US4413237A
Expired / Lapsed
US
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Sawtooth wave oscillator
Assignee: Sony Corp
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Filing: 1981-03-10
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Granted: 1983-11-01
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Expires: 2001-03-10
Abstract
Abstract A sawtooth wave oscillator is disclosed which includes a series connection consisting of a charging circuit and a first capacitor, a voltage dependent capacitor connected in parallel to the first capacitor, and a discharging circuit connected in parallel to the first capacitor, whereby a sawtooth wave which has good linearity can be generated with a simple circuit construction.
Inventors
- 👤 Yasuharu Baba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:11
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/50; H03K4/90
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
122 words
A sawtooth wave oscillator comprising: (a) a series circuit of a first capacitor means and a charging means for producing a first current; (b) a discharging means connected in parallel with said first capacitor means; and (c) a second capacitor means having a capacitance which decreases in accordance with increase of the reverse bias across said second capacitor means and connected in parallel with said first capacitor means and their terminals connected together wherein decrease of said current due to increase of voltage at the junction point of said charging means and said first capacitor means corresponds to the decrease of capacitance of said second capacitor means, so that the non-linearity sawtooth wave caused by decrease of said first current is improved.
Claim 2
Dependent Claim
122 words
A sawtooth wave oscillator comprising: (a) a series circuit of a first capacitor means and a charging means for producing a first current; (b) a discharging means connected in parallel with said first capacitor means; and (c) a second capacitor means having a capacitance which decreases in accordance with increase of the reverse bias across said second capacitor means and connected in parallel with said first capacitor means and their terminals connected together wherein decrease of said current due to increase of voltage at the junction point of said charging means and said first capacitor means corresponds to the decrease of capacitance of said second capacitor means, so that the non-linearity sawtooth wave caused by decrease of said first current is improved.
Claim 3
Dependent Claim
25 words
A sawtooth wave oscillator according to claim 1, wherein said first capacitor means and said second capacitor means are fabricated in the same semiconductor device.
Claim 4
Dependent Claim
20 words
A sawtooth wave oscillator according to claim 1, wherein said charging means and discharging means are composed of transistors, respectively.
Claim 5
Dependent Claim
31 words
A sawtooth wave oscillator according to claim 3, wherein said first capacitor means, said second capacitor means, said charging means and said discharging means are fabricated in the same semiconductor device.
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) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |