US5095285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monolithically realizable harmonic trapping circuit
Assignee: Texas Instruments Inc
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Filing: 1990-08-31
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Granted: 1992-03-10
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Expires: 2010-08-31
Abstract
Abstract A monolithically realizable harmonic trapping circuit that is a shunt connected series-resonant inductor-capacitor combination which has a resonant frequency designed to coincide with an undesired harmonic frequency of a desired fundamental frequency signal.
Inventors
- 👤 M. Ali Khatibzadeh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:25
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/60; H03F1/00; H03F1/32; H03H; H03H7/00; H03H7/01; H03H7/17; H03H7/1741; H03H7/1758; H03H7/38; H03H2007/013
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
141 words
An amplifier incorporating a monolithically realizable harmonic trapping circuit, said harmonic trapping circuit comprising: an input terminal for receiving a desired radio frequency (RF) signal and its undesired harmonics; inductive means having a first terminal connected to said input terminal; capacitive means connected between a second terminal of said inductive means and ground; and an inductance of said inductive means and a capacitance of said capacitive means being of predetermined magnitudes to cause the series connection of said inductive means and said capacitive means to have a resonant frequency which is equal to a selected one of said undesired harmonics of said desired RF signal, thereby short circuiting said selected one of said undesired harmonics to ground, wherein a total capacitance of said harmonic trapping circuit at a non-resonant frequency is compensated for in an output matching circuit of said amplifier.
Claim 2
Dependent Claim
141 words
An amplifier incorporating a monolithically realizable harmonic trapping circuit, said harmonic trapping circuit comprising: an input terminal for receiving a desired radio frequency (RF) signal and its undesired harmonics; inductive means having a first terminal connected to said input terminal; capacitive means connected between a second terminal of said inductive means and ground; and an inductance of said inductive means and a capacitance of said capacitive means being of predetermined magnitudes to cause the series connection of said inductive means and said capacitive means to have a resonant frequency which is equal to a selected one of said undesired harmonics of said desired RF signal, thereby short circuiting said selected one of said undesired harmonics to ground, wherein a total capacitance of said harmonic trapping circuit at a non-resonant frequency is compensated for in an output matching circuit of said amplifier.
Claim 3
Dependent Claim
25 words
The amplifier of claim 1, wherein: said inductive means is formed on a semiconductor surface; and said capacitive means is formed on said semiconductor surface.
Claim 4
Dependent Claim
10 words
The amplifier of claim 2, wherein: said semiconductor is GaAs.
Claim 5
Dependent Claim
14 words
The amplifier of claim 2, wherein said inductive means is a planar spiral inductor.
Claim 6
Dependent Claim
16 words
The amplifier of claim 1, wherein said one of said undesired harmonics is a second harmonic.
Claim 7
Dependent Claim
27 words
The amplifier of claim 1, wherein: said inductive means is formed on a first semiconductor surface; and said capacitive means is formed on a second semiconductor surface.
Claim 8
Dependent Claim
16 words
The amplifier of claim 2 wherein said semiconductor surface is a surface of an epitaxial layer.
Claim 9
Dependent Claim
28 words
The amplifier of claim 6 wherein: said first semiconductor surface is a surface of a substrate; and said second semiconductor surface is a surface of an epitaxial layer.
Claim 10
Dependent Claim
176 words
Am amplifier incorporating a monolithically realizable harmonic trapping circuit, said harmonic trapping circuit comprising: an input terminal for receiving a desired radio frequency (RF) signal and its undesired harmonics; a plurality of inductive means having first terminals connected to said input terminal; a plurality of capacitive means, each one of said plurality of capacitive means connected, respectively, between a second terminal of each one of said plurality of inductive means and ground; and a plurality of respective inductances of said plurality of inductive means and a plurality of respective capacitances of said plurality of capacitive means being of predetermined magnitudes to cause the series connection of respective ones of said inductive means and respective ones of said capacitive means to have respective resonant frequencies which are equal to a respective one of said undesired harmonics of said desired RF signal, thereby short circuiting said respective ones of said undesired harmonics to ground, wherein a total capacitance of said harmonic trapping circuit at a non-resonant frequency is compensated for in an output matching circuit of said amplifier.
Claim 11
Dependent Claim
176 words
Am amplifier incorporating a monolithically realizable harmonic trapping circuit, said harmonic trapping circuit comprising: an input terminal for receiving a desired radio frequency (RF) signal and its undesired harmonics; a plurality of inductive means having first terminals connected to said input terminal; a plurality of capacitive means, each one of said plurality of capacitive means connected, respectively, between a second terminal of each one of said plurality of inductive means and ground; and a plurality of respective inductances of said plurality of inductive means and a plurality of respective capacitances of said plurality of capacitive means being of predetermined magnitudes to cause the series connection of respective ones of said inductive means and respective ones of said capacitive means to have respective resonant frequencies which are equal to a respective one of said undesired harmonics of said desired RF signal, thereby short circuiting said respective ones of said undesired harmonics to ground, wherein a total capacitance of said harmonic trapping circuit at a non-resonant frequency is compensated for in an output matching circuit of said amplifier.
Claim 12
Dependent Claim
33 words
The amplifier of claim 9, wherein: each of said plurality of inductive means is formed on a semiconductor surface; and each of said plurality of capacitive means is formed on said semiconductor surface.
Claim 13
Dependent Claim
10 words
The amplifier of claim 10, wherein: said semiconductor is GaAs.
Claim 14
Dependent Claim
19 words
The amplifier of claim 10, wherein each of said plurality of said inductive means is a planar spiral inductor.
Claim 15
Dependent Claim
31 words
The amplifier of claim 9, wherein: said plurality of inductive means is formed on a first semiconductor surface; and said plurality of capacitive means is formed on a second semiconductor surface.
Claim 16
Dependent Claim
16 words
The amplifier of claim 10 wherein said semiconductor surface is a surface of an epitaxial layer.
Claim 17
Dependent Claim
28 words
The amplifier of claim 13 wherein: said first semiconductor surface is a surface of a substrate; and said second semiconductor surface is a surface of an epitaxial layer.
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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) | 1995-03-10 | 1995-09-09 | 1996-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-10 | 1999-09-09 | 2000-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-10 | 2003-09-09 | 2004-03-10 | $7700.00 | Window Closed / Lapsed |