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US4315219A
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Amplitude controlled digital oscillator
Assignee: National Research Council Canada
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Filing: 1980-04-07
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Granted: 1982-02-09
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Expires: 2000-04-07
Abstract
Abstract The digital oscillator includes a memory which stores 12 bit words representing sampling points of the analog waveform to be produced and a D/A multiplying converter which receives the bit words and converts them to an analog values, the amplitudes of which are controlled by a reference voltage. The analog output is monitored and compared to a stable reference source in order to generate the controlling reference voltage thus maintaining a constant amplitude digital oscillator output.
Inventors
- 👤 David Rocheleau
- 👤 Karl Ayukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:02
CPC Classifications
H; H03; H03L; H03L5/00; G; G06; G06F; G06F1/00; G06F1/02; G06F1/03; G06F1/035; G06F1/0353
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
90 words
A digital oscillator comprising: digital to analog multiplying converter means for multiplying a parallel binary number by a reference signal to produce an analog output; memory means for storing a desired waveform in binary numbers, said memory means coupled to the converter means; control means for driving the memory means to sequentially transfer binary numbers to the converter means at a desired rate; and detector means coupled to the converter means output for monitoring the amplitude of the analog output and for controlling the reference signal to the converter means.
Claim 2
Dependent Claim
90 words
A digital oscillator comprising: digital to analog multiplying converter means for multiplying a parallel binary number by a reference signal to produce an analog output; memory means for storing a desired waveform in binary numbers, said memory means coupled to the converter means; control means for driving the memory means to sequentially transfer binary numbers to the converter means at a desired rate; and detector means coupled to the converter means output for monitoring the amplitude of the analog output and for controlling the reference signal to the converter means.
Claim 3
Dependent Claim
58 words
An oscillator as claimed in claim 1 wherein the detector means includes: sample and hold circuit means for sampling the analog output under the control of the control means; stable reference source means; and means connected to the sample and hold circuit means and the stable reference source means for providing the reference signal to the converter means.
Claim 4
Dependent Claim
28 words
An oscillator as claimed in claim 2 wherein the sample and hold circuit means is a peak value detector for sampling the analog output once during each cycle.
Claim 5
Dependent Claim
45 words
An oscillator as claimed in claim 2 wherein the digital to analog converter means output is a current and the oscillator includes a current to voltage converter means coupled to the digital to analog converter means for converting the output current to an output voltage.
Claim 6
Dependent Claim
19 words
An oscillator as claimed in claims 2, 3 or 4 wherein the reference source means is a voltage source.
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) | 1985-02-08 | 1985-08-10 | 1986-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-08 | 1989-08-10 | 1990-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-08 | 1993-08-10 | 1994-02-09 | $7700.00 | Window Closed / Lapsed |