Patent US5736901A successfully refreshed from Google Patents.
US5736901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio frequency amplifier with stable operation and restrained oscillation at low frequencies
Assignee: Panasonic Holdings Corp
•
Filing: 1996-04-03
•
Granted: 1998-04-07
•
Expires: 2016-04-03
Abstract
Abstract In a radio frequency amplifier, a resistor and an inductor are connected to a gate terminal of transistor such as an FET. Another resistor for preventing oscillation is connected to the inductor. A capacitor and a third resistor connected to each other in parallel are connected to the first resistor while the other ends thereof are grounded. A resistance value of the resistor for preventing oscillation is in the range of about 30 OMEGA to about 70 OMEGA . An inductance value of the inductor is such that an impedance value for a low frequency becomes negligibly small.
Inventors
- 👤 Morio Nakamura
- 👤 Masahiro Maeda
- 👤 Yorito Ota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:56
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/189; H03F3/19; H03F3/193; H03F3/1935; H03F1/00; H03F1/08; H03F1/083; H03F1/086
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
56 words
A radio frequency amplifier comprising: a transistor; an inductor connected to an input terminal of the transistor; a first resistor connected to the inductor; a capacitor having one end connected to the first resistor and an other end grounded; and a second resistor connected between a power supply terminal and the input terminal of the transistor.
Claim 2
Dependent Claim
56 words
A radio frequency amplifier comprising: a transistor; an inductor connected to an input terminal of the transistor; a first resistor connected to the inductor; a capacitor having one end connected to the first resistor and an other end grounded; and a second resistor connected between a power supply terminal and the input terminal of the transistor.
Claim 3
Dependent Claim
58 words
A radio frequency amplifier comprising: a transistor; a microstrip line connected to an input terminal of the transistor; a first resistor connected to the microstrip line; a capacitor having one end connected to the first resistor and an other end grounded; and a second resistor connected between a power supply terminal and the input terminal of the transistor.
Claim 4
Dependent Claim
58 words
A radio frequency amplifier comprising: a transistor; a microstrip line connected to an input terminal of the transistor; a first resistor connected to the microstrip line; a capacitor having one end connected to the first resistor and an other end grounded; and a second resistor connected between a power supply terminal and the input terminal of the transistor.
Claim 5
Dependent Claim
67 words
A radio frequency amplifier comprising: a transistor; an inductor connected to an input terminal of the transistor; a first resistor connected to the inductor; a second resistor connected between a power supply terminal and the input terminal of the transistor; and a capacitor and a third resistor connected to each other in parallel, each having one end connected to the first resistor and an other end grounded.
Claim 6
Dependent Claim
67 words
A radio frequency amplifier comprising: a transistor; an inductor connected to an input terminal of the transistor; a first resistor connected to the inductor; a second resistor connected between a power supply terminal and the input terminal of the transistor; and a capacitor and a third resistor connected to each other in parallel, each having one end connected to the first resistor and an other end grounded.
Claim 7
Dependent Claim
69 words
A radio frequency amplifier comprising: a transistor; a microstrip line connected to an input terminal of the transistor; a first resistor connected to the microstrip line; a second resistor connected between a power supply terminal and the input terminal of the transistor; and a capacitor and a third resistor connected to each other in parallel, each having one end connected to the first resistor and an other end grounded.
Claim 8
Dependent Claim
69 words
A radio frequency amplifier comprising: a transistor; a microstrip line connected to an input terminal of the transistor; a first resistor connected to the microstrip line; a second resistor connected between a power supply terminal and the input terminal of the transistor; and a capacitor and a third resistor connected to each other in parallel, each having one end connected to the first resistor and an other end grounded.
Claim 9
Dependent Claim
28 words
A radio frequency amplifier according to claim 1, wherein a resistance value of the first resistor is in a range of about 30 Ω to about 70 Ω.
Claim 10
Dependent Claim
28 words
A radio frequency amplifier according to claim 2, wherein a resistance value of the first resistor is in a range of about 30 Ω to about 70 Ω.
