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A 50-Mb/s quadrature phase-shift keying (QPSK)/offset quadrature phase-shift keying (O-QPSK) transmitter suitable for biomedical high-quality imaging application is presented. Centered at 915 MHz, the phase modulation is achieved by directly modifying the self-resonant frequency of an LC voltage-controlled oscillator through capacitor bank switching. By eliminating many unnecessary building blocks...
In this paper, a fully integrated monocycle pulse based UWB transmitter is presented. Fabricated in a 0.18-??m CMOS process, a low-power all-digital UWB pulse generator and modulator are proposed. The modulated pulse is further shaped by a driver amplifier and a band-notched UWB antenna. The transmitted pulses are binary phase modulated and meet the FCC UWB low frequency band (3.1-4.5GHz) spectral...
This paper presents a single-chip transmitter for ultra wide band (UWB) wireless communication system based on impulse radio technology. It is implemented in a CMOS 0.18-mum technology with 3.3 V voltage supply. The transmitter can generate UWB pulse with 2 GHz bandwidth with 20-dB side-lobe rejection. The differential output swing is 7.2 V under 100 Omega loads. The average current consumption of...
In this paper, a fully integrated CMOS UWB transmitter is presented. The transmitter consists of a band-notched UWB antenna and a transmitter IC which integrates a pulse generator, a gating signal generator and driver amplifiers. The drive amplifier employs a 2-stage amplifier-a class-E amplifier and a class-A amplifier with switch control, to significantly reduce power consumption. Fabricated using...
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