A radio frequency power supply for collision reaction cell based on dds

Abstract

A DDS-based radio frequency power supply for a collision reaction cell belongs to the field of radio frequency power supplies for test and analysis instruments. Including control circuit, DC power supply, DDS signal generation circuit, drive circuit, amplifier circuit, LC resonant circuit. The radio frequency power supply of the collision reaction cell based on DDS is controlled by the control circuit to generate a signal of a specific frequency by the DDS signal generation circuit. After the signal passes through the drive circuit and the amplifier circuit, it is coupled to the LC resonant circuit through a coil. The circuit parameters of the LC resonant circuit are given by The frequency of the DDS signal and the amplitude of the final output signal determine. Finally, two radio frequency signals with equal amplitude and 180 degree phase difference are output. The frequency can range from several hundred kHz to several MHz, the frequency resolution can reach 1Hz, and the amplitude can range from zero to thousands of volts. This RF power supply is suitable for multipole collision reaction cells of mass spectrometers or other multipole-based ion shaping devices.

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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