US3914683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current stabilizing arrangement with resistive-type current amplifier and a differential amplifier
Assignee: US Philips Corp
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Filing: 1974-03-18
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Granted: 1975-10-21
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Expires: 1994-03-18
Abstract
Abstract The invention relates to a current stabilising arrangement which comprises a first and a second parallel circuit connected between a first and a second common terminal, in which circuits two currents whose magnitudes have a mutually fixed ratio are sustained. The first circuit includes the main current path of a first transistor of a first conductivity type and the second circuit including the main current path of a second transistor of said first conductivity type and a first impedance. One end of the first impedance is connected to said second transistor and the other end is connected to the second common terminal. The control electrodes of the first and the second transistor are interconnected.
Inventors
- 👤 De Plassche Rudy Johan Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:54
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/26; G05F3/265; G05F1/00; G05F1/10; G05F1/46; G05F1/462; G05F1/463
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
214 words
A current stabilizing arrangement comprising first and second circuits connected in parallel between first and second common terminals, in which circuits two currents whose magnitudes have a mutually fixed ratio are sustained, the first circuit including the main current path of a first transistor of a first conductivity type, the second circuit including the main current path of a second transistor of said first conductivity type and a first impedance having one end connected to said second transistor and its other end connected to the second common terminal, means interconnecting the control electrodes of the first and second transistor, the first and second parallel circuits further including a second and a third impedance respectively, means connecting the first and seCond transistors via said scond and third impedances, respectively, to the first common terminal, a differential amplifier having a first and a second input, means connecting the first input of the differential amplifier to the end of the second impedance which is remote from the first common terminal and the second input to the end of the third impedance which is remote from the first common terminal, and means for applying to the control electrodes of the first and second transistors a control signal which is determined by the output signal of the differential amplifier.
Claim 2
Dependent Claim
214 words
A current stabilizing arrangement comprising first and second circuits connected in parallel between first and second common terminals, in which circuits two currents whose magnitudes have a mutually fixed ratio are sustained, the first circuit including the main current path of a first transistor of a first conductivity type, the second circuit including the main current path of a second transistor of said first conductivity type and a first impedance having one end connected to said second transistor and its other end connected to the second common terminal, means interconnecting the control electrodes of the first and second transistor, the first and second parallel circuits further including a second and a third impedance respectively, means connecting the first and seCond transistors via said scond and third impedances, respectively, to the first common terminal, a differential amplifier having a first and a second input, means connecting the first input of the differential amplifier to the end of the second impedance which is remote from the first common terminal and the second input to the end of the third impedance which is remote from the first common terminal, and means for applying to the control electrodes of the first and second transistors a control signal which is determined by the output signal of the differential amplifier.
Claim 3
Dependent Claim
59 words
A current stabilizing arrangement as claimed in claim 1, wherein the second and third impedances comprise the branches of a current amplifier which are connected between a first and a second terminal respectively and a sum terminal, the sum terminal being connected to the first common terminal thereby maintaining currents of a mutually fixed ratio in the two branches.
Claim 4
Dependent Claim
17 words
A current stabilizing arrangement as claimed in claim 1, wherein the second and third impedances comprise resistors.
Claim 5
Dependent Claim
29 words
A current stabilizing arrangement as claimed in claim 1 wherein the output signal of the differential amplifier is fed to the control electrodes of the first and second transistors.
Claim 6
Dependent Claim
67 words
A current stabilizing arrangement as claimed in claim 1 characterized in that the output signal of the differential amplifier is fed to the first common terminal and that the control electrodes of the first and the second transistor are connected to a terminal of the differential amplifier at which a voltage appears which is related to the common-mode signal at the two inputs of the differential amplifier.
Claim 7
Dependent Claim
43 words
A current stabilizing arrangement as claimed in claim 5, characterized in that the output of the differential amplifier is connected to the control electrode of a third transistor of the first conductivity type and having an emitter connected to the first common terminal.
Claim 8
Dependent Claim
39 words
A current stabilizing arrangement as claimed in claim 5 wherein the control electrodes of the first and the second transistor are connected to the common emitters of a transistor pair which constitutes a differential stage of the differential amplifier.
