US3568081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential amplifier with predetermined deadband
Assignee: Honeywell Inc
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Filing: 1968-09-09
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Granted: 1971-03-02
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Expires: 1988-09-09
Abstract
Abstract A differential amplifier, having a first and a second transistor, each transistor having two series-connected resistors connected to the collector, and having two output transistors; one of the output transistors having its base connected through a temperature compensating diode to the junction of the two resistors which are connected to the collector of the first differential amplifier transistor, and having its emitter connected to the collector of the second differential amplifier transistor; and the other of the output transistors having its base connected through a temperature compensating diode to the junction of the two resistors which are connected to the collector of the second differential amplifier transistor, and having its emitter connected to the collector of the first differential amplifier transistor.
Inventors
- 👤 Balthasar H Pinckaers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:33
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/45; H03F3/45071; G; G06; G06G; G06G7/00; G06G7/12; G06G7/25; H03F3/45479
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
143 words
A differential amplifier comprising: a first and a second amplifying device, each having an input electrode, an output electrode, and a common electrode; circuit means including an impedance element connected to said common electrodes; a first and a second impedance connected in series with the output electrode of said first amplifying device; a third and a fourth impedance connected in series with the output electrode of said second amplifying device; first output circuit means conductively connnected to the junction of said first and second impedance and to the output electrode of said second amplifying device; second output circuit means conductively connected to the junction of said third and fourth impedance and to the output electrode of said first amplifying device; and a variable impedance connected from the junction of said first and second impedance to the junction of said third and fourth impedance.
Claim 2
Dependent Claim
143 words
A differential amplifier comprising: a first and a second amplifying device, each having an input electrode, an output electrode, and a common electrode; circuit means including an impedance element connected to said common electrodes; a first and a second impedance connected in series with the output electrode of said first amplifying device; a third and a fourth impedance connected in series with the output electrode of said second amplifying device; first output circuit means conductively connnected to the junction of said first and second impedance and to the output electrode of said second amplifying device; second output circuit means conductively connected to the junction of said third and fourth impedance and to the output electrode of said first amplifying device; and a variable impedance connected from the junction of said first and second impedance to the junction of said third and fourth impedance.
Claim 3
Dependent Claim
222 words
A differential amplifier comprising: a first and a second amplifying device, each having an input electrode, an output electrode, and a common electrode; circuit means including an impedance element connected to said common electrode; a first and a second impedance connected in series with the output electrode of said amplifying device; a third and a fourth impedance connected in series with the output electrode of said second amplifying device; first output circuit means conductively connected to the junction of said first and second impedance and to the output electrode of said second amplifying device wherein said first output circuit means includes a third amplifying device having an input electrode, an output electrode and a common electrode, with the input electrode connected to said junction of said first and second impedance and with the common electrode connected to the output electrode of said second amplifying device; and second output circuit means conductively connected to the junction of said third and fourth impedance and to the output electrode of said first amplifying device wherein said second output circuit means includes a fourth amplifying device having an input electrode, an output electrode and a common electrode, with the input electrode connected to said junction of said third and fourth impedance and with the common electrode connected to the output electrode of said first amplifying device.
Claim 4
Dependent Claim
222 words
A differential amplifier comprising: a first and a second amplifying device, each having an input electrode, an output electrode, and a common electrode; circuit means including an impedance element connected to said common electrode; a first and a second impedance connected in series with the output electrode of said amplifying device; a third and a fourth impedance connected in series with the output electrode of said second amplifying device; first output circuit means conductively connected to the junction of said first and second impedance and to the output electrode of said second amplifying device wherein said first output circuit means includes a third amplifying device having an input electrode, an output electrode and a common electrode, with the input electrode connected to said junction of said first and second impedance and with the common electrode connected to the output electrode of said second amplifying device; and second output circuit means conductively connected to the junction of said third and fourth impedance and to the output electrode of said first amplifying device wherein said second output circuit means includes a fourth amplifying device having an input electrode, an output electrode and a common electrode, with the input electrode connected to said junction of said third and fourth impedance and with the common electrode connected to the output electrode of said first amplifying device.
Claim 5
Dependent Claim
216 words
A differential amplifier comprising: a first and a second amplifying device, each having an input electrode, an output electrode, and a common electrode, wherein said first and second amplifying devices are transistors whose common electrodes are emitters, whose input electrodes are bases, and whose output electrodes are collectors; circuit means including an impedance element connected to said common electrodes; a first and a second impedance connected in series with the output electrode of said first amplifying device; a third and a fourth impedance connected in series with the output electrode of said second amplifying device; first output circuit means conductively connected to the junction of said first and second impedance and to the output electrode of said second amplifying device, wherein said first output circuit means includes a third transistor with a base connected to said junction of said first and second impedance and with the emitter connected to the collector of said second transistor; and second output circuit means conDuctively connected to the junction of said third and fourth impedance and to the output electrode of said first amplifying device, wherein said second output circuit means includes a fourth transistor with a base connected to said junction of said third and fourth impedance and with the emitter connected to the collector of said first transistor.
Claim 6
Dependent Claim
216 words
A differential amplifier comprising: a first and a second amplifying device, each having an input electrode, an output electrode, and a common electrode, wherein said first and second amplifying devices are transistors whose common electrodes are emitters, whose input electrodes are bases, and whose output electrodes are collectors; circuit means including an impedance element connected to said common electrodes; a first and a second impedance connected in series with the output electrode of said first amplifying device; a third and a fourth impedance connected in series with the output electrode of said second amplifying device; first output circuit means conductively connected to the junction of said first and second impedance and to the output electrode of said second amplifying device, wherein said first output circuit means includes a third transistor with a base connected to said junction of said first and second impedance and with the emitter connected to the collector of said second transistor; and second output circuit means conDuctively connected to the junction of said third and fourth impedance and to the output electrode of said first amplifying device, wherein said second output circuit means includes a fourth transistor with a base connected to said junction of said third and fourth impedance and with the emitter connected to the collector of said first transistor.
Claim 7
Dependent Claim
32 words
A differential amplifier as defined in claim 2 wherein said third and fourth amplifying devices are transistors, and wherein said first and second output circuit means each include temperature compensation diode means.
Claim 8
Dependent Claim
158 words
A differential amplifier as defined in claim 3 including a source of direct current having positive and negative terminal means; wherein the emitters of said first and second transistors are connected through said impedance element to said negative terminal means, and the collectors of said first and second transistors are respectively connected through said first and second impedance and said third and fourth impedance to said positive terminal means; wherein said first output circuit means includes a diode having an anode connected to said junction of said first and second impedance, and having a cathode connected to the base of said third transistor and through an impedance to said negative terminal means; and wherein said second output circuit means include a further diode having an anode connected to said junction of said third and fourth impedance, and having a cathode connected to the base of said fourth transistor and through a further impedance to said negative terminal means.
Claim 9
Dependent Claim
31 words
A differential amplifier as defined in claim 5 including a variable impedance connected from the junction of said first and second impedance to the junction of said third and fourth impedance.
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |