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A direct-conversion mixer with low flicker noise and low dc offset is presented for WLAN applications. The design consists of a folded-type active mixer with a resonant inductor in cascade with a source-driven passive mixer, operating at half the conventional LO frequency. Because of this unique topology, neither direct nor indirect flicker noise of the active mixer appears at the mixer output. Moreover,...
In this paper, the authors propose an on-die power supply noise measurement system for power integrity characterization using one bias supply. The measurement system is operated by the bias voltage provided to logical blocks such as Core and IO block in a microprocessor since another supply power rail for the measurement system can create a coupling to the existed power rails. The power supply noise...
Power factor correction (PFC) converters are commonly used at the first stage in single-phase switch-mode AC/DC power converters to improve the input current waveform distortion and achieve high efficiency in energy conversion. The operating condition of MOSFET in a PFC converter changes dynamically and periodically. This paper studies the operating condition and output load dependency of spectrum...
The next generation of wireless communication is a ubiquitous radio system concept, providing wireless access from short-range to wide-area, with one single reconfigurable and adaptive system for all envisaged radio environments. This paper presents the design approach of RCO (reconfigurable concurrent oscillator) that simultaneously generates two or more signals of different frequencies that eliminate...
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