Patent US3582827A successfully refreshed from Google Patents.
US3582827A
Expired / Lapsed
US
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Oscillator with phase-shifting tuning capacitance in parallel with frequency sensitive feedback network
Assignee: Individual
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Filing: 1968-10-21
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Granted: 1971-06-01
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Expires: 1988-10-21
Abstract
Abstract A low frequency oscillator having a frequency sensitive feedback network between its output and input is tuned by one or two separate feedback paths containing variable capacitance means operative to vary the phase shift of currents flowing in said feedback network.
Inventors
- 👤 Bjourn E Bjerede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:35
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R27/26; G01R27/2605
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
125 words
A low frequency oscillator comprising amplifier means, a frequency-sensitive feedback network connected between output and input of said amplifier means, tuning means for said oscillator comprising variable capacitance means connected between said output and said input of said amplifier and forming at least one feedback path separated from said feedback network, said capacitance means being operative to vary the phase shift of current in said frequency-sensitive feedback network thereby to change the output frequency of said oscillator, the improvement wherein said output of said amplifier means comprises a pair of balanced outputs producing output voltages having equal amplitudes but opposite phases, said variable capacitance means comprising a pair of capacitors forming differential capacitance means, said capacitors each being connected to one of said balanced outputs.
Claim 2
Dependent Claim
125 words
A low frequency oscillator comprising amplifier means, a frequency-sensitive feedback network connected between output and input of said amplifier means, tuning means for said oscillator comprising variable capacitance means connected between said output and said input of said amplifier and forming at least one feedback path separated from said feedback network, said capacitance means being operative to vary the phase shift of current in said frequency-sensitive feedback network thereby to change the output frequency of said oscillator, the improvement wherein said output of said amplifier means comprises a pair of balanced outputs producing output voltages having equal amplitudes but opposite phases, said variable capacitance means comprising a pair of capacitors forming differential capacitance means, said capacitors each being connected to one of said balanced outputs.
Claim 3
Dependent Claim
26 words
The oscillator of claim 1, wherein a voltage divider is connected between the output of said amplifier means and the input of said frequency-sensitive feedback network.
References Cited (Backward Citations)
US3046491A
Cited
US3206697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |