US3605035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage-controlled exponential oscillator
Assignee: Canadian Patents and Development Ltd
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Filing: 1970-03-27
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Granted: 1971-09-14
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Expires: 1990-03-27
Abstract
Abstract An accurate exponential characteristic is obtained by employing as a diode a silicon carbide lamp having a low temperature coefficient, and by restricting the frequency of the oscillator itself to one octave, the necessary wide range of output frequencies being obtained in a frequency divider. The oscillator is automatically biased to reset it repeatedly to the bottom of its restricted frequency range, as the input continues to rise, such resetting being coordinated with selection of the appropriate frequency range of the frequency divider in order that the output should continue to advance in frequency with the input voltage.
Inventors
- 👤 David O Rocheleau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:27
CPC Classifications
G; G10; G10H; G10H5/00; G10H5/02; G10H5/06; H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/50; H03K4/83; H03K4/84; H03K6/00; H04; H04R; H04R25/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
214 words
An oscillator circuit comprising a. a diode having an exponential voltage-current characteristic and a low-temperature coefficient over a first voltage range, input means connected to the diode for receiving a linearly varying input voltage extending over a second voltage range greater than said first voltage range, c. detecting means connected to the input means for detecting a voltage therein exceeding said first range, d. biasing means controlled by the detecting means and connected between the input means and the diode to bias the voltage received by the diode to maintain such voltage within said first range, e. oscillating means connected to the diode for generating an output having a frequency varying exponentially with the voltage received by the diode, such output extending over a first frequency range corresponding to said first voltage range, f. frequency divider means connected to receive said output for dividing the same to generate oscillations extending over a second frequency range greater than said first frequency range and corresponding to said second voltage range, g. output means connected to the frequency divider means for receiving oscillations therefrom within a selected portion of said second frequency range, and h. means connecting the detecting means to the output means to select said portion in accordance with the bias applied to the diode.
Claim 2
Dependent Claim
214 words
An oscillator circuit comprising a. a diode having an exponential voltage-current characteristic and a low-temperature coefficient over a first voltage range, input means connected to the diode for receiving a linearly varying input voltage extending over a second voltage range greater than said first voltage range, c. detecting means connected to the input means for detecting a voltage therein exceeding said first range, d. biasing means controlled by the detecting means and connected between the input means and the diode to bias the voltage received by the diode to maintain such voltage within said first range, e. oscillating means connected to the diode for generating an output having a frequency varying exponentially with the voltage received by the diode, such output extending over a first frequency range corresponding to said first voltage range, f. frequency divider means connected to receive said output for dividing the same to generate oscillations extending over a second frequency range greater than said first frequency range and corresponding to said second voltage range, g. output means connected to the frequency divider means for receiving oscillations therefrom within a selected portion of said second frequency range, and h. means connecting the detecting means to the output means to select said portion in accordance with the bias applied to the diode.
Claim 3
Dependent Claim
15 words
An oscillator circuit according to claim 1, wherein said diode is a silicon carbide lamp.
Claim 4
Dependent Claim
26 words
An oscillator circuit according to claim 2, wherein said first frequency range is a single octave and said second frequency range is at least 2 octaves.
Claim 5
Dependent Claim
159 words
An oscillator circuit according to claim 3, i. wherein said frequency divider means (f) comprises a plurality of flip-flop stages, an input of a first of which is connected to said output of the oscillating means, an input of each successive stage being connected to an output of the preceding stage, whereby each successive stage normally oscillates at a half the frequency of the preceding stage, j. and wherein said output means (g) comprises i. an OR gate connected to receive an output from each stage, ii. an INHIBIT gate connected between the OR gate and the output of each stage except the last, iii. a multivibrator connected to receive the output of the OR gate, iv. a reset connection extending from the multivibrator to each stage to check oscillation thereof, k. said means (h) connecting the detecting means to the INHIBIT gates for enabling at least one such gate to select the highest frequency received by the multivibrator.
References Cited (Backward Citations)
US3288904A
Cited
US3490327A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |