US3569735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant amplitude sawtooth generator
Assignee: United States Department of the Army
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Filing: 1968-09-24
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Granted: 1971-03-09
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Expires: 1988-09-24
Abstract
Abstract This invention relates to a constant amplitude sawtooth generator. The circuit of the generator comprises a charging capacitor that is discharged through a transistor when an input pulse is applied to the base of the transistor. The sawtooth is linearized by the use of a bootstrap circuit comprising two transistors. A fourth transistor in conjunction with a zener diode is used to sample and control the peak output of the generator. If the output of the generator exceeds the breakdown voltage of the zener diode, the fourth transistor will conduct and lower the charging voltage of the charging capacitor.
Inventors
- 👤 Wendell E Lavender
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:25
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/50; H03K4/58
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
A constant amplitude sawtooth generator comprising: a charging-discharging circuit producing a substantially sawtooth waveform; a linear amplifying means including a pair of grounded emitter transistors, each having a base, emitter, and collector, connected to said charging-discharging circuit, and a potentiometer connected from the emitter of one of said pair of transistors to the collector of the other of said pair of transistors for varying the gain of said amplifying means; and sampling means connected to said amplifying means and said charging-discharging circuit for maintaining said waveform at a constant output amplitude.
Claim 2
Dependent Claim
91 words
A constant amplitude sawtooth generator comprising: a charging-discharging circuit producing a substantially sawtooth waveform; a linear amplifying means including a pair of grounded emitter transistors, each having a base, emitter, and collector, connected to said charging-discharging circuit, and a potentiometer connected from the emitter of one of said pair of transistors to the collector of the other of said pair of transistors for varying the gain of said amplifying means; and sampling means connected to said amplifying means and said charging-discharging circuit for maintaining said waveform at a constant output amplitude.
Claim 3
Dependent Claim
41 words
A constant amplitude sawtooth generator according to claim 1 wherein said sampling means comprises: a grounded emitter transistor switch; and a Zener diode connected to said amplifying means and said transistor switch for decreasing the potential source to said charging-discharging circuit.
Claim 4
Dependent Claim
68 words
A constant amplitude sawtooth generator according to claim 1 wherein said charging-discharging circuit comprises: a capacitor; a source of positive potential to charge said capacitor; a first transistor having a base, emitter, and collector; and a pulse source, connected to the base of said first Transistor and to said capacitor through the collector of said first transistor, for discharging said capacitor upon the application of said pulse source.
Claim 5
Dependent Claim
180 words
A constant amplitude sawtooth generator comprising: a charging-discharging circuit having a capacitor; a source of positive potential to charge said capacitor; a first transistor having a base, emitter, and collector; a pulse source, connected to the base of said first transistor and to said capacitor through the collector of said first transistor, for discharging said capacitor upon the application of said pulse source; said charging-discharging circuit thereby producing a substantially sawtooth waveform; amplifying means comprising a second and third transistor, each having a base, emitter, and collector, connected to said capacitor; a potentiometer connected from the emitter of said second transistor to the collector of said third transistor for varying the gain of said amplifying means; said amplifying means linearly amplifying said waveform from said charging-discharging circuit; and sampling means comprising a fourth transistor having a grounded emitter, and a Zener diode, said Zener diode being connected to the collector of said third transistor and the base of said fourth transistor for decreasing the potential source of said charging-discharging circuit and thereby maintaining said waveform at a constant output amplitude.
Claim 6
Dependent Claim
180 words
A constant amplitude sawtooth generator comprising: a charging-discharging circuit having a capacitor; a source of positive potential to charge said capacitor; a first transistor having a base, emitter, and collector; a pulse source, connected to the base of said first transistor and to said capacitor through the collector of said first transistor, for discharging said capacitor upon the application of said pulse source; said charging-discharging circuit thereby producing a substantially sawtooth waveform; amplifying means comprising a second and third transistor, each having a base, emitter, and collector, connected to said capacitor; a potentiometer connected from the emitter of said second transistor to the collector of said third transistor for varying the gain of said amplifying means; said amplifying means linearly amplifying said waveform from said charging-discharging circuit; and sampling means comprising a fourth transistor having a grounded emitter, and a Zener diode, said Zener diode being connected to the collector of said third transistor and the base of said fourth transistor for decreasing the potential source of said charging-discharging circuit and thereby maintaining said waveform at a constant output amplitude.
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |