Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2004-04-21
2009-11-03
Ha, Dac V (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
C375S285000, C455S118000
Reexamination Certificate
active
07613249
ABSTRACT:
Apparatus, systems, and methods implementing techniques for reducing spurious components are described. According to one aspect, a wideband polyphase filter filters an input signal that has an associated first frequency. The wideband polyphase filter has poles corresponding to a first filter frequency and a second filter frequency, where the two filter frequencies are different. According to another aspect, a mixer mixes the filtered signal with a local-oscillator signal at a second frequency to produce an upconverted signal, where the second frequency is substantially an integer multiple of the first frequency.
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Ha Dac V
Marvell International Ltd.
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