A self-calibrated two-point delta–sigma modulation technique for CMOS RF transmitter is proposed. This calibration technique employs voltage-controlled oscillator (VCO) and delta–sigma modulator input ports in a frequency synthesizer. By monitoring the control voltage of a loop filter, the gain mismatch between two paths can be detected and completely calibrated by modifying the gain of the VCO...

Qingyu Jia 1,2 ID , Wenying Yu 2, Li Zhou 3 and Chenghua Liang 1,* 1 College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China; [email protected] 2 Institute of Atmospheric Environment, China Meteorological Administration, Shenyang 110166, China; [email protected] 3 Chinese Academy of Meteorological Sciences, China Meteorological Administration, 46 Zhongguancun...

As part of an ongoing project to unify the treatment of symmetric lenses (of various kinds) as equivalence classes of spans of asymmetric lenses (of corresponding kinds) we relate the symmetric delta lenses of Diskin et al, with spans of asymmetric delta lenses. Because delta lenses are based on state spaces which are categories rather than sets there is further structure that needs to be accou...

To boost students' active learning and understanding of abstract scientific concepts, hands-on experiences such as experiments are necessary. Computer simulations also allow students to carry out virtually. Analog signals processed using digital signal processing because the advantages over analog processing. Numerical experiments, results, observations on band pass filtering presented. Two typ...

To understand how phosphatidylinositol 3-kinase (PI3K) modulates cell structure and function, we examined the molecular and cellular defects of a Dictyostelium mutant strain (pik1(Delta)2(Delta)) missing two (DdPIK1 and 2) of three PI3K genes, which are homologues of the mammalian p110 subunit. Levels of [32P]phosphatidylinositol 3, 4 bisphosphate (PI(3,4)P2) and [32P]phosphatidylinositol trisp...

Oversampled Sigma-Delta modulation (SDM) is becoming a standard method for implementing high-resolution A/D and D/A converters in silicon. Digital decimation lters play a fundamental role in Oversampled Sigma-Delta A/D decoders. In this paper, we rst show that Weighted Median Filters (WMF) can be used for SDM decimation lters and that these lters are readily implemented in the SDM binary domain...

In this work, we present a new proposal for the second-order Adaptive Sigma Delta Modulation (ASDM). The new proposed Adaptation scheme is based on using Operational Transconductance Amplifier (OTAs) as an Integrator and as an Amplifier to adapt the quantizer stepsize to control the voltage gain by feedback the quantizer output through adaptation scheme. The stepsize is changing up or down by t...