A fully integrated noncoherent IR-UWB CMOS receiver is implemented using 0.18 lm CMOS technology. To remove the bulky and lossy external balun, the receiver contains single to differential circuit embedded in low-noise amplifier (LNA) stages. The LNA stage also includes a tunable LC load for band selection. The measured results show that the sensitivity is À78.9 dBm at 1 Mbps in condition of BER of 10 -3 . The chip size is 2.3 mm  1.3 mm including pads. The consumed current is 20 mA at 1.8 V supply.
A 3-5-GHz CMOS ultrawideband (UWB) transmitter is implemented using 0.18-lm CMOS technology. The transmitter is composed of switched LC VCO and digital pulse generator (DPG). The proposed DPG provides the short and tunable VCO switching pulse. The measured UWB center frequency range is 3.5-4.4 GHz with the trimmable capacitor bank of LC VCO, and the pulse duration is tunable from 1 to 3 ns by virtue of DPG. The measured energy efficiency per pulse is 5.8% and the power consumption is 0.22 mW at 10 Mbps without the buffer amplifier. The chip core size is 350 Â 1000 lm 2 .ABSTRACT: This letter presents a new differential active inductor voltage-controlled oscillator (VCO), which uses the complementary cross-coupled pairs to generate differential negative resistance. The active inductor is formed with complementary CMOS. The proposed CMOS low-phase noise VCO has been implemented with the United Manufacture Corp. (UMC) 90nm CMOS technology and the die area is 0.575 Â 0.61 mm 2 . At the supply voltage of 0.9 V, the total power consumption is 4.5 mW. The free-running frequency of VCO is tunable from 1.22 to 1.86 GHz as the tuning voltage is varied from 0.0 to 0.9 V. The measured phase noise at 1MHz offset is À111.56 dBc/Hz at the oscillation frequency of 1.22 GHz and the figure of merit of the proposed VCO is about À166.75 dBc/Hz.
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