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The energy transmitted per bit limits the radio coverage. In impulse radio the UWB pulses used carry a very little energy since they are extremely short. As a consequence the radio coverage is unacceptable short. A solution to increase the energy per bit is the enlargement of the duration of UWB carrier pulse, however, this solution cannot be used because the correlation of received pulse envelope...
An empirical design optimization approach is explored for A/D-converter area efficiency. The die area consumption of commonly used ADC architectures is surveyed. Based on trends observed in a large set of empirical data, the area normalized to number of effective quantization steps is proposed as a generic measure of area efficiency. It is seen that state-of-the-art absolute area has a strong correlation...
Testing an RF device in Production is expensive and technically difficult. At Wafer Test level, the RF probing technologies hardly fulfil the industrial test requirements in terms of accuracy, reliability and cost. At Package test level testing the RF parameters requires expensive RF equipments (RF automated test equipments (ATE)) and for complex RF transceivers, which address multi-modes (RF multi-paths...
In CDMA communications with radio waves, binary spreading sequences are used as bipolar codes taking +1 or −1. On the other hand, in on-off keying modulation such as optical communications, spreading sequences are used as unipolar codes taking 1 or 0. In this paper, performances of asynchronous SIK (sequence inversion keyed) DS/CDMA systems using unipolar codes are evaluated and compared with normal...
The paper presents new hybrid procedure for analog circuit fault clustering with the use of simulated annealing and self-organizing neural network. Main goal of the method is to find best PWL excitation under maximum diagnosability of the circuit. Optimization is done with simulated annealing. For each node in the optimization the goal function ranks how well a neural network performs in the classification...
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