  The interference gating is a novel method for robust time-resolved electron
holographic measurements by directly switching the interference. Here, a new
arrangement is presented in which a biprism in the condenser aperture as a fast
electric phase shifter is used to control the interference pattern.
High-frequency stimulation of the electric phase shifter in the gigahertz range
are performed and observed via electron holography, proving the feasibility of
interference gating in the upper picosecond range. Despite the bandwidth
limitation of 180~MHz of the current signal generator, a time resolution of 100
nanoseconds is achieved through forward correction of the control signal. With
this time resolution, it is already possible to measure the transient response
of the biasing holder system. Our method paves the way towards a closer look on
fast dynamic processes with high temporal and spatial resolution.
