  We consider an exponentially stable closed loop interconnection of a
continuous linear plant and a continuous linear controller, and we study the
problem of interconnecting the plant output to the controller input through a
digital channel. We propose a family of "transmission-lazy" sensors whose goal
is to transmit the measured plant output information as little as possible
while preserving closed-loop stability. In particular, we propose two
transmission policies, providing conditions on the transmission parameters.
These guarantee global asymptotic stability when the plant state is available
or when an estimate of the state is available (provided by a classical
continuous linear observer). Moreover, under a specific condition, they
guarantee global exponential stability
