said first circuit point to said third transistor base electrode, said third transistor producing amplified emitter current in response to base current flowing therein; means for direct coupling said third transistor emitter electrode to said fourth transistor base electrode; and means coupled to the base-emitter junction of said fourth transistor for removing stored charge from said fourth transistor base-emitter junction when said third transistor base-emitter junction is rendered non-conductive by variations of said input current.
Claim 3
Dependent Claim
43 words
In a current repeater as set forth in claim 1, said means for removing stored charge comprising: a device providing a controlled conductivity path between said first circuit point and said fourth transistor base electrode, controlled in response to said input current variations.
Claim 4
Dependent Claim
18 words
In a current repeater as claimed in claim 2 said device comprising a substantially unidirectional conductive semiconductor device.
Claim 5
Dependent Claim
56 words
In a current repeater as claimed in claim 2, said means for removing stored charge comprising: a fifth transistor having a base and an emitter electrodes with a base-emitter junction therebetween, having a collector electrode to which its said base electrode is direct coupled, and providing between its collector and emitter electrodes said controlled conductivity path.
Claim 6
Dependent Claim
66 words
In a current repeater as claimed in claim 1, said means for removing stored charge comprising: a fifth transistor of a complementary conductivity type to said first, second, third and fourth transistors, having a base electrode direct coupled to said first circuit point, having an emitter electrode direct coupled to said third transistor emitter electrode and having a collector electrode direct coupled to said common connection.
Claim 7
Dependent Claim
24 words
In a current repeater as claimed in claim 1, said third transistor being directly coupled at its collector electrode to said third circuit point.
Claim 8
Dependent Claim
160 words
A circuit for increasing the output impedance of a current repeater of the type which includes first and second transistors, said first and said second transistors being connected base-to-base and having their emitter electrodes each connected to a point of reference voltage, said first transistor connected at its collector to a first circuit point to which a current from an external source may be applied and said second transistor connected at its collector to said base-to-base connection and to a second circuit point comprising: third and fourth transistors, each having base, emitter and collector electrodes, the emitter of the third direct current connected to the base of the fourth, the emitter of the fourth direct current connected to said second circuit point, the base of the third direct current connected to said first circuit point, and the collectors of said third and fourth transistors connected to a third circuit point to which a circuit to be driven may be connected.
Claim 9
Dependent Claim
160 words
A circuit for increasing the output impedance of a current repeater of the type which includes first and second transistors, said first and said second transistors being connected base-to-base and having their emitter electrodes each connected to a point of reference voltage, said first transistor connected at its collector to a first circuit point to which a current from an external source may be applied and said second transistor connected at its collector to said base-to-base connection and to a second circuit point comprising: third and fourth transistors, each having base, emitter and collector electrodes, the emitter of the third direct current connected to the base of the fourth, the emitter of the fourth direct current connected to said second circuit point, the base of the third direct current connected to said first circuit point, and the collectors of said third and fourth transistors connected to a third circuit point to which a circuit to be driven may be connected.
Claim 10
Dependent Claim
48 words
A circuit as set forth in claim 7, further including means connected to the base-emitter circuit of said fourth transistor for discharging charge carriers which tend to accumulate in this circuit when said third transistor is driven to cut-off in response to current variation at said first terminal.
Claim 11
Dependent Claim
31 words
A circuit as set forth in claim 8, wherein said means for discharging comprises diode means connected between the base of said fourth transistor and said other of said circuit points.
Claim 12
Dependent Claim
27 words
A circuit as set forth in claim 9, wherein said diode means comprises a diode connected transistor of opposite conductivity type to the third and fourth transistors.
Claim 13
Dependent Claim
175 words
The combination of: first and second current repeaters, each of the type which includes first and second transistors connected base-to-base, to the collector of said second transistor, and connected emitter-to-emitter; a connection from a terminal to which current from an external source may be applied connected to the Collector of the first transistor of said first repeater; a connection from a point of operating voltage to said emitter-to-emitter connection of said first repeater; a connection from a point of reference voltage to said emitter-to-emitter connection of said second repeater; and a transistorized current amplifier means connected between the base-to-base connection of said first repeater and the collector of the first transistor of the second repeater, said amplifier means together with said first repeater exhibiting a composite gain of somewhat greater than one and which increases as Beta , the base-collector gain of the transistors of said first repeater and said amplifier means decreases, and said second repeater exhibiting a gain of somewhat less than one and which decreases as the Beta of its transistors decreases.
