Patent US5613233A successfully refreshed from Google Patents.
US5613233A
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Apparatus with distortion cancelling feedback signal
Assignee: Boeing North American Inc
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Filing: 1994-09-30
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Granted: 1997-03-18
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Expires: 2014-09-30
Abstract
Abstract An apparatus having a distortion cancelling feedback signal that suppresses undesired signal components. One embodiment of the present invention is comprised of a balanced mixer coupled to a common-mode detector, a filter and having a resulting feedback signal that suppresses the common-mode component of the mixer output signal while allowing the differential component of the mixer output signal to pass on to additional processing.
Inventors
- 👤 Michael R. Vagher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:11
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/32; H03F1/3211; H03D; H03D7/00; H03D7/14; H03D7/1425; H03D7/1433; H03D7/1458; H03D7/1491; H03D7/16; H03D7/165; H03F3/00; H03F3/45; H03F3/45071; H03F3/45076; H03F3/4508; H03F3/45085; H03F3/45089; H03F3/45479; H03F3/45484; H03F3/45488; H03F3/45493; H03F3/45502; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/30; H03F2203/00; H03F2203/45; H03F2203/45311; H03F2203/45392; H03F2203/45418; H03F2203/45424; H03F2203/45441; H03F2203/45466; H03F2203/45476; H03F2203/45496; H03F2203/45638; H03F2203/45702
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
128 words
An apparatus having a closed-loop control signal for suppressing common-mode signal distortion comprising: a balanced mixer having an output signal with a differential and a common-mode component; a low-pass filter coupled to the output signal of the balanced mixer having characteristics that pass baseband frequency signals of the balanced mixer output signal; a level shift detector coupled to the passed signals of the low-pass filter, thereby yielding an extracted signal; a common-mode detector coupled to the level shift detector extracted signal that suppresses the common-mode component of the extracted signal; a voltage controlled current source having an input signal from the common-mode detector and having its output signal coupled to the balanced mixer; and an amplifier disposed between and coupled to the common-mode detector and the current source.
Claim 2
Independent Claim
128 words
An apparatus having a closed-loop control signal for suppressing common-mode signal distortion comprising: a balanced mixer having an output signal with a differential and a common-mode component; a low-pass filter coupled to the output signal of the balanced mixer having characteristics that pass baseband frequency signals of the balanced mixer output signal; a level shift detector coupled to the passed signals of the low-pass filter, thereby yielding an extracted signal; a common-mode detector coupled to the level shift detector extracted signal that suppresses the common-mode component of the extracted signal; a voltage controlled current source having an input signal from the common-mode detector and having its output signal coupled to the balanced mixer; and an amplifier disposed between and coupled to the common-mode detector and the current source.
Claim 3
Dependent Claim
19 words
The apparatus of claim 1, further comprising a loop compensation filter coupled to the amplifier and the current source.
Claim 4
Independent Claim
94 words
A method for suppressing distortion in a RF receiver comprising the following steps: mixing a received RF signal with an output signal of a local oscillator thereby creating an intermediate signal; filtering the local oscillator and RF frequencies from the intermediate signal; extracting the resultant signal of the filtering step; suppressing common-mode component of the RF signal at the resultant extracted signal; amplifying the resultant signal of the suppressing step; and electrically coupling the resultant signal of the suppressed extracted signal to a current source that provides a current signal to the mixing step.
Claim 5
Independent Claim
94 words
A method for suppressing distortion in a RF receiver comprising the following steps: mixing a received RF signal with an output signal of a local oscillator thereby creating an intermediate signal; filtering the local oscillator and RF frequencies from the intermediate signal; extracting the resultant signal of the filtering step; suppressing common-mode component of the RF signal at the resultant extracted signal; amplifying the resultant signal of the suppressing step; and electrically coupling the resultant signal of the suppressed extracted signal to a current source that provides a current signal to the mixing step.
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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) | 2000-03-17 | 2000-09-16 | 2001-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-03-17 | 2004-09-16 | 2005-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-03-17 | 2008-09-16 | 2009-03-18 | $7700.00 | Window Closed / Lapsed |