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In this paper, an improved cascoding CMOS bandgap reference(BGR) without opamp is presented. By incorporating a simple feedback transistor and several resistors into conventional cascoding circuit, the power-supply rejection and 2nd -order curvature compensation circuit is formed. With Spectre tool and 0.35 mum CMOS model, the simulation has been carried out and the results show that the PSRR and...
The phase noise and power optimization of a 2-GHz differential LC VCO by CMOS 0.18-mum RF 1P6M technology is presented. The key ideas to achieve phase noise optimization are delicate designs of a symmetric circuit and a technology to filter out the top-biased transistor's noise. Moreover, In order to obtain good phase noise performance with low power consumption, the oscillation output amplitudes...
Presently FFT usage in GPS receivers has been a topic of extensive study and many improved FFT-based acquisition methods with averaging correlation technique also have emerged. Although averaging arithmetic can reduce the instant processing points of FFT/IFFT, their noise performance is not promising. In this paper a novel compress-sampling algorithm for FFT-base GPS signal acquisition method is proposed...
Objective To evaluate and compare the ability to detect tumor by bis (N-ethoxy-N-ethyl dithiocarbamato) nitrido99mTc(V) [99mTcN(NOEt)2] and99mTc hexakis-2- methoxyisobutyl isonitrile [99mTc-MIBI]. Methods 99mTcN(NOEt)2 was prepared and quality control was performed using ascending thin-layer chromatography. Four mice bearing Ehrich ascites tumor cells underwent whole body planar imaging at 30 min,...
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