  Crosstalk characteristics such as pulse amplitude and shape are studied with
a simple PSpice model of the capacitive couplings within an MPGD. The crosstalk
pulse shape can be understood as due to a CR-differentiator. Crosstalk can
occur simultaneously through more than one capacitive coupling path. The
crosstalk signals on these paths add differently if the signal is induced via a
current source as in normal detector operation or via a voltage source as is
often done in benchtop tests with an external voltage pulse generator. A few
means for reducing the crosstalk are investigated with the model. It shows that
a low-impedance AC path from the amplification electrode that faces the readout
structure to ground is important for minimizing crosstalk. This implies a need
for a sufficiently large capacitance of that amplification electrode to ground.
This result has consequences for how much such an amplification electrode can
be segmented without incurring crosstalk.
