On-line nuclear magnetic resonance broadband radio frequency signal power amplifier circuit

Abstract

Embodiments of the invention provide an online nuclear magnetic resonance broadband radio frequency signal power amplifying circuit. The circuit comprises a first level amplifying circuit, a second level amplifying circuit, a third level amplifying circuit, a first coupling transformer, a second coupling transformer, a third coupling transformer, a biasing circuit and a control circuit; the first level amplifying circuit is connected with the second level amplifying circuit through the first coupling transformer; the second coupling transformer is connected with the third coupling transformer through the second coupling transformer; the third level amplifying circuit is connected with the output end of the power amplifying circuit through the third coupling transformer; and the biasing circuit is respectively connected with the control circuit, the second level amplifying circuit and the third level amplifying circuit. According to the online nuclear magnetic resonance broadband radio frequency signal power amplifying circuit provided by the embodiments of the invention, the control circuit controls the bias voltage of a radio frequency MOSFET through the biasing circuit, in order to control the opening or closing of MOSFET, preventing a transmission signal in the power amplifying circuit from affecting the reception of a prepositive amplifying circuit on an echo signal and improve the detection precision of the echo signal.

Description

technical field [0001] Embodiments of the present invention relate to the field of oil detection, and in particular to an online nuclear magnetic resonance broadband radio frequency signal power amplifying circuit. Background technique [0002] The nuclear magnetic resonance spectrometer is composed of a power amplifier circuit, a preamplifier circuit, a signal acquisition and processing circuit and a sensor detection area. When using NMR spectrometer for NMR measurement, the test sample is placed in the detection area of ​​the sensor, and the power amplifier circuit inputs the amplified pulse signal into the detection area of ​​the sensor to excite the test sample in the detection area of ​​the sensor to generate a sample signal. Sample signals were analyzed by data inversion. [0003] The power amplifier circuit is an important part of the nuclear magnetic resonance spectrometer, and it is also the main energy transmitting unit in the process of nuclear magnetic resonance...

AI Technical Summary

Problems solved by technology

[0004] Since the external circuit continues to provide bias voltage for the RF MOSFET, the RF MOSFET is always kept in the on state, and the power amplifier circuit continues to send the transmission signal. Since the amplitude of the echo signal received by the preamplifier circuit is small, the continuous transmission signal affects the echo signal. The reception of the wave signal leads to inaccurate detection of the echo signal

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