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This paper presents the design and measurements of a differential K-band digitally-controlled oscillator (DCO) utilizing a tunable-dielectric resonator structure with an integrated divide-by-16 divider chain for use in an all-digital phase locked loop. The prototype differential oscillator exhibits 256 digitally-controlled states with the LSB corresponding to ∼700 kHz of frequency tuning. At a 1 MHz...
This paper presents the design of differential and phase-tunable quadrature K-band digitally-controlled oscillators (DCOs) utilizing a tunable-dielectric resonator structure, and preliminary measured results for the differential DCO. The prototype differential oscillator exhibits ∼1 GHz of tuning range with eight digitally controlled states. The quadrature oscillator design has 256-state (8-bit) frequency...
The prospects for and the state of the art of adaptable RF hardware are reviewed, focusing primarily on the traditional frequency planning bottleneck, the filtering stages. First, a case is made that even banded systems can be greatly impacted by a modest amount of tuning. This is done by showing the results of a traditional fixed system in an unlicensed band upgraded with a programmable front–end...
Growth rates of hatchery-reared cobia Rachycentron canadum cultured in submersible cages off Puerto Rico and the Bahamas were comprehensively studied and are presented, discussed and compared to those of other teleosts. Cobia grew to averages of 6.035kg (specific growth rate (SGR)=2.10%/day) in 363days at the Puerto Rico site (PR) and 3.545kg (SGR=2.04%/day) in 346days at the Bahamas site (BA). Growth...
A CMOS pulse generator capable of transmitting biphase wide band gated pulses is demonstrated. The pulse generator is an essential component of a prototype fully integrated UWB transmitter. The pulse generator can be used for impulse radio with BPSK or DBPSK modulations. The measured results show that the fabricated pulse generator design outputs pulses of ~6ns in width (equivalent to a first null...
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