background: hereditary non-polyposis colorectal cancer (hnpcc) is a common hereditary cancer predisposing syndrome has molecular and clinicopathological features still have remained ambiguous within iranian populations. we discuss in this article some molecular and clinicopathological features of the condition. methods: the study was a descriptive retrospective and designed on 1659 colorectal c...

A Memory Cross Volterra model for Doherty power amplifiers (PA) with delay mismatch is presented in this letter. During the design process of amplifier, gain, efficiency and operation bandwidth are mostly considered. Delay difficult to avoid kind dual-path circuit, which reduces modeling performance traditional behavioral models. The proposed Model (MCVM) derived from combination three memory p...

Mismatch-shaping digital-to-analog converters (DACs) have become widely used in high-performance delta–sigma data converters because they facilitate delta–sigma modulators with multibit quantization. Relative to single-bit quantization, multibit quantization significantly relaxes the analog circuit performance necessary to achieve a given level of data converter precision, but significant digit...

As discussed in Chapter 1, in an outphasing power amplifier system, the AM of a bandpass waveform is transformed into PM of two signals prior to power amplification, and finally recovered by recombining the two amplified signals. As shown in Figure 1.16, with this approach, two highly efficient nonlinear power amplifiers can be used without distorting the original signal. This is the main advan...

The buck converter has been known to exhibit chaotic behavior in a wide parameter range. In this paper, the resonant parametric perturbation method is applied to control chaos in a voltage-mode controlled buck converter. In particular, the effects of phase shift and frequency mismatch in the perturbing signal are studied. It is shown that the control power can be significantly reduced if the pe...