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Patent US5973556A successfully refreshed from Google Patents.
US5973556A
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Delta-modulated power supply
Assignee: Keysight Technologies Inc
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Filing: 1998-09-18
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Granted: 1999-10-26
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Expires: 2018-09-18
Abstract
Abstract A delta-modulated magnitude amplifier is used to amplify the magnitude component of an RF power amplifier that employs envelope elimination and restoration. The delta-modulated amplifier introduces a smaller amount of non-linearity than traditional approaches, which are based upon pulse-width modulation. The disclosed technique can be implemented using switched-capacitor circuits in a standard MOS technology with only two external components, i.e., an inductor and a capacitor. Thus, the disclosed technique allows the implementation of an efficient and yet linear RF power amplifier using low-cost MOS technology.
Inventors
- 👤 David Su
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:48
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/02; H03F1/0205; H03F1/0211; H03F1/0216; H03F1/0222
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
106 words
A delta-modulated power supply, comprising: a difference detector for generating an output that depends on the difference between an input voltage and a feedback signal; a feedback path for coupling a power supply output voltage to said difference detector as said feedback signal; a quantizer coupled to said difference detector for generating a digital bit stream in which each bit is in one of two states depending on whether the output of said difference detector is greater than or less than a threshold level; and a non-linear amplifier coupled to said quantizer for current amplifying said digital bit stream to produce said power supply output voltage.
Claim 2
Dependent Claim
106 words
A delta-modulated power supply, comprising: a difference detector for generating an output that depends on the difference between an input voltage and a feedback signal; a feedback path for coupling a power supply output voltage to said difference detector as said feedback signal; a quantizer coupled to said difference detector for generating a digital bit stream in which each bit is in one of two states depending on whether the output of said difference detector is greater than or less than a threshold level; and a non-linear amplifier coupled to said quantizer for current amplifying said digital bit stream to produce said power supply output voltage.
Claim 3
Dependent Claim
24 words
The power supply of claim 1, additionally comprising a low pass filter for decoding the power supply output signal produced by said non-linear amplifier.
Claim 4
Dependent Claim
32 words
The power supply of claim 2, wherein said feedback path includes an attenuator to reduce the amplitude of said power supply output voltage to set the voltage gain of said power supply.
Claim 5
Dependent Claim
29 words
The power supply of claim 3, wherein said attenuator reduces the amplitude of said power supply output voltage so that it substantially equals the amplitude of said input voltage.
Claim 6
Dependent Claim
25 words
The power supply of claim 2, wherein said non-linear amplifier includes any one of a Class C, Class D, Class E, and Class F amplifier.
Claim 7
Dependent Claim
32 words
The power supply of claim 1, wherein said feedback path includes an attenuator to reduce the amplitude of said power supply output voltage to set the voltage gain of said power supply.
Claim 8
Dependent Claim
29 words
The power supply of claim 6, wherein said attenuator reduces the amplitude of said power supply output voltage so that it substantially equals the amplitude of said input voltage.
Claim 9
Dependent Claim
25 words
The power supply of claim 1, wherein said non-linear amplifier includes any one of a Class C, Class D, Class E, and Class F amplifier.
References Cited (Backward Citations)
US5352986A
Cited
US5847602A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-10-25 | 2003-04-26 | 2003-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-10-25 | 2007-04-26 | 2007-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-10-25 | 2011-04-26 | 2011-10-26 | $7700.00 | Window Closed / Lapsed |