Patent ID: 9620349
Date: 2017-04-11
CPC Classifications: H01J

Claim:
1. A Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry device, the device comprising: an ICR cell having at least one electrode; a magnet or a superconducting magnet, said magnet structured for generating a magnetic field, which keeps ions on a cyclotron orbit in a direction of a z axis in an axial direction with respect to said ICR cell; and a transmission and receiving device having a duplexer, a transmitter and a preamplifier, said duplexer comprising one or more semiconductor components structured for use in mass spectrometry, wherein said transmitter generates a transmitter voltage which is transported during an ion excitation phase via a transmitter path in said duplexer to said at least one electrode of said ICR cell, said duplexer being structured to protect said preamplifier from overvoltage using antiparallel diodes and a serial impedance for current limiting, wherein said transmission and receiving device is also structured to transmit an ion received signal in response to a voltage of said at least one electrode following from an influenced charge and via said receive path of said duplexer to said preamplifier during an ion detection phase, wherein said transmission and receiving device comprises at least one active serial switch having two switchable states, with each switching state having a different series impedance, wherein said active serial switch is controlled by a control electronics unit inserted in said receive path as part of said duplexer to transmit, in said ion detection phase, the received signal via a low series impedance as lossless as possible to said preamplifier and to protect said preamplifier in the excitation phase via a high series impedance and said antiparallel diodes.