Complex coefficient transversal filter and complex frequency...

Details Complex coefficient transversal filter and complex frequency... Complex coefficient transversal filter and complex frequency...

2011-03-22

2011-03-22

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C375S229000, C375S322000, C375S326000

Reexamination Certificate

active

07912152

ABSTRACT:
A complex coefficient transversal filter using a SAW filter and a complex frequency converter using the complex coefficient transversal filter are provided, in which a first SAW filter receives a real signal as an input signal and generates a real component of a complex signal, and a second SAW filter receives the real signal as an input signal and generates an imaginary component of the complex signal. Accordingly, feed-through waves between the input and output stages can be cancelled, and a phase difference between real and imaginary signals can be maintained at 90° without a phase shift. In addition, when a low-IF frequency converter is implemented using the complex coefficient transversal filter, an image suppression characteristic is improved. When a zero-IF frequency converter is implemented using the complex coefficient transversal filter, an error vector magnitude (EVM) characteristic is improved.

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