Patent US5315265A successfully refreshed from Google Patents.
US5315265A
Expired / Lapsed
US
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Low intermodulation distortion FET amplifier using parasitic resonant matching
Assignee: ZOLTAR ACQUISITION Inc A Corp OF NORTH CAROLINA
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Filing: 1992-12-11
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Granted: 1994-05-24
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Expires: 2012-12-11
Abstract
Abstract An RF power FET amplifier is designed using parasitic resonant matching to reduce low intermodulation distortion. An input inductor is connected in parallel with the capacitance of the common-source input capacitance, an output inductor is connected in parallel with the common-source output capacitance. Feedback provided by the common-source capacitance between gate and drain is utilized to improve linearization and stability. The field effect transistor is designed so that the feedback signal resulting from the feedback capacitance is 180° with respect to the forward gain.
Inventors
- 👤 David S. Wisherd
- 👤 William H. McCalpin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:39
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/32; H03F1/3205; H03F3/00; H03F3/189; H03F3/19; H03F3/193
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
170 words
An RF power amplifier comprising: a field effect transistor having a source, a drain, and a gate, a common-source input capacitance and a common-source output capacitance, input circuit means for connecting an RF signal source having source resistance across said gate and said source, said input circuit means including an input inductor having a positive input reactance connected across said gate and said source, the reactance of said input inductor being equal in magnitude to the reactance of the common-source input capacitance, output circuit means for connecting a load having a load resistance across said drain and said source, said output circuit means including an output inductor having a positive output reactance connected across said drain and said source, the reactance of said output inductor being equal in magnitude to the reactance of the common-source output capacitance, and a negative feedback provided by a common-source capacitance between said gate and said drain, a feedback signal provided by said negative feedback being 180° with respect to forward gain of said amplifier.
Claim 2
Dependent Claim
170 words
An RF power amplifier comprising: a field effect transistor having a source, a drain, and a gate, a common-source input capacitance and a common-source output capacitance, input circuit means for connecting an RF signal source having source resistance across said gate and said source, said input circuit means including an input inductor having a positive input reactance connected across said gate and said source, the reactance of said input inductor being equal in magnitude to the reactance of the common-source input capacitance, output circuit means for connecting a load having a load resistance across said drain and said source, said output circuit means including an output inductor having a positive output reactance connected across said drain and said source, the reactance of said output inductor being equal in magnitude to the reactance of the common-source output capacitance, and a negative feedback provided by a common-source capacitance between said gate and said drain, a feedback signal provided by said negative feedback being 180° with respect to forward gain of said amplifier.
Claim 3
Dependent Claim
35 words
The RF power amplifier as defined by claim 1 wherein said input circuit means includes an input resistor equal to the input resistance of said gate and source when said field effect transistor is conducting.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-05-23 | 1997-11-22 | 1998-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-23 | 2001-11-22 | 2002-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-23 | 2005-11-22 | 2006-05-24 | $7700.00 | Window Closed / Lapsed |