Patent US6639466B2 successfully refreshed from Google Patents.
US6639466B2
Expired / Lapsed
US
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Amplifier bias adjustment circuit to maintain high-output third-order intermodulation distortion performance
Assignee: Skyworks Solutions Inc
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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 14:21
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.
References Cited (Backward Citations)
US3443241A
Cited
US3486128A
Cited
US3996524A
Cited
US4331930A
Cited
US4317083A
Cited
US4237425A
Cited
US4439743A
Cited
US4521740A
Cited
US4754231A
Cited
US4882547A
Cited
US5136257A
Cited
US4970456A
Cited
US5055797A
Cited
US5121081A
Cited
US5101175A
Cited
US5214393A
Cited
US5172068A
Cited
US5457811A
Cited
US5307512A
Cited
US5302913A
Cited
US5216379A
Cited
US5420536A
Cited
US5511239A
Cited
US5585762A
Cited
US5432473A
Cited
US5524285A
Cited
US5659893A
Cited
US5625322A
Cited
US5656972A
Cited
US5589796A
Cited
US5659253A
Cited
US5640691A
Cited
US5497123A
Cited
US5784689A
Cited
US5589797A
Cited
US5712593A
Cited
US5724005A
Cited
US5896064A
Cited
US5732334A
Cited
US6307436B1
Cited
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 |