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This paper presents a LC-tank voltage-controlled oscillator (VCO) with a transformer-based tuning topology implemented in 0.18-mum CMOS process. The proposed topology uses an integrated transformer to provide voltage-controlled inductance value. The measured phase noise is mu122.85 dBc at 1-MHz offset from a 6.45-GHz carrier and its tuning range is 600MHz from 6.11 to 6.71 GHz
This paper describes a CMOS limiting amplifier consisting of five stage gain cells and a buffer for optical communication. In order to mitigate the bandwidth limit of the amplifier, a bandwidth-extension technique with neutralized capacitors is adopted. Fabricated in a commercial 0.18-mum CMOS process, the limiting amplifier provides gain of 45 dB and 3-dB bandwidth of 3.125 GHz, and consumes power...
In this paper, a burst-mode clock and data recovery (CDR) circuit using a 1/4-rate clock technique is realized for optical communication system. The CDR circuit contains a phase detector and a muxed-oscillator to control the phase of the clocks. In-lock operation is accomplished on the first data transition, and after the first data the clocks are in phase for all data until the data transition is...
A fractional-N frequency synthesizer for IEEE 802.11a/b/g standard with the design focused on voltage controlled oscillator (VCO) is proposed in this paper. Unlike the traditional approach of tuning VCO oscillation frequencies by capacitive varactors, the proposed VCO with a voltage-controlled inductor, which is made by an integrated transformer technology, is adopted. A digital delta-sigma modulator...
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