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In this paper, a frequency tunable differential input differential output low noise amplifier (LNA), used for 3-5 GHz OFDM applications, is proposed and analyzed. The LNA has a wideband input matching and a tunable output matching. The digital controlled capacitor arrays in the output matching networks allow the LNA to be switched smoothly in the frequency range of 3 to 5 GHz with output return loss...
A function generator circuit using positive type second-generation current-controlled current conveyors [CCCII+]-based voltage mode non inverting band-pass filter (BPF) as a starting building block is proposed. A direct feedback path from the output to the input of the BPF is provided to obtain a sinusoidal oscillator. Then, [CCCII+(2)] of the sinusoidal oscillator is replaced by multioutput current-controlled...
A CMOS phase-locked loop (PLL) which synthesizes frequencies between 474 and 858 MHz in steps of 1 MHz and settles in less than 180 ??s is presented. This PLL can be implemented as a sub-circuit for a frequency synthesizer which serves for UHF Digital-TV receiver. To realize fast loop settling, integer-N architecture that work with 1 MHz reference frequency is implemented and a novel adaptive frequency...
RF CMOS circuit design techniques for ultrawideband (UWD) applications are presented. In the RF amplifier design, a combination of a constant-k filter and a resistive shunt feedback circuit is suggested for wide-band operation. We report that a circuit integrated by using 0.13-mum CMOS process technology has achieved an operation bandwidth from 2 to 5.8 GHz with a peak gain of 9 dB. In a ring VCO,...
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