US4035744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sawtooth wave oscillator circuit
Assignee: NEC Corp
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Filing: 1976-08-24
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Granted: 1977-07-12
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Expires: 1996-08-24
Abstract
Abstract A sawtooth oscillator comprises a differential amplifier and first and second switching transistors driven into opposite conductivity states by the output of the differential amplifier. A charging capacitor is connected between the switching transistors and has one end connected in positive feedback fashion to one input of the differential amplifier.
Inventors
- 👤 Firokazu Fukaya
- 👤 Katsuhiro Takagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:23
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/023; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/50; H03K4/501
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
126 words
An oscillator circuit comprising a differential amplifier having first and second input terminals and an output terminal; means for applying a reference potential to the second input terminal of said amplifier; first and second switching means driven concurrently into an on or off state by the output of said amplifier; charge storing means having one end connected to said first switching means, the other end of said charge storing means being connected to said second switching means and to said first input terminal of said differential amplifier in a positive feedback fashion; means for discharging a charge stored in said charge storing means; and a power source connected across the series circuit of said first switching means, said charge storing means and said second switching means.
Claim 2
Dependent Claim
126 words
An oscillator circuit comprising a differential amplifier having first and second input terminals and an output terminal; means for applying a reference potential to the second input terminal of said amplifier; first and second switching means driven concurrently into an on or off state by the output of said amplifier; charge storing means having one end connected to said first switching means, the other end of said charge storing means being connected to said second switching means and to said first input terminal of said differential amplifier in a positive feedback fashion; means for discharging a charge stored in said charge storing means; and a power source connected across the series circuit of said first switching means, said charge storing means and said second switching means.
Claim 3
Dependent Claim
60 words
An oscillator circuit claimed in claim 1, wherein said discharging means comprises a first and a second conductive means, said first conductive means being connected across the series circuit of said charge storing means and said second switching means, and said second conductive means being connected across the series circuit of said charge storing means and said first switching means.
Claim 4
Dependent Claim
23 words
An oscillator circuit claimed in claim 2, wherein said discharging means further comprises a biasing means series coupled with said first conductive means.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |