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This paper presents a fast switching frequency synthesizer for a Mode-1 MB-OFDM UWB system. The proposed architecture with a new frequency plan is designed to simplify the synthesizer implementation for optimizing the system power consumption and sideband rejection ratio. This frequency generator consists of a single phase-lock-loop (PLL), a 12-phase coupled ring oscillator, tri-mode divider-by-2...
An integrated 6.2-9.5GHz CMOS UWB receiver for WiMedia MB-OFDM is proposed. The fully differential receiver consists of a wideband LNA and a down conversion mixer with high and low gain mode. A low-pass filter and a programmable gain amplifier are also included. The chip was fabricated in TSMC 0.13-μm RF CMOS process. Measurement results show that the receiver achieves voltage gain from 21dB to 63dB...
This paper presents a current-mode 6~9GHz RF transmitter for OFDM-UWB system applications. By a current-mode low pass filter with variable gain between the digital-to-analog converter and the up-conversion mixer, this transmitter exceeds the traditional voltage-mode counterpart in terms of high linearity (+3.5-dBm output 1-dB compression point, +12.5-dBm output third intercept point) and low spurious...
An RF Transmitter front-end implemented in 0.18 μm CMOS for WiMedia MB-OFDM UWB is presented in the paper, which consists of a V-I converter, an up modulator, a Differential to Single (D2S) converter, a PA and the divided by 2 divider for the LO carrier generation. The post simulation shows the maximum transmitter linear output power level of -2 dBm (3.1-4.8 GHz band) with 6 dB power control range,...
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