Novel material VU waveband broadband power amplifier for dielectric logging instrument

Abstract

The invention discloses a novel material VU waveband broadband power amplifier for a dielectric logging instrument. The power amplifier comprises a gallium nitride GaN power amplifier tube core, the drain electrode of the power amplifier tube core is electrically connected with a drain electrode driver; the drain electrode driver is electrically connected with the energy storage capacitor throughthe high-power MOS tube, the grid electrode of the power amplifier tube core is electrically connected with a buffer in the grid electrode driver, and the grid electrode driver further comprises an encoder electrically connected with the buffer and a band gap reference electrically connected with the encoder. The power amplifier has the advantages that gallium nitride (GaN) serving as a novel semiconductor material is used as the tube core of the power amplifier, the forbidden band width is large, the breakdown voltage is high, and the anti-radiation capacity is high.

Description

Technical field [0001] The invention belongs to the technical field of petroleum logging engineering, and particularly relates to a new material VU-band broadband power amplifier for dielectric logging tools in this field. Background technique [0002] Low-resistivity oil layers and high-resistivity water layers are not uncommon in secondary and tertiary mining in the petroleum industry. Using resistivity method to distinguish oil-water layers often fails, and the relative permittivity of water (about 80) and the relative permittivity of oil (2~4) are very different; therefore, the measurement of permittivity can be easier than other methods Distinguish oil, gas, and water layers. In recent years, more and more attention has been paid to the measurement of the dielectric constant of the formation near the borehole. The measurement of the formation permittivity requires the use of a dielectric logging tool. The dielectric logging tool uses the difference between the relative amp...

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Problems solved by technology

[0003] The power amplifier used in the transmitter of the dielectric logging tool in the early stage has a narrow working frequency band and a single frequency, and cannot obtain richer formation information by using the broadband electromagnetic wave dispersion effect; Higher temperature underground working environment; at the same time, the early transmitter power amplifier has low working efficiency, resulting in large heat loss of the transmitter and high power consumption of the whole instrument. The transmitter power amplifier cannot work stably at high power for a long time in the underground high temperature environment , must work in time to reduce the average power consumption

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