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A multi-standard transceiver requires a wide-band radio frequency front-end in order to process RF signals of any frequency included by all the standards concerned. A noise cancellation technology is utilized in the low noise amplifier (LNA) to cancel the noise introduced by the source resistance matching segment. An active balun is embedded in the input stage of the mixer, which connect the single-end...
This paper presents a robust RF front-end for 3.1-4.8-GHz direct-conversion Ultra-wideband (UWB) applications such as the MB-OFDM UWB. The circuits contain a gain controllable low-noise amplifier (LNA) with resistive feedback, a merged quadrature mixer with static current injection, and local oscillator (LO) buffers. Post-layout simulations show that the fully differential front-end achieves a maximum...
A differential low noise amplifier applied in ASK receiver is designed and fabricated in UMC 0.18 ??m CMOS process. The amplifier employs a differential cascode structure with source degeneration stage for single input and differential output, and avoids using balun when connected to mixer. This low noise amplifier has a measured forward gain of 18.2 dB and a noise figure of only 1.65 dB, thus can...
This paper presents a technique using current-mode approach for a CMOS differential low noise amplifier design, simulated with a TSMC 0.18 ??m RF CMOS process, working at 1.2 V supply. A comparison with conventional voltage-mode LNA shows that this LNA has advantages of low voltage, low power consumption and simple structure. Simulation results demonstrate that at 2.4 GHz, the noise figure is only...
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