Patent US5424685A successfully refreshed from Google Patents.
US5424685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-level modulator with bipolar modulation reference
Assignee: Boeing North American Inc
•
Filing: 1994-02-10
•
Granted: 1995-06-13
•
Expires: 2014-02-10
Abstract
Abstract A bipolar modulator and its associated control devices for use with a high-efficiency amplifier in an RF transmitter. The modulator receives an inverted reference signal that has passed through at least two comparators. The modulator output is filtered and then rectified and coupled to a high-efficiency power amplifier.
Inventors
- 👤 Daniel M. Mitchell
- 👤 Timothy L. Kean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:03
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3036; H03G3/3042; H03F; H03F1/00; H03F1/02; H03F1/0205; H03F1/0211; H03F1/0216; H03F1/0233
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
78 words
An apparatus for use with a high-efficiency power amplifier comprising: means for determining an inverted signal; modulator means coupled to said means for determining the inverted signal; filtering means coupled to said modulator means output signal; and means for rectifying the signal routed through the means for filtering, said means for rectifying coupled to the high-efficiency power amplifier; wherein the means for rectifying the output signal of the means for modulating is set to the modulator means frequency.
Claim 2
Independent Claim
78 words
An apparatus for use with a high-efficiency power amplifier comprising: means for determining an inverted signal; modulator means coupled to said means for determining the inverted signal; filtering means coupled to said modulator means output signal; and means for rectifying the signal routed through the means for filtering, said means for rectifying coupled to the high-efficiency power amplifier; wherein the means for rectifying the output signal of the means for modulating is set to the modulator means frequency.
Claim 3
Dependent Claim
50 words
The apparatus of claim 1 wherein the means for determining an inverted signal is comprised of an error voltage amplifier that receives a first inverted input signal from the high-efficiency power amplifier and an inverted reference signal that serves as a reference input signal against the first inverted input signal.
Claim 4
Dependent Claim
33 words
The apparatus of claim 2 wherein an output signal from the means for determining an inverted signal and a feedback signal from the modulator means, are each coupled through full wave rectification means.
Claim 5
Independent Claim
158 words
A method of providing a high-efficiency power amplifier a high-level modulated signal of maximum system efficiency comprising the steps of: coupling a first inverted reference signal to a first comparator; coupling a second inverted signal, from an envelope detector that is coupled to the high-efficiency powder amplifier to the first comparator; comparing the first and second inverted signals for determining an error value between the said signals: coupling the output signal of the first comparator to a first input terminal of a second comparator: coupling a feedback signal from a modulator to a second input terminal of the second comparator; comparing the output signal and the feedback signal for determining an error value between said output signal and said feedback signal; modulating the output of the second comparator; filtering the modulator output signal to attenuate switching noise; and rectifying the output signal of the filtered modulated output signal prior to coupling such signal to the high-efficiency power amplifier.
Claim 6
Independent Claim
158 words
A method of providing a high-efficiency power amplifier a high-level modulated signal of maximum system efficiency comprising the steps of: coupling a first inverted reference signal to a first comparator; coupling a second inverted signal, from an envelope detector that is coupled to the high-efficiency powder amplifier to the first comparator; comparing the first and second inverted signals for determining an error value between the said signals: coupling the output signal of the first comparator to a first input terminal of a second comparator: coupling a feedback signal from a modulator to a second input terminal of the second comparator; comparing the output signal and the feedback signal for determining an error value between said output signal and said feedback signal; modulating the output of the second comparator; filtering the modulator output signal to attenuate switching noise; and rectifying the output signal of the filtered modulated output signal prior to coupling such signal to the high-efficiency power amplifier.
Claim 7
Dependent Claim
31 words
The method of claim 4 further comprising the step of full-wave rectifying said output signal of the first comparator and said feedback signal prior to coupling each to the second comparator.
References Cited (Backward Citations)
US4631491A
Cited
US5023937A
Cited
US4933986A
Cited
US4994757A
Cited
US5121077A
Cited
US5124665A
Cited
US5119040A
Cited
US5111158A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-06-12 | 1998-12-12 | 1999-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-06-12 | 2002-12-12 | 2003-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-06-12 | 2006-12-12 | 2007-06-13 | $7700.00 | Window Closed / Lapsed |