Patent US3579116A successfully refreshed from Google Patents.
US3579116A
Expired / Lapsed
US
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Frequency mixer
Assignee: Schlumberger Overseas Messgeratebau und Vertrieb GmbH
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Filing: 1968-12-10
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Granted: 1971-05-18
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Expires: 1988-12-10
Abstract
Abstract A frequency mixer for mixing two time-varying input signals of substantially different dominant frequencies has the signal of higher frequency applied to an impedance having two ends connected in a circuit with two assymetrically-conductive, nonlinear elements. These elements serve to mix the higher frequency signal with the signal of lower frequency, the two elements being poled in the same current-conducting direction and the latter signal being applied to a junction intermediate the two elements. The higher frequency signal is applied to the two ends of the impedance by a balun comprising two parallel conductors wound upon a high-frequency transformer element; one end of the conductor receiving the signal of higher frequency and the other end being connected to ground potential which traces through to a corresponding end of the impedance. A circuit tuned to a desired sum or difference frequency has s signal output end connected to a point on the impedance between the two ends thereof.
Inventors
- 👤 Herbert Knirsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:11
CPC Classifications
H; H03; H03D; H03D9/00; H03D9/06; H03D9/0608
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
150 words
A circuit for mixing two time varying electrical signals of different relative frequencies, one of the signal frequencies being considerably higher than the other, the circuit comprising: means including an impedance having a center tap connection thereto; balun means having an input circuit for receiving the higher frequency signal unbalanced with respect to a reference potential and providing an output coupling of said higher frequency signal across said impedance and balanced with respect to said reference potential; nonlinear circuit means for generating a signal band of mixed frequencies in response to said two electrical signals of different relative frequencies, said nonlinear circuit means having an input circuit receiving the lower frequency signal and being coupled across said impedance for receiving said higher frequency signal; and tuned circuit means coupled to the center tap of said impedance for providing an output signal of a predetermined frequency within said mixed frequency band.
Claim 2
Dependent Claim
150 words
A circuit for mixing two time varying electrical signals of different relative frequencies, one of the signal frequencies being considerably higher than the other, the circuit comprising: means including an impedance having a center tap connection thereto; balun means having an input circuit for receiving the higher frequency signal unbalanced with respect to a reference potential and providing an output coupling of said higher frequency signal across said impedance and balanced with respect to said reference potential; nonlinear circuit means for generating a signal band of mixed frequencies in response to said two electrical signals of different relative frequencies, said nonlinear circuit means having an input circuit receiving the lower frequency signal and being coupled across said impedance for receiving said higher frequency signal; and tuned circuit means coupled to the center tap of said impedance for providing an output signal of a predetermined frequency within said mixed frequency band.
Claim 3
Dependent Claim
47 words
The circuit as defined in claim 1 wherein aid nonlinear circuit means comprises: two series connected assymetrically-conductive devices having nonlinear voltage-current characteristics and being poled in the same current-conducting direction, the lower frequency signal being applied to said nonlinear circuit means at the junction of said devices.
Claim 4
Dependent Claim
79 words
The circuit as defined in claim 1 wherein said balun means comprises: a high frequency ferrite core and a bifilar winding on said core, said bifilar winding including two electrical conductors, each of said conductors having an input and an output end, the output ends of said conductors being connected across said impedance and the input ends of said conductors being respectively connected to a reference potential and to a source of the one signal of higher relative frequency.
Claim 5
Dependent Claim
33 words
The circuit as defined in claim 3 wherein said impedance comprises a resistance element and wherein said tuned circuit means is coupled to said resistance element at a point intermediate the ends thereof.
Claim 6
Dependent Claim
49 words
The circuit as defined in claim 4 wherein said nonlinear circuit means comprises two series connected assymetrically conductive devices having nonlinear voltage-current characteristics and being poled in the same current conduction direction, the lower frEquency signal being applied to said nonlinear circuit means at the junction of said devices.
References Cited (Backward Citations)
US2654836A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |