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37 results on '"Mo, Tingting"'

14. A 14-b 2MSPS Low Power Sigma-Delta ADC Using Feed-Forward Structure

Author

Mo Tingting, Yan Taotao, Wang Lei, and Mao Cui

Subjects
Engineering, Spurious-free dynamic range, business.industry, Feed forward, Topology (electrical circuits), Delta-sigma modulation, CMOS, Control theory, Integrator, Low-power electronics, Hardware_INTEGRATEDCIRCUITS, Electronic engineering, Oversampling, business
Abstract

In this paper, a second-order 14 bit 2MSPS sigma-delta ADC used for data acquisition is proposed. The adopted feed-forward structure in SDM has reduced more than 50% output swing of integrator, leading to inherent low power operation compared with the conventional feedback topology. The proposed ADC, designed in TSMC 0.18μm CMOS technology, achieves 83.9dB peak SNR and 91dB SFDR with an over sampling rate of 256. Simulation result shows that the power consumption of analog SDM is only 2.1mW under a 1.8V supply.

Published
2011

35. Analysis of Input LCR Matched $N$-Path Filter.

Author

Lu, Zhijian, Jin, Jing, Mo, Tingting, and Zhou, Jianjun

Subjects
RESISTOR-inductor-capacitor circuits, ELECTRIC transformers, BROADBAND communication systems, ELECTRIC potential, CAPACITORS
Abstract

Proposed in this paper is a general parasitic-compatible LCR matching method suitable for $N$-path filter. Analysis of a conventional $L$-type matching is extended to accommodate the case of the $N$- path filter, where the different impedances of the band limited input matching network at multiple local oscillation (LO) harmonic frequencies have to be taken into consideration. Compared to the ideally wideband transformer matching technique, the proposed LCR method has advantages of smaller size and better harmonic folding rejection ratio, while keeping the same properties, such as impedance matching, in-band voltage gain, noise figure and ultimate rejection. Based on the derived equations, the procedure to determine the values of the matching components for given rejection specs has been described using design examples. [ABSTRACT FROM PUBLISHER]

Published
2016
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36. Reconfigurable Dual-Channel Multiband RF Receiver for GPS/Galileo/BD-2 Systems.

Author

Chen, Dongpo, Pan, Wenjie, Jiang, Peichen, Jin, Jing, Mo, Tingting, and Zhou, Jianjun

Subjects
ADAPTIVE computing systems, RADIOS, GLOBAL Positioning System, COMPLEMENTARY metal oxide semiconductors, RADIO frequency, ELECTRONIC amplifiers, ELECTRIC controllers
Abstract

A fully integrated dual-channel multiband RF receiver is designed and implemented for next-generation global navigation satellite systems (GNSSs) in a 0.18-\mu\ m CMOS process. Its two reconfigurable signal channels can simultaneously process any two types of 2-, 4-, or 20-MHz bandwidth signals mainly located around the RF bands of 1.2 and 1.57 GHz for GPS, Galileo, and BD-2 (aka Compass) systems, while achieving better performance (die area, noise figure, gain dynamic range) than other state-of-the-art GNSS receivers. A digital automatic gain control loop consisting of a variable gain amplifier and nonuniform 4-bit ADC is utilized to improve the receiver's robustness and performance in the presence of interferences. While drawing 25-mA current per channel from a 1.8-V supply, this RF receiver achieves a total noise figure of 2.5 dB/2.7 dB at 1.2/1.57 GHz, an image rejection of 28 dB, a maximum voltage gain of 110 dB, a gain dynamic range of 73 dB, and an input-referred 1-dB compression point of -58 dBm, with an active die area of 2.4 \ mm^2 for single channel. [ABSTRACT FROM PUBLISHER]

Published
2012
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