Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
  • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
  • G01R31/28—Testing of electronic circuits, e.g. by signal tracer
  • G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
  • G01R31/2822—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere of microwave or radiofrequency circuits
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
  • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
  • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
  • G01R27/04—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant in circuits having distributed constants, e.g. having very long conductors or involving high frequencies

Definitions

• the invention relates to an arrangement according to the preamble of the main claim.
• Adjustment of the load and the power to determine and monitor For this purpose, from DE 27 10 752 Al or DE 39 18 159 Al various analog arrangements according to the preamble of the main claim known. They have in common that for determining the operating characteristics on the connecting line between the power amplifier and antenna directional couplers are used and the calculation of the desired operating characteristics of the means obtained by the directional coupler analog forward or reverse voltage, respectively the leading or returning wave on the Connection line is proportional, carried out in an analogous manner by correspondingly complex analog circuits.
• complex analog measurement voltages obtained in this way are digitized according to the invention and from these digital values the various desired operating parameters such as complex forward or reverse voltage, complex forward and reverse power, the complex load impedance of the antenna, the Reflection factor or the ripple factor on the generally formed as a coaxial line connecting line between the output of the high-frequency power amplifier and the antenna can be calculated using well-known algorithms.
• the digitized measuring voltage proportional to the complex voltage on the line can be digitally demodulated, namely according to the demodulation mode which corresponds to the modulation mode in the generation of the high-frequency signal amplified by the power amplifier, thus for example an amplitude modulation. Frequency or phase modulation or any other higher-order modulation.
• the thus digitally demodulated useful signal at the output of the power amplifier can then for qualitative Judgment of the output signal fed back to the input of the radio system and made audible there, for example by means of a Mit Anlagenlaut Maschineners.
• a so-called side-tone signal can be generated, with the speech comfort, for example, a
• Shortwave telephony radio system can be monitored and improved. This possibility of feedback of one's own language is superior to the previously used direct feedback to the microphone amplifier on a monitoring loudspeaker, since all levels of the radio system including power amplifier are judged with. This possibility of demodulating the useful signal directly at the base of the antenna can just as well be used in CW operation or in the transmission of digital signals for monitoring in an advantageous manner.
• Another possibility is to determine from the digital values supplied to the computer, which correspond to the complex supply voltage, the distortion of the output stage which arises due to non-linearity.
• the useful signal supplied to the power amplifier can be pre-distorted in the opposite direction to the distortion before the amplification in a known manner, so that thus the distortions in the power amplifier are compensated.
• This determination of the distortion in the output stage can also be constantly monitored during operation, so that even with a change in the load, for example, turning on another antenna or a frequency change, the system is automatically linearized via a corresponding change in the predistortion.
• Fig. 1 shows the block diagram of a shortwave power amplifier with the development of the invention.
• FIG. 1 shows the block diagram of a shortwave power output stage with an RF power amplifier 1 to which the useful signal to be amplified from a control and modulation device 2 is supplied.
• the output of the power amplifier 1 feeds via a coaxial connection line 3, an antenna 4.
• the outer conductor is interrupted and via a directly on the inner conductor of the coaxial line 3 connected capacitive voltage divider 5 Buschbeck is one of the complex voltage U proportional measurement voltage U u , which is digitized in an A / D converter 6 and fed to a computer 7.
• a measurement voltage Ui corresponding to the complex current I on the line is obtained at a resistor, the analog measurement value -Ui is determined via an A / D converter 9 and the measured value + Ui is determined via an A.
• / D converter 10 is supplied to the computer 7. After the two obtained voltage values + Ui and -Ui are perpendicular to each other, possibly only a single A / D converter 9 or 10 can be used and the corresponding other value can then be calculated directly in the computer 7, so that an A / D Converter is saved.
• the computer 7 is for example an FPGA calculator.
• the complex forward voltage according to relationship (1) or the complex return voltage can be calculated according to relationship (2) or according to relationship (3) the complex supply power or after (4) the return power.
• Another possibility according to relationship (5) is to calculate the complex load impedance Z from these voltages.
• the power consumption, intermodulation and / or the harmonic distance can then be improved, for example, by adaptively turning different length 50 ohms line pieces between power amplifier 1 and antenna 4, as the complex adjustment can be optimized by the switched-line pieces so that Power amplifier is operated in an optimal adjustment range.
• a low-pass character can be generated and worked in a capacitive range, so that the harmonic separation is improved.
• the gain can be optimized so that the power amplifier can be better adapted to its scattering parameters. In this way, the efficiency of the power amplifier can thus be optimized by calculating the complex load impedance.
• the invention is not limited to the embodiment described. All described or drawn elements can be combined with each other. Also, a digital demodulation of the useful signal, as described above, possible, as well as the determination of the distortion of the amplifier and the resulting possible linearization by appropriate predistortion of the input signal.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Amplifiers (AREA)

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Publications (1)

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ID=38623975

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Citations (4)

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• 2006
  • 2006-07-05 DE DE102006031046A patent/DE102006031046A1/de not_active Withdrawn
• 2007
  • 2007-06-01 WO PCT/EP2007/004887 patent/WO2008003376A1/de active Application Filing
  • 2007-06-01 EP EP07725767A patent/EP2035839A1/de not_active Ceased
  • 2007-06-01 AU AU2007271484A patent/AU2007271484B2/en active Active
  • 2007-06-01 US US12/307,513 patent/US8219337B2/en active Active
  • 2007-06-01 CN CN2007800216818A patent/CN101467053B/zh active Active
• 2008
  • 2008-12-11 NO NO20085177A patent/NO342068B1/no unknown
  • 2008-12-28 IL IL196238A patent/IL196238A0/en active IP Right Grant

Patent Citations (4)

Non-Patent Citations (1)

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