An area-efficient CMOS impulse radio ultra-wideband (IR-UWB) transmitter capable of generating variable orders of Gaussian pulses is presented. The core of the pulse generator is constructed using the cascade connection of RC differentiator networks separated by tunable amplifiers. Tuning the bias current of the amplifier using a voltage-controlled current-source allows for generation of varying orders of Gaussian pulses, which in turn allows for controlling the power and spectral mask of transmitted signals. Fabricated in a TSMC 90 nm digital CMOS process, the measurement shows that the fully integrated transmitter can generate fifthto sixth-order Gaussian pulses. The core transmitter consumes 10.0-12.0 mW at 200 MHz pulse repeating frequency and occupies a chip area of 0.008 mm 2 only.
A 3.1-10.6GHz ultra-wideband low noise-amplifier (UWB LNA) using standard 0.18um CMOS technology which is applicable in telecommunication has been reported. A two-stage, common-gate in cascade with cascode, UWB LNA has been proposed to achieve more than 10dB input and output return loss, maximum gain of 26dB, and NF of 2.9dB over the full frequency band. The proposed LNA consumes 10mW from 1.8V supply. The designed LNA has an excellent high gain in comparison with previous works.
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