CA2638549A1 - Transmitting rf signals employing both digital and analog components with a common amplifier - Google Patents
Transmitting rf signals employing both digital and analog components with a common amplifier Download PDFInfo
- Publication number
- CA2638549A1 CA2638549A1 CA002638549A CA2638549A CA2638549A1 CA 2638549 A1 CA2638549 A1 CA 2638549A1 CA 002638549 A CA002638549 A CA 002638549A CA 2638549 A CA2638549 A CA 2638549A CA 2638549 A1 CA2638549 A1 CA 2638549A1
- Authority
- CA
- Canada
- Prior art keywords
- signal
- set forth
- amplifier
- digital
- analog components
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
- H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power 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
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0261—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the polarisation voltage or current, e.g. gliding Class A
- H03F1/0266—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the polarisation voltage or current, e.g. gliding Class A by using a signal derived from the input signal
-
- 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
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/04—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers
- H03F1/06—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers to raise the efficiency of amplifying modulated radio frequency waves; to raise the efficiency of amplifiers acting also as modulators
-
- 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
- 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
- H03F3/245—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages with semiconductor devices only
-
- 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
- H04L27/361—Modulation using a single or unspecified number of carriers, e.g. with separate stages of phase and amplitude modulation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C5/00—Amplitude modulation and angle modulation produced simultaneously or at will by the same modulating signal
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/18—Indexing scheme relating to amplifiers the bias of the gate of a FET being controlled by a control signal
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transmitters (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
Apparatus is presented for broadcasting an RF signal. This includes a signal divider that receives a composite RF signal and provides therefrom first and second signals each having digital and analog components. A phase extractor receives the first signal and provides therefrom a phase modulated RF signal for application to an amplifier. A gain controller varies the gain of the amplifier in accordance with amplitude variations of the second signal.
Claims (10)
1. Apparatus for broadcasting an RF signal comprising:
a signal divider that receives a composite RF signal and provides therefrom first and second signals each having digital and analog components;
an amplifier;
a phase extractor that receives said first signal and provides therefrom a phase modulated RF signal for application to said amplifier; and a gain controller that varies the gain of said amplifier in accordance with amplitude variations of said second signal.
a signal divider that receives a composite RF signal and provides therefrom first and second signals each having digital and analog components;
an amplifier;
a phase extractor that receives said first signal and provides therefrom a phase modulated RF signal for application to said amplifier; and a gain controller that varies the gain of said amplifier in accordance with amplitude variations of said second signal.
2. Apparatus as set forth in claim 1 wherein said composite RF signal includes digital and analog components.
3. Apparatus as set forth in claim 2 wherein said digital component includes vector modulated signals.
4. Apparatus as set forth in claim 3 wherein said gain controller includes an envelope extractor that extracts envelope variations of the vector modulated signal.
5. Apparatus as set forth in claim 4 wherein amplitude information representing the envelope variations is supplied to said amplifier.
6. Apparatus as set forth in claim 5 wherein said amplifier includes a control input.
7. Apparatus as set forth in claim 6 wherein said amplitude information is provided by superimposing a wide bandwidth signal representing the amplitude of said vector modulation to said control input.
8. Apparatus as set forth in claim 7 wherein said amplifier includes a vacuum tube and wherein said control input includes the control grid of said tube.
9. Apparatus as set forth in claim 8 wherein said control grid is screen grid.
10. Apparatus as set forth in claim 7 wherein said amplifier is a MOS-FET
transistor and wherein said control input includes a gate electrode of said transistor.
transistor and wherein said control input includes a gate electrode of said transistor.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/890,573 US7929926B2 (en) | 2007-08-07 | 2007-08-07 | Transmitting RF signals employing both digital and analog components with a common amplifier |
US11/890,573 | 2007-08-07 |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2638549A1 true CA2638549A1 (en) | 2009-02-07 |
CA2638549C CA2638549C (en) | 2012-10-16 |
Family
ID=40339658
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA2638549A Expired - Fee Related CA2638549C (en) | 2007-08-07 | 2008-08-07 | Transmitting rf signals employing both digital and analog components with a common amplifier |
Country Status (2)
Country | Link |
---|---|
US (1) | US7929926B2 (en) |
CA (1) | CA2638549C (en) |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3585530A (en) * | 1969-02-27 | 1971-06-15 | Rucker Co | Induction coupled amplitude modulation system |
US3800226A (en) * | 1971-01-07 | 1974-03-26 | Magnavox Co | Multiple frequency fm detector |
FR2670966B1 (en) * | 1990-12-21 | 1995-04-14 | Prana Rech Dev | WAVE PROPAGATION SIGNAL TRANSMISSION DEVICE AND APPLICATIONS THEREOF FOR AMPLIFICATION OF SUCH SIGNALS. |
US5315583A (en) * | 1991-04-11 | 1994-05-24 | Usa Digital Radio | Method and apparatus for digital audio broadcasting and reception |
US5420536A (en) * | 1993-03-16 | 1995-05-30 | Victoria University Of Technology | Linearized power amplifier |
US6144705A (en) * | 1996-08-22 | 2000-11-07 | Lucent Technologies Inc. | Technique for simultaneous communications of analog frequency-modulated and digitally modulated signals using precanceling scheme |
US6049703A (en) * | 1997-11-28 | 2000-04-11 | Motorola, Inc. | Amplifier circuit and method for increasing linearity of the amplifier circuit |
DE19944558C2 (en) * | 1999-09-17 | 2002-10-10 | Bosch Gmbh Robert | Method for sending radio signals and transmitter for sending a radio signal |
DE10112025A1 (en) * | 2001-03-06 | 2002-09-19 | Deutsche Telekom Ag | Method for reducing the out-of-band radiation in AM transmitters for digital transmission |
DE10127571A1 (en) * | 2001-05-30 | 2002-12-05 | Deutsche Telekom Ag | Method and arrangement for digital transmission with AM transmitters |
JP4230238B2 (en) * | 2003-02-06 | 2009-02-25 | パナソニック株式会社 | Transmitting apparatus and adjustment method thereof |
US7139534B2 (en) * | 2003-03-05 | 2006-11-21 | Matsushita Electric Industrial Co., Ltd. | Transmission circuit |
US7092683B2 (en) * | 2003-04-01 | 2006-08-15 | Matsushita Electric Industrial Co., Ltd. | Transmission circuit |
US7043213B2 (en) * | 2003-06-24 | 2006-05-09 | Northrop Grumman Corporation | Multi-mode amplifier system |
US7408401B1 (en) * | 2007-02-23 | 2008-08-05 | Roberts Retrovalve, Inc. | Vacuum tube replacement device, circuit and system |
US7391261B2 (en) * | 2005-12-16 | 2008-06-24 | Harris Corporation | Enhanced bandwidth envelope elimination and restoration |
US7593698B1 (en) * | 2006-07-11 | 2009-09-22 | Rf Micro Devices, Inc. | Large signal polar modulated power amplifier |
US20090011730A1 (en) * | 2007-07-05 | 2009-01-08 | Matsushita Electric Industrial Co., Ltd. | Methods and Apparatus for Controlling Power in a Polar Modulation Transmitter |
-
2007
- 2007-08-07 US US11/890,573 patent/US7929926B2/en not_active Expired - Fee Related
-
2008
- 2008-08-07 CA CA2638549A patent/CA2638549C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US7929926B2 (en) | 2011-04-19 |
US20090040958A1 (en) | 2009-02-12 |
CA2638549C (en) | 2012-10-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |
Effective date: 20220301 |
|
MKLA | Lapsed |
Effective date: 20200831 |