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A Gaussian pulse generator is proposed for UWB impulse radio systems. The generator is probed in two modulation schemes (PP and BPSK) transmitting at 400 Mbps. The proposed modulators are coupled to a 50 ohms load. The Gaussian pulse generator has been designed and simulated in Mentor Graphics for a TSMC 0.18 um MMRF CMOS process with a power supply of +/-0.9 v.
By using a structured dither addition it is demonstrated how a very simple 8-bit linear feedback shift register (LFSR) can be used to randomize a digital MASH 1-1-1 SigmaDelta modulator used for fractional-N frequency synthesizers. With this optimization, spur tones for high frequency offset from the carrier are avoided without significant area and power budget increase.
In this work a non-linear denoising system applied to continuous time signals is presented. The system employs an analog implementation of the semidiscrete wavelet transform (WT). The direct semidiscrete WT is carried out when the input signal is passed through a set of parallel filters, obtaining the wavelet decomposition into various frequency bands. The original signal is recovered by applying...
A new way to estimate the signal-to-noise ratio in SigmaDelta modulators is presented. It showed how using DC levels at the input of the modulator it is possible to predict its dynamic performance. This proposed scheme is suitable for an all digital BIST scheme which can be useful during wafer sort
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