Patent ID: 7912152

Claim:
A complex coefficient transversal filter comprising: a first surface acoustic wave (SAW) filter for receiving a real signal as an input signal and generating a real component of a complex signal; and a second SAW filter for receiving the real signal as an input signal and generating an imaginary component of the complex signal, wherein the first and second SAW filters drive at least one of an input stage for the real signal and an output stage for the complex signal in a balance mode to prevent phase shifting of the real signal and the imaginary signal, wherein the first and second SAW filters each includes two input-stage transducers which are disposed in line symmetry with respect to an input signal transmission direction and one output-stage transducer which is disposed in a direction perpendicular to an output signal transmission direction and two output-stage transducers which are disposed in parallel to each other in a direction perpendicular to the output signal transmission direction, and wherein the input-stage transducers are driven in a single mode and the output-stage transducer is driven in the balance mode.