CA2593721A1 - Alternating digital rf modulation - Google Patents
Alternating digital rf modulation Download PDFInfo
- Publication number
- CA2593721A1 CA2593721A1 CA002593721A CA2593721A CA2593721A1 CA 2593721 A1 CA2593721 A1 CA 2593721A1 CA 002593721 A CA002593721 A CA 002593721A CA 2593721 A CA2593721 A CA 2593721A CA 2593721 A1 CA2593721 A1 CA 2593721A1
- Authority
- CA
- Canada
- Prior art keywords
- modules
- turn
- modulator
- turned
- set forth
- 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
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C1/00—Amplitude modulation
- H03C1/36—Amplitude modulation by means of semiconductor device having at least three electrodes
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High frequency amplifiers, e.g. radio frequency amplifiers
Abstract
A pulse step modulator employs a plurality of series connected unit step power amplifier modules. Each module is turned on by a turn-on signal t o provide a unit step voltage of a given value. An output circuit is connected to the modules for providing an output voltage to a load and wherein the output voltage is a multiple of the unit step voltages in dependence upon the number of modules that are turned on. The modules are sequentially turned on in a given order and are turned off in the reverse order. An encoder provides turn-on signals with each turn-on signal being applied to a selected one of the modules. The number of turn-on signal s provided varies as a function of the magnitude of a time varying input signa l. A controller alternately turns enables or disables (in a swapping manner) one of a pair of associated modules as the magnitude of the input signal increases and decreases.
Claims (8)
1. A pulse step modulator comprising a plurality of series connected unit step power amplifier modules with each said module being turned on by a turn-on signal to provide a unit step voltage of a given value;
an output circuit connected to the modules for providing an output voltage to a load and wherein said output voltage is a multiple of said unit step voltages in dependence upon the number of modules that are turned on;
said modules being sequentially turned on in a given order and are turned off in a reverse order as the input signal increases and decreases in value;
an encoder that provides turn-on signals with each turn-on signal being applied to a selected one of the modules with the number of turn-on signals provided varying as a function of the magnitude of a time varying input signal; and a controller that alternately enables and disables (in a swapping manner) one of a pair of associated modules as the magnitude of the input signal increases and decreases.
an output circuit connected to the modules for providing an output voltage to a load and wherein said output voltage is a multiple of said unit step voltages in dependence upon the number of modules that are turned on;
said modules being sequentially turned on in a given order and are turned off in a reverse order as the input signal increases and decreases in value;
an encoder that provides turn-on signals with each turn-on signal being applied to a selected one of the modules with the number of turn-on signals provided varying as a function of the magnitude of a time varying input signal; and a controller that alternately enables and disables (in a swapping manner) one of a pair of associated modules as the magnitude of the input signal increases and decreases.
2. A modulator as set forth in claim 1, wherein said pluralities of modules includes N modules where N is an even number.
3. A modulator as set forth in claim 1, wherein each said turn on signal turns on an enabled one of a said pair of associated modules.
4. A modulator as set forth in claim 3, wherein said pluralities of modules includes N modules where N is an even number.
5. A modulator as set forth in claim 1, wherein said plurality of modules includes N modules divided into pairs of associated modules.
6. A modulator as set forth in claim 5, wherein said pluralities of modules includes N modules where N is an even number.
7. A modulator as set forth in claim 3 wherein said N modules includes modules 1 to N respectively associated with incrementally increasing magnitudes of said input signal.
8. A modulator as set forth in claim 7, wherein N is an even number.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/477,197 | 2006-06-28 | ||
| US11/477,197 US7719377B2 (en) | 2006-06-28 | 2006-06-28 | Alternating digital RF modulation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2593721A1 true CA2593721A1 (en) | 2007-12-28 |
| CA2593721C CA2593721C (en) | 2010-09-28 |
Family
ID=38834961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2593721A Active CA2593721C (en) | 2006-06-28 | 2007-06-27 | Alternating digital rf modulation |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US7719377B2 (en) |
| CA (1) | CA2593721C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7903041B2 (en) * | 2008-05-01 | 2011-03-08 | Lockheed Martin Corporation | Magnetic antenna apparatus and method for generating a magnetic field |
| JP2014082749A (en) * | 2012-09-28 | 2014-05-08 | Fordan Kk | Composite transmitter having composite power amplifier |
| TW202213940A (en) | 2020-07-31 | 2022-04-01 | 麻薩諸塞科學研究所 | Radio-frequency power generator and control method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2064901B (en) * | 1979-11-30 | 1984-11-07 | Harris Corp | Digital high power amplifier |
| US4580111A (en) * | 1981-12-24 | 1986-04-01 | Harris Corporation | Amplitude modulation using digitally selected carrier amplifiers |
| EP0124765B1 (en) * | 1983-05-10 | 1987-09-02 | BBC Brown Boveri AG | Digital power switching amplifier |
| US4947455A (en) * | 1988-11-09 | 1990-08-07 | Harris Corporation | RF power supply for supplying a regulated power amplified unmodulated drive signal to an RF modulator |
| US6970051B2 (en) * | 2003-12-08 | 2005-11-29 | Harris Corporation | Pulse width modulator circuit having negative bias |
-
2006
- 2006-06-28 US US11/477,197 patent/US7719377B2/en active Active
-
2007
- 2007-06-27 CA CA2593721A patent/CA2593721C/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CA2593721C (en) | 2010-09-28 |
| US20080002764A1 (en) | 2008-01-03 |
| US7719377B2 (en) | 2010-05-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |