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In this paper a low power, 4-bit, 50 MHz flash ADC in 130 nm technology is presented. Power consumption is the most important objective in this ADC. Two blocks, S/H and Latch, can be omitted in this ADC because of the comparator and encoder structures. Flash ADC has a peak SNDR of 23.47 dB at Nyquist frequency while the power consumption is 130 muW with a binary code encoder. This reduces to 115 muW...
In this paper the effect of antenna miniaturization in a UWB system is presented. Modified small-size printed tapered monopole antennas are designed in different scaling sizes. In order to evaluate the antennas performance and their functionality, the performance of three kinds of UWB systems, correlation detection, energy detection and transmitted reference UWB, is studied in the presence of each...
A modified small-size tapered monopole antenna is optimized for ultra wideband applications in the 3-10 GHz band. Its performance in time and frequency domain is verified in co-design with the transceiver. The antenna miniaturized with our developed real-coded compact genetic algorithm, RCCGA, where the antenna area has been reduced 48% comparing to previous work at 3.1 to 11.7 GHz bandwidth operation...
A modified small-size tapered monopole antenna is optimized for ultra wideband applications in co-design with the transceiver. Our optimization procedure aims at finding an antenna not only with low VSWR, but also miniaturizing the antenna at the same time. Our proposed optimization algorithm, real-coded compact genetic algorithm, RCCGA, has lowered the antenna area more than 48% compared to previous...
This paper presents a framework for behavioral modeling of transceiver front-ends including sampled-data systems. The operation of the building blocks is described as an interaction in a multi-dimensional space between phases and/or frequencies. This description gives insight in the origin of non-ideal signals suggesting ways to improve the performance of the system. Its main application is the architectural...
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