US3863158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic phasor generator
Assignee: RTX Corp
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Filing: 1973-06-04
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Granted: 1975-01-28
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Expires: 1993-06-04
Abstract
Abstract A stepped approximation of a sine wave is generated by operational amplifiers, having feedback resistors of a given magnitude, which are connected through successive input resistors to a signal representing the magnitude of the desired synthetic sinusoid by means of an electronic multiplexing switch which is advanced by clocking signals spaced one sixteenth of the period of the desired synthetic sinusoid so as to cause 16 steps spanning discrete angular fractions of the period of said sinusoid, the input resistors having magnitudes related to the given magnitudes of said feedback resistors by the sine of the accumulated angle of said angular fractions, in relation to the successive clock signals.
Inventors
- 👤 Bertram F Kupersmith
- 👤 Jr Clarence Casper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:27
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/02; H03K4/026
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
188 words
A synthetic phasor generator comprising: clock means providing a sequence of cyclic timing signals each having a period which is a small fraction of the period of a sinusoid to be synthesized; operational amplifier means having feedback resistance of a given magnitude; electronic switching means having a plurality of inputs, said switching means connected to said clock means and operable in response to said timing signals to connect said operational amplifier means to successive, selected ones of said inputs, one at a time, in successive ones of the fractions of the period of the sinusoid to be synthesized; signal receiving means for receiving a signal relating to the desired magnitude of the sinusoid to be generated; and a plurality of input resistances, each connected between the related one of said switching means inputs and said signal receiving means, each having a magnitude of said feed-back resistance of said operational amplifier related to The given magnitude by the sine of the angle corresponding to the fraction of the period of said sinusoid within which the related one of said switching means inputs is connected to said operational amplifier means.
Claim 2
Dependent Claim
188 words
A synthetic phasor generator comprising: clock means providing a sequence of cyclic timing signals each having a period which is a small fraction of the period of a sinusoid to be synthesized; operational amplifier means having feedback resistance of a given magnitude; electronic switching means having a plurality of inputs, said switching means connected to said clock means and operable in response to said timing signals to connect said operational amplifier means to successive, selected ones of said inputs, one at a time, in successive ones of the fractions of the period of the sinusoid to be synthesized; signal receiving means for receiving a signal relating to the desired magnitude of the sinusoid to be generated; and a plurality of input resistances, each connected between the related one of said switching means inputs and said signal receiving means, each having a magnitude of said feed-back resistance of said operational amplifier related to The given magnitude by the sine of the angle corresponding to the fraction of the period of said sinusoid within which the related one of said switching means inputs is connected to said operational amplifier means.
Claim 3
Dependent Claim
59 words
A synthetic phasor generator according to claim 1 wherein said electronic switch means comprises a binary selected multiplex switch and a binary counter, said counter connected to said clock means for advancement by said timing signals, said counter having a maximum count equal to the number of said timing signals in one period of the sinusoid to be synthesized.
Claim 4
Dependent Claim
130 words
A synthetic phasor generator according to claim 1 wherein said operational amplifier means comprises two operational amplifiers, each having a feedback resistor having a resistance of said given magnitude, and said electronic switching means comprises two sets of inputs and is operable to connect a first one of said sets to a first one of said operational amplifiers during one half of the period of the sinusoid and is operable to connect the second set to the second one of said operational amplifiers during the second half of the period of the sinusoid, said operational amplifier means providing the output of said first operational amplifier without inversion and inverting the output of said second operational amplifier, thereby to provide the two halves of the synthesized sinusoid with mutually opposite sense.
Claim 5
Dependent Claim
34 words
A synthetic phasor generator according to claim 3 wherein the output of said second operational amplifier is connected through a resistance of said given magnitude to an inverting input of said first operational amplifier.
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) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |