US3846705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse amplitude modulated signal generator
Assignee: Unisys Corp
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Filing: 1973-08-16
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Granted: 1974-11-05
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Expires: 1993-08-16
Abstract
Abstract A circuit that performs the oscillator, buffer and modulator functions of a pulse amplitude modulated (PAM) transmitter is described. The circuit includes three NOR gates: a first NOR gate that is feedback-coupled to function as an oscillator-generator of a binary oscillator signal; a second NOR gate that buffers the oscillator signal to provide a buffered signal that is stabilized in both amplitude and phase shift; and, a third NOR gate having a first input that is the buffered signal and a second input that is a binary pulse signal that pulse-amplitude-modulates the buffered signal.
Inventors
- 👤 W Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:32
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/02; H04L27/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
243 words
A pulse amplitude modulated signal generator, comprising: first, second and third NOR gates, each having first and second inputs and an output; inductor means coupling the output of said first NOR gate to the common coupled first and second inputs of said first NOR gate; capacitor means coupling the common coupled first and second inputs of said first NOR gate to a first voltage source; said first NOR gate coupling an oscillator signal of a frequency FO to its output; means coupling the output of said first NOR gate to the common coupled first and second inputs of said second NOR gate; first resistor means coupling the output of said first NOR gate to a second voltage source; means coupling the output of said second NOR gate to the first input of said third NOR gate; second resistor means coupling the output of said second NOR gate to a third voltage source; said second NOR gate buffering said oscillator signal and coupling a buffered signal to its output; pulse signal source means; means coupling said pulse signal source means to the second input of said third NOR gate for coupling a binary pulse signal of a frequency FM to the second input of said third NOR gate; third resistor means coupling the first input of said third NOR gate to the output of said third NOR gate; fourth resistor means coupling the output of said third NOR gate to a fourth voltage source.
Claim 2
Dependent Claim
243 words
A pulse amplitude modulated signal generator, comprising: first, second and third NOR gates, each having first and second inputs and an output; inductor means coupling the output of said first NOR gate to the common coupled first and second inputs of said first NOR gate; capacitor means coupling the common coupled first and second inputs of said first NOR gate to a first voltage source; said first NOR gate coupling an oscillator signal of a frequency FO to its output; means coupling the output of said first NOR gate to the common coupled first and second inputs of said second NOR gate; first resistor means coupling the output of said first NOR gate to a second voltage source; means coupling the output of said second NOR gate to the first input of said third NOR gate; second resistor means coupling the output of said second NOR gate to a third voltage source; said second NOR gate buffering said oscillator signal and coupling a buffered signal to its output; pulse signal source means; means coupling said pulse signal source means to the second input of said third NOR gate for coupling a binary pulse signal of a frequency FM to the second input of said third NOR gate; third resistor means coupling the first input of said third NOR gate to the output of said third NOR gate; fourth resistor means coupling the output of said third NOR gate to a fourth voltage source.
Claim 3
Dependent Claim
20 words
The signal generator of claim 1 further including load means directly coupled to the output of said third NOR gate.
Claim 4
Dependent Claim
63 words
The signal generator of claim 1 in which said means coupling said pulse signal source to the second input of said third NOR gate comprises: fifth and sixth resistor means serially coupling said pulse signal source to a fifth voltage source; means coupling the common coupled ends of said fifth and sixth resistor means to the second input of said third NOR gate.
Claim 5
Dependent Claim
34 words
The signal gEnerator of claim 1 in which said first voltage source is a source of ground potential and said second, third and fourth voltage sources are a single source of a common voltage.
References Cited (Backward Citations)
US3626417A
Cited
US3803354A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |