
188 The Circuit Designer’s Companion
6.1.3 Induced switching noise
This phenomenon is more colloquially known as “ground bounce”. We are not talking
here about external noise signals, but about noise which is induced on the supply rails
by the switching action of each logic gate in the circuit.
As each gate changes state, a current pulse is taken from the supply pins because of
the different device currents required in each state, the external loading, the transient
caused by charging or discharging the node capacitance, and the conduction overlap in
the totem-pole output stage. All these effects are present in all logic families to some
extent, although ...