Circuit and method for generating a current pulse in a waveguide

A waveguide driving circuit for generating a current pulse in a waveguide, comprising:

• a voltage source for providing a direct voltage;
• a choke the first terminal of which is in direct-current coupling to a first terminal of the voltage source;
• a first switch the first terminal of which is coupled to a second terminal of the choke and the second terminal of which is coupled to a second terminal of the voltage source;
• the waveguide the first terminal of which at a first waveguide end is coupled to the first terminal of the first switch and the second terminal of which at the first waveguide end is coupled to the second terminal of the voltage source;
• and
• a controller implemented to open and close the first switch to generate a current pulse at the terminals of the waveguide at the first waveguide end,
• wherein the waveguide driving circuit is implemented such that at a switching time when the first switch is brought from a conducting state to a high-impedance state, a current impressed on the waveguide equals a current flowing through the choke directly before switching.