Claim 9
Dependent Claim
35 words
A current stabilizing arrangement as claimed in claim 7, wherein the control electrodes of the first and the second transistor are connected to the second common terminal via a diode connected in the forward direction.
Claim 10
Dependent Claim
54 words
A current stabilizing arrangement as claimed in claim 1 wherein the first circuit includes a first compensation resistance connected between the first transistor and the second common terminal and a second compensation resistance connected between the control electrode of said first transistor and the junction of said first transistor and the first compensation resistance.
Claim 11
Dependent Claim
36 words
A current stabilizing arrangement as claimed in claim 9, characterized in that the values of the first and second compensation resistances are chosen so that the current supplied by the current stabilizing arrangement is temperature independent.
Claim 12
Dependent Claim
28 words
A current stabilizing arrangement as claimed in claim 1 further comprising a compensation resistance connected between the control electrode of the first transistor and the second common terminal.
Claim 13
Dependent Claim
27 words
A current stabilizing arrangement as claimed in claim 11, wherein the compensation resistance has such a value that the current consumed by the complete arrangement is temperature-independent.
Claim 14
Dependent Claim
33 words
A current stabilizing arrangement as claimed in claim 1 wherein said control signal applying means comprises a transistor connected as an emitter follower and having a main current path bypassed by a resistor.
Claim 15
Dependent Claim
25 words
A current stabilizing arrangement as claimed in claim 6, characterized in that the main current path of the third transistor is bypassed by a resistance.
Claim 16
Dependent Claim
178 words
A current stabilizing circuit comprising, first and second common terminals, first and second circuits connected in parallel between said first and second terminals, saiD first circuit comprising a first impedance element and a first transistor connected in series between said first and second common terminals, said second circuit comprising a second impedance element, a second transistor and a third impedance element connected in series between said first and second common terminals, means directly connecting the control electrodes of said first and second transistors together, a differential amplifier having first and second input terminals and an output terminal, means connecting the first and second input terminals of said differential amplifier to said first and second impedance elements, respectively, and means coupled to the differential amplifier output terminal for coupling a control signal that is determined by the output signal of the differential amplifier to the control electrodes of said first and second transistors whereby the currents flowing in said first and second parallel circuits are maintained in a mutually fixed ratio determined by said first and second impedance elements.
Claim 17
Dependent Claim
178 words
A current stabilizing circuit comprising, first and second common terminals, first and second circuits connected in parallel between said first and second terminals, saiD first circuit comprising a first impedance element and a first transistor connected in series between said first and second common terminals, said second circuit comprising a second impedance element, a second transistor and a third impedance element connected in series between said first and second common terminals, means directly connecting the control electrodes of said first and second transistors together, a differential amplifier having first and second input terminals and an output terminal, means connecting the first and second input terminals of said differential amplifier to said first and second impedance elements, respectively, and means coupled to the differential amplifier output terminal for coupling a control signal that is determined by the output signal of the differential amplifier to the control electrodes of said first and second transistors whereby the currents flowing in said first and second parallel circuits are maintained in a mutually fixed ratio determined by said first and second impedance elements.
Claim 18
Dependent Claim
58 words
A current stabilizing circuit as claimed in claim 15 wherein said differential amplifier comprises third and fourth transistors each having an output electrode, said stabilizing circuit further comprising a current amplifier having first and second terminals coupled to respective output electrodes of the third and fourth transistors and a third terminal coupled to one of said common terminals.
Claim 19
Dependent Claim
66 words
A current stabilizing circuit as claimed in claim 15 wherein said differential amplifier comprises third and fourth transistors each having an output electrode and a common mode terminal, said coupling means including means for supplying the differential amplifier output signal to one of said first and second common terminals and means coupling said common mode terminal to the control electrodes of said first and second transistors.
Claim 20
Dependent Claim
31 words
A current stabilizing circuit as claimed in claim 15 wherein said first and second impedance elements comprise equal resistors whereby equal currents are maintained in said first and second parallel circuits.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |