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US3852680A
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Amplifier using a negative resistance semiconductive device operative in the anomalous mode
Assignee: RCA Corp
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Filing: 1973-03-19
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Granted: 1974-12-03
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Expires: 1993-03-19
Abstract
Abstract The bandwidth of an amplifier using a negative resistance semiconductive device operative in the anomalous mode is increased by terminating bandwidth determining diode generated signals at harmonically related frequencies in a complex impedance.
Inventors
- 👤 A Rosen
- 👤 J Reynolds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:23
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/60; H03F3/608; H03F3/04; H03F3/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
210 words
An amplifier comprising a first transmission line having a center conductor capacitively coupled to the center conductor of a second transmission line having a first electrode of a negative resistance semiconductive device connected to one end of said second transmission line center conductor and a second electrode of said device connected to ground potential, said semiconductive device generating signals at harmonically related frequencies and amplifying an input microwave signal in response to a reverse bias signal exceeding the predetermined breakdown voltage of said device, the improvement comprising: means for applying to said device a D.C. reverse bias signal having a magnitude less than said breakdown voltage; means for coupling to said device, said input microwave signal having a predetermined magnitude, said input microwave signal magnitude and said D.C. reverse bias signal magnitude in combination exceeding said reverse breakdown voltage magnitude; means for terminating said device generated signals at a first bandwidth determining harmonic frequency in a first complex impedance having real and reactive components determining amplifier operating bandwidth; means for terminating said device generated signals at a second bandwidth determining harmonic frequency in a second complex impedance having real and reactive components for determining amplifier operating bandwiTh; and means for coupling said amplified input microwave signal from said semiconductive device.
Claim 2
Dependent Claim
210 words
An amplifier comprising a first transmission line having a center conductor capacitively coupled to the center conductor of a second transmission line having a first electrode of a negative resistance semiconductive device connected to one end of said second transmission line center conductor and a second electrode of said device connected to ground potential, said semiconductive device generating signals at harmonically related frequencies and amplifying an input microwave signal in response to a reverse bias signal exceeding the predetermined breakdown voltage of said device, the improvement comprising: means for applying to said device a D.C. reverse bias signal having a magnitude less than said breakdown voltage; means for coupling to said device, said input microwave signal having a predetermined magnitude, said input microwave signal magnitude and said D.C. reverse bias signal magnitude in combination exceeding said reverse breakdown voltage magnitude; means for terminating said device generated signals at a first bandwidth determining harmonic frequency in a first complex impedance having real and reactive components determining amplifier operating bandwidth; means for terminating said device generated signals at a second bandwidth determining harmonic frequency in a second complex impedance having real and reactive components for determining amplifier operating bandwiTh; and means for coupling said amplified input microwave signal from said semiconductive device.
Claim 3
Dependent Claim
42 words
An amplifier according to claim 1, further comprising: means for directively coupling both said input microwave signal to said first transmission line center conductor and said amplified input microwave signal from said first transmission line center conductor to a terminating load impedance.
Claim 4
Dependent Claim
87 words
An amplifier according to claim 1, wherein said means for terminating said device generated signals at said first bandwidth determining harmonic frequency in a first complex impedance is a third transmission line having a center conductor with an open circuited end and a second end connected to said second center conductor one end, said third center conductor having an electrical length from said open circuited end to said second end of substantially lambda 1/4, where lambda 1 is the wavelength at said first bandwidth determining harmonic frequency.
Claim 5
Dependent Claim
106 words
An amplifier according to claim 1, wherein said means for terminating said device generated signals at said second bandwidth determining harmonic frequency in said second complex impedance is a combination of fourth and fifth transmission lines having center conductors capacitively coupled to each other over an electrical length of lambda 2/4, where lambda 2 is the wavelength at said second bandwidth determining harmonic frequency, said fourth transmission line center conductor being connected to said second center conductor at said one end and terminated in an open circuit at said other end, said fifth transmission line center conductor being terminated in an open circuit at both ends.
Claim 6
Dependent Claim
114 words
An amplifier according to claim 1, wherein said means for terminating said device generated signals at said second bandwidth determining harmonic frequency in said second complex impedance is a combination of fourth and fifth transmission lines having center conductors capacitively coupled to each other over an electrical length of lambda 2/4, where lambda 2 is the wavelength at said second bandwidth determining harmonic frequency, said fourth transmission line center conductor being connected to said second center conductor at said one end and terminated in an open circuit at said other end, said fifth transmission line center conductor being terminated in an open circuit at one end and a resistive termination at the other end.
References Cited (Backward Citations)
US3721919A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |