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US6005441A
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Amplifying circuit
Assignee: Mitsubishi Electric Corp
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Filing: 1998-05-26
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Granted: 1999-12-21
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Expires: 2018-05-26
Abstract
Abstract An amplifying circuit has a feedback reactance element connected across a biasing feedback resistor and an input terminal for suppressing feedback of thermal noise generated by the biasing feedback resistor.
Inventors
- 👤 Tadashi Kawahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:48
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/189; H03F3/19; H03F1/00; H03F1/26; H03F2200/00; H03F2200/372
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
160 words
An amplifying circuit for amplifying an input signal input to an input terminal and outputting an amplified signal from an output terminal, said amplifying circuit comprising: a junction transistor connected between the input terminal and the output terminal; a matching reactance element having an impedance and connected between and to the input terminal and a base electrode of the junction transistor for input impedance matching; a feedback circuit including a resistor and a feedback reactance connected in series for feeding back a signal having a phase inverted relative to the input signal, from the output terminal to a node located between the input terminal and the matching reactance element; and a bias network comprising a first bias resistor connected between and to the input terminal and a power supply terminal and a bias circuit comprising a second bias resistor and a bias stabilizing capacitor connected in series, the bias circuit being connected between and to the input terminal and ground.
Claim 2
Dependent Claim
160 words
An amplifying circuit for amplifying an input signal input to an input terminal and outputting an amplified signal from an output terminal, said amplifying circuit comprising: a junction transistor connected between the input terminal and the output terminal; a matching reactance element having an impedance and connected between and to the input terminal and a base electrode of the junction transistor for input impedance matching; a feedback circuit including a resistor and a feedback reactance connected in series for feeding back a signal having a phase inverted relative to the input signal, from the output terminal to a node located between the input terminal and the matching reactance element; and a bias network comprising a first bias resistor connected between and to the input terminal and a power supply terminal and a bias circuit comprising a second bias resistor and a bias stabilizing capacitor connected in series, the bias circuit being connected between and to the input terminal and ground.
Claim 3
Dependent Claim
24 words
The amplifying circuit according to claim 1, wherein the feedback reactance element has an impedance larger than the impedance of the matching reactance element.
Claim 4
Dependent Claim
35 words
The amplifying circuit according to claim 1, wherein the amplifying circuit is monolithically formed on a silicon substrate, and the matching reactance element and the feedback reactance element are spiral inductors having coplanar wiring patterns.
Claim 5
Dependent Claim
35 words
The amplifying circuit according to claim 1, wherein the amplifying circuit is monolithically formed on a silicon substrate, and the matching reactance element and the feedback reactance element are comb-shaped inductors having coplanar wiring patterns.
References Cited (Backward Citations)
JPS5341963A
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JPS60177710A
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JPS60189304A
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JPS60248009A
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JPS6451704A
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US5051705A
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US5117203A
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JPH07263977A
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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) | 2002-12-20 | 2003-06-21 | 2003-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-12-20 | 2007-06-21 | 2007-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-12-20 | 2011-06-21 | 2011-12-21 | $7700.00 | Window Closed / Lapsed |