US3902126A
Expired / Lapsed
US
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Single sideband generator
Assignee: TDK Micronas GmbH
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Filing: 1974-05-29
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Granted: 1975-08-26
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Expires: 1994-05-29
Abstract
Abstract There is disclosed a single sideband generator that provides as its output a selected one of two sidebands and rejects the unselected sideband and the carrier. Two triangular waveforms each having a different frequency are applied as inputs to a voltage comparator to produce a first pulse train of linearly increasing and then linearly decreasing duty cycle. Edge selection logic circuitry under control of a square wave waveform selects predetermined edges of the first pulse train relative to the negative and positive slopes of the triangular waveform having the lower frequency. The selected edges trigger a monostable multivibrator to produce a second pulse train having a repetition frequency equal to the upper sideband or lower sideband depending upon the polarity of the square wave waveform.
Inventors
- 👤 Marvin Lawrence Sassler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:33
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/10; H04L27/12; H03; H03B; H03B21/00; H03K; H03K5/00; H03K5/153; H03K5/1534; H03K7/00; H03K7/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
250 words
A single sideband generator to generate a selected one of the upper sideband and the lower sideband and to reject the carrier and the unselected sideband comprising; a first source of a first linear triangular waveform having a first given frequency, a given peak-to-peak amplitude, a positive slope and a negative slope; a second source of a second linear triangular waveform having a second given frequency greater than said first given frequency, a peak-to-peak amplitude equal to said given amplitude, a positive slope and a negative slope; first means coupled to said first and second sources to compare the amplitudes of said first and second triangular waveforms and to produce a first pulse train of linearly increasing and then linearly decreasing duty cycle, each pulse of said first pulse train having a rising edge and a falling edge; second means coupled to said first means to select one of said rising edge and said falling edge of said pulses of said first pulse train during said positive slope of said first triangular waveform and to select the other of said rising and falling edges of said pulses of said first pulse train during said negative slope of said first triangular waveform; and a monostable device coupled to said second means to provide a second pulse train having a repetition frequency equal to only one of said upper and lower sidebands depending upon said edges selected by said second means during said positive and negative slopes of said first triangular waveform.
Claim 2
Dependent Claim
250 words
A single sideband generator to generate a selected one of the upper sideband and the lower sideband and to reject the carrier and the unselected sideband comprising; a first source of a first linear triangular waveform having a first given frequency, a given peak-to-peak amplitude, a positive slope and a negative slope; a second source of a second linear triangular waveform having a second given frequency greater than said first given frequency, a peak-to-peak amplitude equal to said given amplitude, a positive slope and a negative slope; first means coupled to said first and second sources to compare the amplitudes of said first and second triangular waveforms and to produce a first pulse train of linearly increasing and then linearly decreasing duty cycle, each pulse of said first pulse train having a rising edge and a falling edge; second means coupled to said first means to select one of said rising edge and said falling edge of said pulses of said first pulse train during said positive slope of said first triangular waveform and to select the other of said rising and falling edges of said pulses of said first pulse train during said negative slope of said first triangular waveform; and a monostable device coupled to said second means to provide a second pulse train having a repetition frequency equal to only one of said upper and lower sidebands depending upon said edges selected by said second means during said positive and negative slopes of said first triangular waveform.
Claim 3
Dependent Claim
34 words
A generator according to claim 1, wherein said first means includes a voltage comparator having an output, a positive input coupled to said first source and a negative input coupled to said second source.
Claim 4
Dependent Claim
271 words
A generator according to claim 2, wherein said second means includes logic circuitry coupled to said output of said voltage comparator, a third source of a square wave waveform having a repetition frequency equal to said first given frequency and a positive polarity during said positive slope of said first triangular waveform, said third source being selectively coupled to said logic circuitry, said square wave waveform controlling said logic circuitry to select said rising edge of said pulses of said first pulse train during said positive slope of said first triangular waveform and said falling edge of said pulses of said first pulse train during said negative slope of said first triangular waveform and thereby provide said second pulse train with a repetitIon frequency equal to said upper sideband, an inverter coupled to said third source to invert said square wave waveform, said inverter being selectively coupled to said logic circuitry, said inverted square wave waveform having a positive polarity during said negative slope of said first triangular waveform, said inverted square wave waveform controlling said logic circuitry to select said falling edge of said pulses of said first pulse train during said positive slope of said first triangular and said rising edge of said pulses of said first pulse train during said negative slope of said first triangular waveform and thereby provide said second pulse train with a repetition frequency equal to said lower sideband, and a switching device coupled to said logic circuitry and selectively coupled to said third source and said inverter to couple a selected one of said third source and said inverter to said logic circuitry.
Claim 5
Dependent Claim
98 words
A generator according to claim 1, wherein said logic circuitry includes an AND gate having an output, a first input coupled to said output of said voltage comparator and a second input coupled to said switching device, an INHIBIT gate having an output, a first input coupled to said output of said voltage comparator and an inhibit input coupled to said switching device, and an OR gate having an output coupled to said monostable device, a first input coupled to said output of said AND gate and a second input coupled to said output of said INHIBIT gate.
Claim 6
Dependent Claim
14 words
A generator according to claim 4, wherein said monostable device is a monostable multivibrator.
Claim 7
Dependent Claim
268 words
A generator according to claim 1, wherein said second means includes logic circuitry coupled to said first means, a third source of a square wave waveform having a repetition frequency equal to said first given frequency and a positive polarity during said positive slope of said first triangular waveform, said third source being selectively coupled to said logic circuitry, said square wave waveform controlling said logic circuitry to select said rising edge of said pulses of said first pulse train during said positive slope of said first triangular waveform and said falling edge of said pulses of said first pulse train during said negative slope of said first triangular waveform and thereby provide said second pulse train with a repetition frequency equal to said upper sideband, an inverter coupled to said third source to invert said square wave waveform, said inverter being selectively coupled to said logic circuitry, said inverted square wave waveform having a positive polarity during said negative slope of said first triangular waveform, said inverted square wave waveform controlling said logic circuitry to select said falling edge of said pulses of said first pulse train during said positive slope of said first triangular and said rising edge of said pulses of said first pulse train during said negative slope of said first triangular waveform and thereby provide said second pulse train with a repetition frequency equal to said lower sideband, and a switching device coupled to said logic circuitry and selectively coupled to said third source and said inverter to couple a selected one of said third source and said inverter to said logic circuitry.
Claim 8
Dependent Claim
92 words
A generator according to claim 6, wherein said logic circuitry includes an AND gate having an output, a first input coupled to said first means and a second input coupled to said switching device, an INHIBIT gate having an output, a first input coupled to said first means and an inhibit input coupled to said switching device, and an OR gate having an output coupled to said monostable device, a first input coupled to said output of said AND gate and a second input coupled to said output of said INHIBIT gate.
Claim 9
Dependent Claim
14 words
A generator according to claim 7, wherein said monostable device is a monostable multivibrator.
Claim 10
Dependent Claim
103 words
A generator according to claim 1, wherein said second means inCludes third means to control the selection operation of said second means, an AND gate having an output, a first input coupled to said first means and a second input coupled to said third means, an INHIBIT gate having an output, a first input coupled to said first means and an inhibit input coupled to said third means, and an OR gate having an output coupled to said monostable device, a first input coupled to said output of said AND gate and a second input coupled to said output of said INHIBIT gate.
Claim 11
Dependent Claim
14 words
A generator according to claim 9, wherein said monostable device is a monostable multivibrator.
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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |