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We present a topology to provide tolerate quadrature signals in a MB-OFDM UWB frequency synthesizer. This frequency synthesizer is modified to replace a RC-CR network (RC-CR phase shifter) with a frequency division network (dual-mode divider), eliminating amplitude and phase errors of the RC-CR network. The proposed topology obtains superior suppression of image sideband of -15.5 dB when mismatches...
This paper presents a low-noise UWB CMOS mixer using switched biasing technique in 0.13-mum RF CMOS process. Design of the proposed mixer is based on the conventional Gilbert-type structure and utilizes switched biasing technique for a current source. As a flicker noise of the tail transistor is lowered by using switched biasing, the noise figure of the mixer output translated to baseband is improved...
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