US4985686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Active load impedance control system for radio frequency power amplifiers
Assignee: Motorola Solutions Inc
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Filing: 1989-12-04
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Granted: 1991-01-15
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Expires: 2009-12-04
Abstract
Abstract An active load impedance control system for a radio frequency power amplifier comprising an amplification means for amplifying radio frequency signals and providing a forward signal, a control means responsive to the operating conditions of said amplification means, a correction signal means responsive to the control means for providing an amplitude, a sampling means and phase controlled corrective reflective signal and a combining means for combining said forward signal and said corrective reflective signal.
Inventors
- 👤 Robert P. Davidson
- 👤 Richard A. Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:03
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/02; H04B1/04; H04B1/0458; H03; H03F; H03F1/00; H03F1/32; H03F1/3223
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
An active load impedance control system for a radio frequency power amplifier comprising: amplification means for amplifying radio frequency signals and providing forward signal; control means responsive to the operating conditions of said amplification means, correction signal means responsive to the control means for providing an amplitude and phase controlled corrective reflective signal. combining means for combining said forward signal and said corrective reflective signal.
Claim 2
Dependent Claim
65 words
An active load impedance control system for a radio frequency power amplifier comprising: amplification means for amplifying radio frequency signals and providing forward signal; control means responsive to the operating conditions of said amplification means, correction signal means responsive to the control means for providing an amplitude and phase controlled corrective reflective signal. combining means for combining said forward signal and said corrective reflective signal.
Claim 3
Dependent Claim
33 words
The active load impedance control system for the radio frequency power amplifier for claim 1 wherein said combining means includes at least one circulator for combining said forward signal said corrective reflective signal.
Claim 4
Dependent Claim
23 words
The active load impedance control system for the radio frequency power amplifier of claim 1, wherein said control means includes micro-processor control circuitry.
Claim 5
Dependent Claim
34 words
The active load impedance control system for the radio frequency power amplifier of claim 1, wherein said control means is responsive to changes in the output of said amplifier, supply voltage and operating frequency.
Claim 6
Dependent Claim
32 words
The active load impedance control system for radio frequency power amplifier of claim 1 wherein, said correction signal means includes a variable attenuator for varying the amplitude of said corrective reflective signal.
Claim 7
Dependent Claim
31 words
The active load impedance control system for radio frequency power amplifier of claim 1, wherein said correction signal means includes a phase shifter for shifting the phase said corrective reflective signal.
Claim 8
Dependent Claim
31 words
The active load impedance control system for radio frequency power amplifier for claim 1, wherein said correction signal means includes an amplifier to vary the gain of said corrective reflective signal.
References Cited (Backward Citations)
US4493112A
Cited
US4439741A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-14 | 1994-07-16 | 1995-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-14 | 1998-07-16 | 1999-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-14 | 2002-07-16 | 2003-01-15 | $7700.00 | Window Closed / Lapsed |