US4513250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal cuber
Assignee: Nortel Networks Ltd
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Filing: 1983-05-31
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Granted: 1985-04-23
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Expires: 2003-05-31
Abstract
Abstract A signal cuber for producing the third harmonic of an input signal, for use in a signal distortion correction circuit, comprises a split-ring mixer having two ports, at which there is produced a signal at the second harmonic of the input signal, unequally terminated, whereby the second harmonic signal is reflected into the mixer to be mixed with the input signal to produce the third harmonic. The mixer can consist of transformers and diodes, which can be Schottky diodes which are forward biassed by a potential difference supplied to the ports via the unequal terminations, which may be constituted by a single resistor.
Inventors
- 👤 Stephen G. Harman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:45
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/32; H03F1/3241
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
87 words
A signal cuber comprising a split-ring mixer having an input, an output, and two ports at which in response to an input signal applied to the input of the mixer there is produced a signal having a frequency component at the second harmonic of the input signal, and means for unequally terminating said ports to reflect at least part of said frequency component back into the mixer, thereby to produce a frequency component at the third harmonic of the input signal at the output of the mixer.
Claim 2
Dependent Claim
87 words
A signal cuber comprising a split-ring mixer having an input, an output, and two ports at which in response to an input signal applied to the input of the mixer there is produced a signal having a frequency component at the second harmonic of the input signal, and means for unequally terminating said ports to reflect at least part of said frequency component back into the mixer, thereby to produce a frequency component at the third harmonic of the input signal at the output of the mixer.
Claim 3
Dependent Claim
144 words
A signal cuber as claimed in claim 1 wherein the split-ring mixer comprises an input transformer having a first winding coupled to the input and a second winding having a center tap coupled to a point of reference potential; an output transformer having a first winding having a center tap which constitutes one of the two ports, a second winding having a center tap which constitutes the other of the two ports, and a third winding coupled to the output; and two pairs of diodes, the diodes of each pair being connected in series with the same polarity between a respective terminal of the first winding of the output transformer and a respective terminal of the second winding of the output transformer, with the junction between each pair of diodes being connected to a respective terminal of the second winding of the input transformer.
Claim 4
Dependent Claim
73 words
A signal cuber as claimed in claim 2 wherein the center tap of the second winding of the input transformer is capacitively coupled to the point of reference potential, and the means for unequally terminating said ports comprises resistive means coupling said ports to points having a potential difference therebetween, the potential difference forward biassing said pairs of diodes via the resistive means and the first and second windings of the output transformer.
Claim 5
Dependent Claim
14 words
A signal cuber as claimed in claim 3 wherein the diodes are Schottky diodes.
Claim 6
Dependent Claim
25 words
A signal cuber as claimed in claim 1 and including an amplifier stage having a high input impedance coupled to the output of the mixer.
Claim 7
Dependent Claim
18 words
A signal cuber as claimed in claim 5 wherein the amplifier stage comprises a common collector transistor stage.
Claim 8
Dependent Claim
25 words
A signal cuber as claimed in claim 1 and including an amplifier stage having a low output impedance coupled to the input of the mixer.
Claim 9
Dependent Claim
18 words
A signal cuber as claimed in claim 7 wherein the amplifier stage comprises a common collector transistor stage.
References Cited (Backward Citations)
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US3348155A
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US3825843A
Cited
US3911369A
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US4157508A
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US4122399A
Cited
US4465980A
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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) | 1988-04-22 | 1988-10-22 | 1989-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-22 | 1992-10-22 | 1993-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-22 | 1996-10-22 | 1997-04-23 | $7700.00 | Window Closed / Lapsed |