US3825775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for converting square waves into asymmetrical rectangular waves
Assignee: Jasper Electronics Manufacturing Corp
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Filing: 1973-05-15
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Granted: 1974-07-23
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Expires: 1993-05-15
Abstract
Abstract The specification discloses a generator for producing rectangular waves in which the duty cycle of the waves is adjusted to eliminate unwanted harmonics therefrom. Means can be provided for varying the duty cycle in a desired manner.
Inventors
- 👤 A Welsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:44
CPC Classifications
H; H03; H03K; H03K7/00; H03K7/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
228 words
In combination; generator means having at least one output forming a source of square waves and a circuit connected to the output for converting the square waves into asymmetrical rectangular waves, said circuit comprising; an output transistor having base, collector and emitter terminals, a source of biasing voltage and a first resistor connected in series with said collector and emitter terminals, a first point spaced from the voltage source end of said first resistor forming an output terminal for the rectangular waves, an input transistor also having base, collector and emitter terminals, said source of biasing voltage and a second resistor connected in series with the collector and emitter terminals of said input transistor, a second point spaced from the voltage source end of said second resistor being connected to the base terminal of said output transistor, a third resistor connecting said generator means output to the base terminal of said input transistor, a diode in parallel with said third resistor, a capacitor connected between the base and emitter terminals of said input transistor, a source of control voltage, and a fourth resistor connected to said source of control voltage and operatively connected to at least one of the base and emitter terminals of said input transistor whereby variations in said control voltage will cause variations in the voltage supplied to the base terminal of said output transistor.
Claim 2
Dependent Claim
228 words
In combination; generator means having at least one output forming a source of square waves and a circuit connected to the output for converting the square waves into asymmetrical rectangular waves, said circuit comprising; an output transistor having base, collector and emitter terminals, a source of biasing voltage and a first resistor connected in series with said collector and emitter terminals, a first point spaced from the voltage source end of said first resistor forming an output terminal for the rectangular waves, an input transistor also having base, collector and emitter terminals, said source of biasing voltage and a second resistor connected in series with the collector and emitter terminals of said input transistor, a second point spaced from the voltage source end of said second resistor being connected to the base terminal of said output transistor, a third resistor connecting said generator means output to the base terminal of said input transistor, a diode in parallel with said third resistor, a capacitor connected between the base and emitter terminals of said input transistor, a source of control voltage, and a fourth resistor connected to said source of control voltage and operatively connected to at least one of the base and emitter terminals of said input transistor whereby variations in said control voltage will cause variations in the voltage supplied to the base terminal of said output transistor.
Claim 3
Dependent Claim
13 words
A combination according to claim 1 in which said control voltage is variable.
Claim 4
Dependent Claim
13 words
A combination according to claim 1 in which said control voltage varies cyclically.
Claim 5
Dependent Claim
20 words
A combination according to claim 1 in wHich said fourth resistor is in the base-emitter circuit of said input transistor.
Claim 6
Dependent Claim
147 words
A combination according to claim 1 in which said output transistor is an NPN transistor having the collector terminal forming the output terminal means and connected to ground via said first resistor and having the emitter terminal connected to the negative side of said source of biasing voltage, said second resistor connecting said base terminal to the negative side of said source, said input transistor being a PNP transistor having the emitter terminal connected to ground via said fourth resistor and to said negative side of said source via a further resistor and the collector terminal being connected to the base terminal of said output transistor, said capacitor being connected between the base terminal of said input transistor and ground, and said diode in parallel with said third resistor being poled toward the base terminal of said input transistor, said square waves being negative going square waves.
Claim 7
Dependent Claim
47 words
The combination according to claim 1 in which said generator means comprises a square wave generator and a series of frequency dividers connected in cascade, and a said circuit for converting square waves into asymmetrical rectangular waves connected to the output side of each said frequency divider.
Claim 8
Dependent Claim
22 words
The combination according to claim 6 in which said source of control voltage is common to at least some of said circuits.
Claim 9
Dependent Claim
21 words
The combination according to claim 6 which includes a respective source of control voltage for at least some of said circuits.
Claim 10
Dependent Claim
25 words
The combination according to claim 6 in which each said output transistor is an NPN transistor and each said input transistor is a PNP transistor.
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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |