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This paper presents the design and integration of a fully-integrated dual-conversion zero-IF2 CMOS transceiver for 9-band MB-OFDM UWB systems from 3.1 GHz to 8.0 GHz. The transceiver integrates all building blocks including a variable-gain wideband LNA, a single combined mixer for both RF down-conversion in RX and up-conversion in TX, a fast-settling frequency synthesizer, and IQ ADCs and DACs. Fabricated...
In this paper we discuss a CMOS based wideband VGA configuration designed in 0.18 mum UMC process providing a gain of 21 dB and bandwidth of 360 MHz with control voltage range of 1.0 V to 1.6 V. The results of the design were verified through layout. Further, the design was modified to incorporate it in an AGC for Software radio applications. The design process resulted in two ultra wideband VGA designs...
The frequency selectivity of wireless communication channels can be characterized by the delay spread Ds of the channel impulse response. If the delay spread is small compared to the bandwidth W of the input signal, that is, DsW ?? 1, the channel appears to be flat fading. For DsW ?? 1, the channel appears to be frequency selective, which is usually the case for wideband signals. In the first case,...
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