DDS-based collision reaction tank radio-frequency power supply

Abstract

The invention discloses a DDS-based collision reaction tank radio-frequency power supply, and belongs to the field of test analysis instrument radio-frequency power supplies. The DDS-based collision reaction tank radio-frequency power supply comprises a control circuit, a direct-current power supply, a DDS signal generating circuit, a drive circuit, an amplifying circuit and an LC resonance circuit. According to the DDS-based collision reaction tank radio-frequency power supply, the control circuit is used for controlling the DDS signal generating circuit to generate a signal with specific frequency, after the signal passes through the drive circuit and the amplifying circuit, the signal is coupled to the LC resonance circuit through a coil, and the circuit parameters of the LC resonance circuit are determined by the frequency of the DDS signal and the amplitude of the final output signal. Finally, two radio-frequency signals with equal amplitude and 180-degree phase difference are output, the frequency can be hundreds of kHz to several MHz, the frequency resolution can reach 1 Hz, and the amplitude can be zero to thousands of volts. The radio-frequency power supply is applicable to multi-pole collision reaction tanks of mass spectrometers or other ion forming devices based on multiple poles.

Description

technical field [0001] The invention belongs to the field of radio frequency power supplies for test and analysis instruments, in particular to a DDS-based collision reaction cell radio frequency power supply. This RF power supply is suitable for multipole collision reaction cells of mass spectrometers or other multipole-based ion shaping devices. Background technique [0002] At present, mass spectrometers have been widely used in the field of rapid detection, and can detect almost all elements in the periodic table. The application of hexapole collision reaction cell, octopole collision reaction cell and other multi-pole collision reaction cell technology makes it occupy a unique position in the field of isotope testing. [0003] In the multi-pole collision reaction cell of the mass spectrometer, the plasma and the collision gas collide violently. After the collision, the kinetic energy distribution of the ions is reduced from several eV to about 0.1eV, which will greatly...

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of radio frequency power supply of the collision reaction cell based on DDS, solve the problem in the above-mentioned prior art that due to the constant change of the multipole load in the collision reaction cell, relying solely on self-resonance to generate radio frequency signals, it is difficult to ensure The consistency of the oscillation frequency and other issues; it can well ensure the consistency of the frequency of the radio frequency power supply signal of the collision reaction cell

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