Patent US3766412A successfully refreshed from Google Patents.
US3766412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for controlling the pulse width of a monotonically increasing wave form
Assignee: YASHICA CO Ltd NIPPON ELECTRIC
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Filing: 1972-09-11
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Granted: 1973-10-16
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Expires: 1992-09-11
Abstract
Abstract A differential amplifier having a pair of common emitter transistors for adjustably controlling the pulse width of a monotanically increasing wave form is provided with a resistor interposed between the control terminal and the base of the control transistor, and a constant current circuit connected between this base and the D.C. source for the control transistor, whereby a constant current supplied by the constant current circuit is caused to flow through the resistor.
Inventors
- 👤 M Takahashi
- 👤 T Hashimoto
- 👤 A Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:23
CPC Classifications
H; H03; H03K; H03K6/00; H03K5/00; H03K5/003
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
152 words
A circuit responsive to an input pulse of a monotonically increasing wave form and an adjustable stationary voltage for producing an output pulSe of a width determined by said stationary voltage including an input terminal and a control terminal supplied with said input pulse and said stationary voltage, respectively, a first transistor having its base connected to said input terminal, a second transistor having its base operatively coupled to said control terminal, and a D.C. source for said transistors, said first and said second transistors forming a differential amplifier, the collector current of said first transistor providing said output pulse, wherein the improvement comprises a resistor interposed between said control terminal and said base of said second transistor and a constant current circuit connected between said D.C. source and said base of said second transistor, whereby the constant current supplied by said constant current circuit is caused to flow through said resistor.
Claim 2
Dependent Claim
152 words
A circuit responsive to an input pulse of a monotonically increasing wave form and an adjustable stationary voltage for producing an output pulSe of a width determined by said stationary voltage including an input terminal and a control terminal supplied with said input pulse and said stationary voltage, respectively, a first transistor having its base connected to said input terminal, a second transistor having its base operatively coupled to said control terminal, and a D.C. source for said transistors, said first and said second transistors forming a differential amplifier, the collector current of said first transistor providing said output pulse, wherein the improvement comprises a resistor interposed between said control terminal and said base of said second transistor and a constant current circuit connected between said D.C. source and said base of said second transistor, whereby the constant current supplied by said constant current circuit is caused to flow through said resistor.
Claim 3
Dependent Claim
121 words
A circuit as claimed in claim 1, said differential amplifier including a constant current source having a third transistor whose collector current is supplied to said first and said second transistors as a constant current, wherein said constant current circuit comprises a fourth transistor and an emitter resistor therefor for supplying its collector current as said constant current of said constant current circuit, the resistance of said emitter resistor and the ratio of the collector currents of said third and said fourth transistors being selected to provide the last-mentioned constant current that develops across said resistor interposed between said control terminal and said base of said second transistor a voltage which is equal to the offset voltage of said differential amplifier.
Claim 4
Dependent Claim
75 words
A circuit as claimed in claim 2, wherein said differential amplifier further comprises a fifth transistor having its base directly connected to the base of said third transistor and having its collector connected to the base of said fourth transistor, said third and said fifth transistors having substantially the same characteristics, said fifth transistor thereby supplying the base current of said fourth transistor which is substantially equal to the collector current of said third transistor.
Claim 5
Dependent Claim
124 words
In combination in an analog comparator, a first transistor having its base connected as an input terminal for receiving a variable input potential, a control terminal adapted for connection to a reference potential, a second transistor having its base operatively coupled to said control terminal, and a D.C. source for said transistors, said first and said second transistors forming a differential amplifier, the collector of said first transistor providing a comparator output, wherein the improvement comprises a resistor interposed between said control terminal and said base of said second transistor and a constant current circuit connected between said D.C. source and said base of said second transistor, whereby the constant current supplied by said constant current circuit is caused to flow through said resistor.
Claim 6
Dependent Claim
124 words
In combination in an analog comparator, a first transistor having its base connected as an input terminal for receiving a variable input potential, a control terminal adapted for connection to a reference potential, a second transistor having its base operatively coupled to said control terminal, and a D.C. source for said transistors, said first and said second transistors forming a differential amplifier, the collector of said first transistor providing a comparator output, wherein the improvement comprises a resistor interposed between said control terminal and said base of said second transistor and a constant current circuit connected between said D.C. source and said base of said second transistor, whereby the constant current supplied by said constant current circuit is caused to flow through said resistor.
Claim 7
Dependent Claim
119 words
A combination claimed in claim 4, said differential amplifier including a constant current source having a third transistor whose collector current is supplied to said first and said second transistors as a constant current, wherein said constant current circuit comprises a fourth transistor and an emitter resistor therefor for supplying its collector current as said constant current of said constant current circuit, the resistance of said emitter resistor and the ratio of the collector currents of said third and said fourth transistors being selected to provide said constant current that develops across said resistor interposed between said control terminal and said base of said second transistor a voltage which is equal to the offset voltage of said differential amplifier.
Claim 8
Dependent Claim
75 words
A combination as claimed in claim 5, wherein said differential amplifier further comprises a fifth transistor having its base directly connected to the base of said third transistor and having its collector connected to the base of said fOurth transistor, said third and said fifth transistors having substantially the same characteristics, said fifth transistor thereby supplying the base current of said fourth transistor which is substantially equal to the collector current of said third transistor.
References Cited (Backward Citations)
US3277319A
Cited
US3532909A
Cited
US3684971A
Cited
US3688209A
Cited
US3551832A
Cited
US3648061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |