摘要：In this paper, new complex band pass filter architecture for continuous time complex band pass sigma delta modulator is presented. In continuation of paper the modulator is designed for GPS and Galileo receiver. This modulator was simulated in standard 0.18 μm CMOS TSMC technology and has bandwidth of 2MHz and 4MHz for GPS and Galileo centered in 4.092 MHz. The dynamic range (DR) is 56.5/49 dB (GPS/Galileo) at sampling rate of 125 MHz. The modulator has power consumption of 4.1 mw with 3 V supply voltage.

摘要：This paper presents the design and experimental results of a continuous-time (CT) sigma-delta (ΣΔ) modulator with data-weighted average (DWA) technology for WiMAX applications. The proposed modulator comprises a third-order active RC loop filter, internal quantizer operating at 160 MHz and three DAC circuits. A multi-bit quantizer is used to increase resolution and multi-bit non-return-to-zero (NRZ) DACs are adopted to reduce clock jitter sensitivity. The NRZ DAC circuits with quantizer excess loop delay compensation are set to be half the sampling period of the quantizer for increasing modulator stability. A dynamic element matching (DEM) technique is applied to multi-bit ΣΔ modulators to improve the nonlinearity of the internal DAC. This approach translates the harmonic distortion components of a nonideal DAC in the feedback loop of a ΣΔ modulator to high-frequency components. Capacitor tuning is utilized to overcome loop coefficient shifts due to process variations. The DWA technique is used for reducing DAC noise due to component mismatches. The prototype is implemented in TSMC 0.18 um CMOS process. Experimental results show that the ΣΔ modulator achieves 54-dB dynamic range, 51-dB SNR, and 48-dB SNDR over a 10-MHz signal bandwidth with an oversampling ratio (OSR) of 8, while dissipating 19.8 mW from a 1.2-V supply. Including pads, the chip area is 1.156 mm2.

摘要：A monolithic optoelectronic integrated circuit chip on a silicon-on-insulator is designed and fabricated based on complementary metal oxide semiconductor compatible *** chip integrates an optical Mach-Zehnder modulator (MZM) and a CMOS driving circuit with the amplification *** results show that the extinction ratio of the MZM is close to 20dB and the small-signal gain of the CMOS driving circuit is about 26.9dB.A 50m V 10 MHz sine wave signal is amplified by the driving circuit,and then drives the MZM successfully.

摘要：Modulating the extracellular matrix microenvironment is critical for achieving the desired macrophage phenotype in immune investigations or tumor *** de novo protein design and biosynthesis techniques,herein,we designed a biomimetic polypeptide self-assembled nano-immunomodulator to trigger the activation of a specific macrophage *** was intended to be made up of(GGSGGPGGGPASAAANSASRATSNSP)n,the RGD motif from collagen,and the IKVAV motif from *** combination of these domains allows the biomimetic polypeptide to assemble into extracellular matrix-like nanofibrils,creating an extracellular matrix-like milieu for ***,changing the concentration further provides a facile route to fine-tune macrophage polarization,which enhances antitumor immune responses by precisely resetting tumor-associated macrophage immune responses into an M1-like phenotype,which is generally considered to be tumor-killing macrophages,primarily antitumor,and *** metal or synthetic polymer-based nanoparticles,this polypeptide-based nanomaterial exhibits excellent biocompatibility,high efficacy,and precise tunability in immunomodulatory *** encouraging findings motivate us to continue our research into cancer immunotherapy applications in the future.

摘要：采用XH0180.35μmCMOS工艺设计了一种应用于磁阻角度传感器的SigmaDelta调制器.由于实际运放的增益都是有限的,使得开关电容积分器的信号传输函数的极点发生偏移,进而影响ADC精度,本文采用有限增益补偿技术减小运放增益对开关电容积分器的影响.该调制器采用两阶1bit全反馈结构,信号带宽12KHz,采样频率6.25MHz.后仿结果表明,在2.5V电源电压下,调制器的整体功耗为4mW.核心电路版图尺寸为0.45mm×0.3mm.在-40℃~150℃,各个工艺角的ENOB≥***=165.