US3686581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric signal amplifying apparatus
Assignee: Advantest Corp
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Filing: 1970-03-31
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Granted: 1972-08-22
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Expires: 1990-03-31
Abstract
Abstract This invention is a signal amplifying apparatus which detects a magnetic flux generated in a magnetic core by an input signal and obtains such output as cancels it.
Inventors
- 👤 Ikuo Takeda
- 👤 Takashi Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:12
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/38; H03F3/387
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
211 words
Amplifying apparatus for amplifying an electrical input signal e1 comprising a non-saturating magnetic core, a signal winding having a first number of turns n1 and a resistance r1, the winding being wound on the core and connected to conduct current from said input signal and induce an input flux in the core, a feedback winding having a second number of turns n2 and a resistance r2, the winding being wound on the core in operative relationship with the first winding, amplifier means coupled through a resistance ro to the feedback winding to pass current therethrough and induce a feedback flux in the core opposed to said input flux, means including flux detecting winding means on the core for detecting magnetic fluxes in said core induced by said signal and feedback windings and operative to deliver a control signal to said amplifier means to continuously maintain the resultant of said fluxes in the core at zero, and apparatus output terminals connected to the output of the amplifier means to deliver an output signal eo proportional to the feedback current, the relative numbers of turns in the input and feedback windings being different and the apparatus output signal being related to its input signal such that eo (n1/n2) (ro + r2/r1) e1 .
Claim 2
Dependent Claim
211 words
Amplifying apparatus for amplifying an electrical input signal e1 comprising a non-saturating magnetic core, a signal winding having a first number of turns n1 and a resistance r1, the winding being wound on the core and connected to conduct current from said input signal and induce an input flux in the core, a feedback winding having a second number of turns n2 and a resistance r2, the winding being wound on the core in operative relationship with the first winding, amplifier means coupled through a resistance ro to the feedback winding to pass current therethrough and induce a feedback flux in the core opposed to said input flux, means including flux detecting winding means on the core for detecting magnetic fluxes in said core induced by said signal and feedback windings and operative to deliver a control signal to said amplifier means to continuously maintain the resultant of said fluxes in the core at zero, and apparatus output terminals connected to the output of the amplifier means to deliver an output signal eo proportional to the feedback current, the relative numbers of turns in the input and feedback windings being different and the apparatus output signal being related to its input signal such that eo (n1/n2) (ro + r2/r1) e1 .
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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |