US6639466B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifier bias adjustment circuit to maintain high-output third-order intermodulation distortion performance
Assignee: Skyworks Solutions Inc
•
Filing: 2002-06-11
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Granted: 2003-10-28
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Expires: 2022-06-11
Abstract
Abstract An circuit and method are provided for amplifying RF input signal to produce RF output signals with third-order intermodulation distortion products. The circuit and method use a feedback signal to control the bias voltage of the amplifier, such that the output third-order intermodulation distortion product increases monotonically with the RF input signal power. Specifically, the third-order intermodulation distortion product responds over a predetermined output power range by increasing three decibels in response to each one-decibel increase in input power.
Inventors
- 👤 Douglas Matthew Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:08
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/02; H03F1/0205; H03F1/0261; H03F1/0272; H03F3/00; H03F3/189; H03F3/19; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3036; H03G3/3042
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
155 words
A circuit for amplifying an input RF signal comprising: (a) an RE amplifier having an input port that receives such input RF signal and an output port, wherein said RE amplifier produces at said output port an amplified RE signal comprising a third-order intermodulation distortion product signal; (b) a power divider that is connected to said output port of said RE amplifier to divide said amplified RF signal into an output RE signal and a feedback signal; and (c) a feedback circuit connected to said power divider to detect said feedback signal and to produce a DC voltage that is proportional to the power of said feedback signal and that is used to bias said RF amplifier circuit; wherein said DC voltage causes said third-order intermodulation distortion product signal to increase in response to an increase in the level of said input RF signal over a predetermined range of power of said output RF signal.
Claim 2
Dependent Claim
155 words
A circuit for amplifying an input RF signal comprising: (a) an RE amplifier having an input port that receives such input RF signal and an output port, wherein said RE amplifier produces at said output port an amplified RE signal comprising a third-order intermodulation distortion product signal; (b) a power divider that is connected to said output port of said RE amplifier to divide said amplified RF signal into an output RE signal and a feedback signal; and (c) a feedback circuit connected to said power divider to detect said feedback signal and to produce a DC voltage that is proportional to the power of said feedback signal and that is used to bias said RF amplifier circuit; wherein said DC voltage causes said third-order intermodulation distortion product signal to increase in response to an increase in the level of said input RF signal over a predetermined range of power of said output RF signal.
Claim 3
Dependent Claim
47 words
The circuit of claim 1 , wherein said DC voltage causes said third-order intermodulation distortion product signal to increase by a predictable amount in response to an increase in the level of said input RF signal over a predetermined range of power of said output RF signal.
Claim 4
Dependent Claim
44 words
The circuit of claim 2 , wherein said DC voltage causes said third-order intermodulation distortion product signal to increase monotonically in response to an increase in the level of said input RF signal over a predetermined range of power of said output RE signal.
Claim 5
Independent Claim
115 words
A method for amplifying an input RF signal comprising the steps of: (a) amplifying said input RF signal in an amplifier to produce an amplified signal; (b) dividing said amplified signal into an output RF signal and a feedback signal, said output RF signal comprising a third-order intermodulation distortion product signal; (c) generating a DC signal with a DC voltage proportional to the power of said feedback signal; and (d) biasing said amplifier based on said DC signal; wherein the DC voltage causes said third-order intermodulation distortion product signal to increase in response to an increase in the level of said input RF signal over a predetermined range of power of said output RF signal.
Claim 6
Independent Claim
115 words
A method for amplifying an input RF signal comprising the steps of: (a) amplifying said input RF signal in an amplifier to produce an amplified signal; (b) dividing said amplified signal into an output RF signal and a feedback signal, said output RF signal comprising a third-order intermodulation distortion product signal; (c) generating a DC signal with a DC voltage proportional to the power of said feedback signal; and (d) biasing said amplifier based on said DC signal; wherein the DC voltage causes said third-order intermodulation distortion product signal to increase in response to an increase in the level of said input RF signal over a predetermined range of power of said output RF signal.
Claim 7
Dependent Claim
47 words
The method of claim 4 , wherein the DC voltage causes said third-order intermodulation distortion product signal to increase by a predictable amount in response to an increase in the level of said input RF signal over a predetermined range of power of said output RF signal.
Claim 8
Dependent Claim
44 words
The method of claim 5 , wherein the DC voltage causes said third-order intermodulation distortion product signal to increase monotonically in response to an increase in the level of said input RF signal over a predetermined range of power of said output RF signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2006-10-27 | 2007-04-28 | 2007-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-10-27 | 2011-04-28 | 2011-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-10-27 | 2015-04-28 | 2015-10-28 | $7700.00 | Window Closed / Lapsed |