A baseband shaping device includes a plurality of coefficient memories,
each memory having an input address bus, a multiplexor input and a
coefficient value output. The device further includes a plurality shift
registers, each having an input coupled to a respective one of the
coefficient value outputs, a digital to analog clock input and an output.
The device further includes a plurality of negative value circuits, each
circuit having an input coupled to a respective one of the first shift
register outputs and an output, a plurality of multiplexors, each having
a first input coupled to a respective one of the first shift register
outputs and a second input coupled to a respective one of the output of
the plurality of negative value circuits. The device further includes a
plurality of second shift registers, and an adder having a plurality of
inputs coupled to the plurality of second shift registers.