GB0822489D0 - Quadrature pulse-width modulation methods and apparatus - Google Patents
Quadrature pulse-width modulation methods and apparatusInfo
- Publication number
- GB0822489D0 GB0822489D0 GBGB0822489.1A GB0822489A GB0822489D0 GB 0822489 D0 GB0822489 D0 GB 0822489D0 GB 0822489 A GB0822489 A GB 0822489A GB 0822489 D0 GB0822489 D0 GB 0822489D0
- Authority
- GB
- United Kingdom
- Prior art keywords
- width modulation
- modulation methods
- quadrature pulse
- quadrature
- pulse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/217—Class D power amplifiers; Switching amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
- H03F1/3294—Acting on the real and imaginary components of the input signal
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/217—Class D power amplifiers; Switching amplifiers
- H03F3/2173—Class D power amplifiers; Switching amplifiers of the bridge type
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/08—Duration or width modulation ; Duty cycle modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
- H04L25/4902—Pulse width modulation; Pulse position modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/336—A I/Q, i.e. phase quadrature, modulator or demodulator being used in an amplifying circuit
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/351—Pulse width modulation being used in an amplifying circuit
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Nonlinear Science (AREA)
- Amplifiers (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US1282707P | 2007-12-11 | 2007-12-11 | |
US12/135,326 US8179957B2 (en) | 2007-12-11 | 2008-06-09 | Quadrature pulse-width modulation methods and apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
GB0822489D0 true GB0822489D0 (en) | 2009-01-14 |
GB2456889A GB2456889A (en) | 2009-08-05 |
Family
ID=40289773
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB0822489A Withdrawn GB2456889A (en) | 2007-12-11 | 2008-12-10 | A PWM modulator for a Cartesian transmitter |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2456889A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114172497A (en) * | 2021-12-06 | 2022-03-11 | 中国人民解放军国防科技大学 | 5-level radio frequency pulse width modulation method and modulator without spectrum aliasing |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2424115B1 (en) * | 2010-08-23 | 2017-03-08 | Alcatel Lucent | A method for pulse length modulation of signals using calibration signals, and a modulation device therefor |
EP2575309B1 (en) * | 2011-09-22 | 2014-11-05 | Alcatel Lucent | A method for pulse width modulation, and a transmitter therefor |
US9543910B2 (en) | 2015-03-06 | 2017-01-10 | Apple Inc. | Radio frequency system switching power amplifier systems and methods |
EP3211800B1 (en) | 2016-02-25 | 2019-10-16 | Huawei Technologies Co., Ltd. | Signal processing arrangement for a transmitter |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB977806A (en) * | 1962-06-13 | 1964-12-16 | Ferguson Radio Corp | A linear pulse width modulator |
WO2007083281A1 (en) * | 2006-01-23 | 2007-07-26 | Nxp B.V. | Cartesian modulation system via multi-level pulse width modulation |
JP5006403B2 (en) * | 2006-10-27 | 2012-08-22 | テレフオンアクチーボラゲット エル エム エリクソン(パブル) | Switch modulation of radio frequency amplifiers |
WO2008076021A1 (en) * | 2006-12-18 | 2008-06-26 | Telefonaktiebolaget Lm Ericsson (Publ) | Pulse width modulator |
-
2008
- 2008-12-10 GB GB0822489A patent/GB2456889A/en not_active Withdrawn
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114172497A (en) * | 2021-12-06 | 2022-03-11 | 中国人民解放军国防科技大学 | 5-level radio frequency pulse width modulation method and modulator without spectrum aliasing |
CN114172497B (en) * | 2021-12-06 | 2023-08-15 | 中国人民解放军国防科技大学 | Spectrum aliasing-free 5-level radio frequency pulse width modulation method and modulator |
Also Published As
Publication number | Publication date |
---|---|
GB2456889A (en) | 2009-08-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |