Patent US5175879A successfully refreshed from Google Patents.
US5175879A
Expired / Lapsed
US
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Linear amplifier with feedback path and phase error compensation
Assignee: Motorola Solutions Inc
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Filing: 1991-04-25
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Granted: 1992-12-29
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Expires: 2011-04-25
Abstract
Abstract A linear amplifier comprising a feedback loop is stabilized by determining phase error between an error signal and a feedback signal and shifting the phase of a forward signal accordingly.
Inventors
- 👤 David B. Ellingson
- 👤 Walter J. Rozanski, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:37
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/34; H03F1/345; H03F1/32; H03F1/3241; H03F1/3247
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
109 words
A linear amplifier circuit having a forward signal path and a feedback signal path, comprising: a summer for providing an error signal by comparing an input signal and a feedback signal; an amplifier for amplifying a forward signal produced by said error signal and for providing an output signal; said output signal being fed back on the feedback signal path to produce said feedback signal; a phase detector being continuously coupled to said error signal and said feedback signal for providing a phase error signal; and a phase shifter for varying the phase of the forward signal on the forward signal path in response to said phase error signal.
Claim 2
Dependent Claim
109 words
A linear amplifier circuit having a forward signal path and a feedback signal path, comprising: a summer for providing an error signal by comparing an input signal and a feedback signal; an amplifier for amplifying a forward signal produced by said error signal and for providing an output signal; said output signal being fed back on the feedback signal path to produce said feedback signal; a phase detector being continuously coupled to said error signal and said feedback signal for providing a phase error signal; and a phase shifter for varying the phase of the forward signal on the forward signal path in response to said phase error signal.
Claim 3
Dependent Claim
38 words
The linear amplifier circuit of claim 1, further including: an up mixer for mixing up said error signal to produce said forward signal; and a down mixer for mixing down said output signal to produce said feedback signal.
Claim 4
Dependent Claim
26 words
The linear amplifier circuit of claim 2, wherein said error signal and said output signal are respectively mixed up and mixed down by a carrier signal.
Claim 5
Dependent Claim
18 words
The linear amplifier circuit of claim 3, wherein said phase shifter varies the phase of said carrier signal.
Claim 6
Dependent Claim
24 words
The linear amplifier circuit of claim 2, wherein said error signal is amplified by a baseband amplifier before being applied to said up mixer.
Claim 7
Dependent Claim
15 words
The linear amplifier circuit of claim 1, wherein said input signal comprises a complex signal.
Claim 8
Dependent Claim
28 words
The linear amplifier circuit of claim 1, further including an integrator for integrating the phase error signal for applying an integrated phase error signal to said phase shifter.
Claim 9
Dependent Claim
13 words
The linear amplifier circuit of claim 7, wherein said integrator comprises a microprocessor.
Claim 10
Dependent Claim
98 words
In a radio including means for transmitting communicating communication signals, a linear amplifier comprising: a summer for providing an error signal by comparing said input signal and a feedback signal; an amplifier for amplifying a forward signal produced by said error signal and for providing an output signal; said output signal being fed back to produce said feedback signal; a phase detector being continuously coupled to said error signal and said feedback signal for providing a phase error signal; and a phase shifter for varying the phase of said forward signal in response to said phase error signal.
Claim 11
Dependent Claim
98 words
In a radio including means for transmitting communicating communication signals, a linear amplifier comprising: a summer for providing an error signal by comparing said input signal and a feedback signal; an amplifier for amplifying a forward signal produced by said error signal and for providing an output signal; said output signal being fed back to produce said feedback signal; a phase detector being continuously coupled to said error signal and said feedback signal for providing a phase error signal; and a phase shifter for varying the phase of said forward signal in response to said phase error signal.
Claim 12
Dependent Claim
38 words
The linear amplifier circuit of claim 9, further including: an up mixer for mixing up said error signal to produce said forward signal; and a down mixer for mixing down said output signal to produce said feedback signal.
Claim 13
Dependent Claim
26 words
The linear amplifier circuit of claim 10; wherein said error signal and said output signal are respectively mixed up and mixed down by a carrier signal.
Claim 14
Dependent Claim
18 words
The linear amplifier circuit of claim 11, wherein said phase shifter varies the phase of said carrier signal.
Claim 15
Dependent Claim
24 words
The linear amplifier circuit of claim 10, wherein said error signal is amplified by a baseband amplifier before being applied to said up mixer.
Claim 16
Dependent Claim
15 words
The linear amplifier circuit of claim 9, wherein said input signal comprises a complex signal.
Claim 17
Dependent Claim
28 words
The linear amplifier circuit of claim 9, further including an integrator for integrating the phase error signal for applying an integrated phase error signal to said phase shifter.
Claim 18
Dependent Claim
13 words
The linear amplifier circuit of claim 15, wherein said integrator comprises a microprocessor.
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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) | 1995-12-29 | 1996-06-29 | 1996-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-29 | 2000-06-29 | 2000-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-29 | 2004-06-29 | 2004-12-29 | $7700.00 | Window Closed / Lapsed |