Claim 14
Dependent Claim
175 words
The combination of: first and second current repeaters, each of the type which includes first and second transistors connected base-to-base, to the collector of said second transistor, and connected emitter-to-emitter; a connection from a terminal to which current from an external source may be applied connected to the Collector of the first transistor of said first repeater; a connection from a point of operating voltage to said emitter-to-emitter connection of said first repeater; a connection from a point of reference voltage to said emitter-to-emitter connection of said second repeater; and a transistorized current amplifier means connected between the base-to-base connection of said first repeater and the collector of the first transistor of the second repeater, said amplifier means together with said first repeater exhibiting a composite gain of somewhat greater than one and which increases as Beta , the base-collector gain of the transistors of said first repeater and said amplifier means decreases, and said second repeater exhibiting a gain of somewhat less than one and which decreases as the Beta of its transistors decreases.
Claim 15
Dependent Claim
54 words
The combination as set forth in claim 11, wherein said current amplifier means comprises a Darlington pair connected at its base input terminal to said terminal for said external source, connected at its emitter input terminal to said base-to-base connection of said first repeater and connected at its collector-to-collector connection to said second repeater.
Claim 16
Dependent Claim
243 words
In a current repeater of the type which includes a first circuit point to which current from an external source may be applied, a second circuit point for application of a referecne voltage and a third circuit point for connection to a load, a first and a second and a third transistors of the same conductivity type each of which has a base and an emitter and a collector electrodes, means for connecting said first transistor collector electrode to said first circuit points, means for connecting each of the emitter electrodes of said first and said second transistors to said second circuit point, means for connecting each of the base electrodes of said first and said second transistors and said second transistor collector electrode to said third transistor emitter electrode, means for connecting said third transistor collector electrode to said third circuit point and means for connecting said first circuit point to said third transistor base electrode, an improvement to cause the current gain of said current repeater to increase as Beta the common-emitter forward current gains of said first and said second transistors increases, said increase being of the order of 2 parts in Beta parts, wherein said means for connecting said first circuit point to said third transistor base electrode includes: a fourth transistor having a control electrode connected to said first circuit point and having a principal conductivity path connecting said third transistor base electrode and said third circuit point.
Claim 17
Dependent Claim
243 words
In a current repeater of the type which includes a first circuit point to which current from an external source may be applied, a second circuit point for application of a referecne voltage and a third circuit point for connection to a load, a first and a second and a third transistors of the same conductivity type each of which has a base and an emitter and a collector electrodes, means for connecting said first transistor collector electrode to said first circuit points, means for connecting each of the emitter electrodes of said first and said second transistors to said second circuit point, means for connecting each of the base electrodes of said first and said second transistors and said second transistor collector electrode to said third transistor emitter electrode, means for connecting said third transistor collector electrode to said third circuit point and means for connecting said first circuit point to said third transistor base electrode, an improvement to cause the current gain of said current repeater to increase as Beta the common-emitter forward current gains of said first and said second transistors increases, said increase being of the order of 2 parts in Beta parts, wherein said means for connecting said first circuit point to said third transistor base electrode includes: a fourth transistor having a control electrode connected to said first circuit point and having a principal conductivity path connecting said third transistor base electrode and said third circuit point.
Claim 18
Dependent Claim
29 words
The improvement of claim 13 wherein said fourth transistor has a base electrode corresponding to its said control electrode and a collector-to-emitter path corresponding to its principal conductivity path.
Claim 19
Dependent Claim
35 words
The improvement of claim 14 wherein said fourth transistor is of said conductivity type and has its collector and emitter electrodes connected to said third circuit point and to said third transistor base electrode, respectively.
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |