US6466095B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power amplifier
Assignee: NEC Corp
•
Filing: 1999-07-02
•
Granted: 2002-10-15
•
Expires: 2019-07-02
Abstract
Abstract To provide a variable gain power amplifier with wide dynamic range of transmission power, wherein power efficiency is high, distortion in the linearity is low. In an amplifier with a plurality of transistors connected with cascade, the source of transistor ( 103 ) is grounded, the gate of transistor ( 108 ) of an output stage is grounded. Further, source bias terminal ( 109 ) and drain bias terminal ( 110 ) is provided for applying prescribed voltages to the source and drain of transistor ( 108 ) of the output stage, respectively. The electric power inputted into transistor ( 108 ) of the output stage is passed through without being amplified by applying the prescribed voltages to source bias terminal ( 109 ) and drain bias terminal ( 110 ), respectively, when the electric power outputted from the output stage is made smaller than a prescribed threshold.
Inventors
- 👤 Yasuyuki Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:40
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/60; H03F3/601; H03F1/00; H03F1/08; H03F1/22; H03F1/226; H03G; H03G1/00; H03G1/0005; H03G1/0017; H03G1/0029
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
105 words
A power amplifier with a plurality of transistors connected in cascade which comprises: an input stage including one or more FETs with grounded sources; an output stage including one or more FETs with grounded gates; and a plurality of bias terminals connected with the sources and drains of said transistors in said output stage, which is characterized in that the power inputted into said output stage is allowed to go through without being amplified from the output terminal of said output stage, by applying a control voltage to said bias terminals, when the output power from said output stage is smaller than a prescribed threshold.
Claim 2
Dependent Claim
105 words
A power amplifier with a plurality of transistors connected in cascade which comprises: an input stage including one or more FETs with grounded sources; an output stage including one or more FETs with grounded gates; and a plurality of bias terminals connected with the sources and drains of said transistors in said output stage, which is characterized in that the power inputted into said output stage is allowed to go through without being amplified from the output terminal of said output stage, by applying a control voltage to said bias terminals, when the output power from said output stage is smaller than a prescribed threshold.
Claim 3
Dependent Claim
107 words
A power amplifier with a plurality of transistors connected in cascade which comprises: an input stage including one or more bipolar transistors with grounded emitters; an output stage including one or more bipolar transistors with grounded bases; and a plurality of bias terminals connected with the emitters and collectors of said transistors in said output stage, which is characterized in that the power inputted into said output stage is allowed to go through without being amplified from the output terminal of said output stage, by applying a control voltage to said bias terminals, when the output power from said output stage is smaller than a prescribed threshold.
Claim 4
Dependent Claim
107 words
A power amplifier with a plurality of transistors connected in cascade which comprises: an input stage including one or more bipolar transistors with grounded emitters; an output stage including one or more bipolar transistors with grounded bases; and a plurality of bias terminals connected with the emitters and collectors of said transistors in said output stage, which is characterized in that the power inputted into said output stage is allowed to go through without being amplified from the output terminal of said output stage, by applying a control voltage to said bias terminals, when the output power from said output stage is smaller than a prescribed threshold.
Claim 5
Dependent Claim
81 words
A power amplifier with a plurality of transistors connected in cascade which comprises: at least two FETs with grounded gates; and a plurality of bias terminals connected with the sources and drains of said FETs, which is characterized in that the power inputted into at least one of said FETs is allowed to go through without being amplified, by applying a control voltage to the bias terminals when the output power from said power amplifier is smaller than a prescribed threshold.
Claim 6
Dependent Claim
81 words
A power amplifier with a plurality of transistors connected in cascade which comprises: at least two FETs with grounded gates; and a plurality of bias terminals connected with the sources and drains of said FETs, which is characterized in that the power inputted into at least one of said FETs is allowed to go through without being amplified, by applying a control voltage to the bias terminals when the output power from said power amplifier is smaller than a prescribed threshold.
Claim 7
Dependent Claim
82 words
A power amplifier with a plurality of transistors connected with cascade which comprises: at least two bipolar transistors with grounded bases; and a plurality of bias terminals connected with the emitters and collectors of said bipolar transistors, characterized in that the power inputted into at least one of said bipolar transistors is allowed to go through without being amplified, by applying a control voltage to said bias terminals, when the output power from said power amplifier is smaller than a prescribed threshold.
Claim 8
Dependent Claim
82 words
A power amplifier with a plurality of transistors connected with cascade which comprises: at least two bipolar transistors with grounded bases; and a plurality of bias terminals connected with the emitters and collectors of said bipolar transistors, characterized in that the power inputted into at least one of said bipolar transistors is allowed to go through without being amplified, by applying a control voltage to said bias terminals, when the output power from said power amplifier is smaller than a prescribed threshold.
Claim 9
Dependent Claim
113 words
The power amplifier according to claim 3 , wherein which further comprises: a first input output matching circuit which is connected with said FET with grounded gate of said input stage, and which makes a linear gain of said FET with grounded gate of said input stage greater than a linear gain of said FET with grounded gate of said output stage; and a second input output matching circuit which is connected with said FET with grounded gate of said output stage, and which makes an output power of said FET with grounded gate of said output stage greater than an output power of said FET with grounded gate of said input stage.
Claim 10
Dependent Claim
119 words
The power amplifier according to claim 4 , wherein which further comprises: a first input output matching circuit which is connected with said bipolar transistor with grounded base of said input stage, and which makes a linear gain of said bipolar transistor with grounded base of said input stage greater than a linear gain of said bipolar transistor with grounded base of said output stage; and a second input output matching circuit which is connected with said bipolar transistor with grounded base of said output stage, and which makes an output power of said bipolar transistor with grounded base of said output stage greater than an output power of said bipolar transistor with grounded base of said input stage.
References Cited (Backward Citations)
US4041412A
Cited
US4119923A
Cited
JPS57160213A
Cited
US4658220A
Cited
JPH05145349A
Cited
JPH05308233A
Cited
JPH06224647A
Cited
JPH07245529A
Cited
JPH0865057A
Cited
JPH09148852A
Cited
US5926069A
Cited
US6028487A
Cited
US5966051A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-10-14 | 2006-04-15 | 2006-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-10-14 | 2010-04-15 | 2010-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-10-14 | 2014-04-15 | 2014-10-15 | $7700.00 | Window Closed / Lapsed |