Claim 11
Dependent Claim
28 words
A radio frequency amplifier according to claim 3, wherein a resistance value of the first resistor is in a range of about 30 Ω to about 70 Ω.
Claim 12
Dependent Claim
28 words
A radio frequency amplifier according to claim 4, wherein a resistance value of the first resistor is in a range of about 30 Ω to about 70 Ω.
Claim 13
Dependent Claim
28 words
A radio frequency amplifier according to claim 1, wherein an inductance value of the inductor is such that an impedance value for a low frequency becomes negligibly small.
Claim 14
Dependent Claim
28 words
A radio frequency amplifier according to claim 3, wherein an inductance value of the inductor is such that an impedance value for a low frequency becomes negligibly small.
Claim 15
Dependent Claim
28 words
A radio frequency amplifier according to claim 2, wherein a length of the microstrip line is such that an impedance value for a low frequency becomes negligibly small.
Claim 16
Dependent Claim
28 words
A radio frequency amplifier according to claim 4, wherein a length of the microstrip line is such that an impedance value for a low frequency becomes negligibly small.
Claim 17
Dependent Claim
35 words
A radio frequency amplifier according to claim 1, wherein an inductance value L of the inductor is set so as to satisfy a relation: about 10 Ω≦2 πfL≦about 100 Ω for an operating frequency f.
Claim 18
Dependent Claim
35 words
A radio frequency amplifier according to claim 3, wherein an inductance value L of the inductor is set so as to satisfy a relation: about 10 Ω≦2 πfL≦about 100 Ω for an operating frequency f.
Claim 19
Dependent Claim
56 words
A radio frequency amplifier according to claim 2, wherein a characteristic impedance of the microstrip line is set so as to be higher than a resistance value of the first resistor, and a length d of the microstrip line is set so as to satisfy a relation: λ/40≦d≦λ/8 for a wavelength λ of an operating frequency.
Claim 20
Dependent Claim
56 words
A radio frequency amplifier according to claim 4, wherein a characteristic impedance of the microstrip line is set so as to be higher than a resistance value of the first resistor, and a length d of the microstrip line is set so as to satisfy a relation: λ/40≦d≦λ/8 for a wavelength λ of an operating frequency.
Claim 21
Dependent Claim
50 words
A radio frequency amplifier according to claim 1, wherein the radio frequency amplifier is used in a microwave frequency band in a range of about 1 GHz to about 2 GHz, and an output power of the transistor is in a range of several hundreds of mW to several W.
Claim 22
Dependent Claim
50 words
A radio frequency amplifier according to claim 2, wherein the radio frequency amplifier is used in a microwave frequency band in a range of about 1 GHz to about 2 GHz, and an output power of the transistor is in a range of several hundreds of mW to several W.
Claim 23
Dependent Claim
50 words
A radio frequency amplifier according to claim 3, wherein the radio frequency amplifier is used in a microwave frequency band in a range of about 1 GHz to about 2 GHz, and an output power of the transistor is in a range of several hundreds of mW to several W.
Claim 24
Dependent Claim
50 words
A radio frequency amplifier according to claim 4, wherein the radio frequency amplifier is used in a microwave frequency band in a range of about 1 GHz to about 2 GHz, and an output power of the transistor is in a range of several hundreds of mW to several W.
Claim 25
Dependent Claim
29 words
A radio frequency amplifier according to claim 1, further comprising a third resistor having one end connected to the input terminal of the transistor and an other end grounded.
Claim 26
Dependent Claim
29 words
A radio frequency amplifier according to claim 2, further comprising a third resistor having one end connected to the input terminal of the transistor and an other end grounded.
References Cited (Backward Citations)
US4107621A
Cited
JPS5415644A
Cited
JPS562447A
Cited
US5229732A
Cited
JPH03270405A
Cited
US5276406A
Cited
US5406224A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-04-06 | 2001-10-06 | 2002-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-04-06 | 2005-10-06 | 2006-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-04-06 | 2009-10-06 | 2010-04-07 | $7700.00 | Window Closed / Lapsed |