共查询到19条相似文献,搜索用时 171 毫秒
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本工作提出的具有频率输出的硅压力传感器是建立在CMOS环形振荡器基础上的,该环形振荡器是放置在传感器芯片的薄膜上的.由于压力压阻效应,施加的压力在薄膜上产生的机械应力改变了环形振荡器中MOSFET载流子的迁移率,从而MOSFET的漏电流及相应的环振频率成为压力的函数. 相似文献
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Abel Raynus 《电子设计技术》2008,15(10):92-92
在很多应用中,频率变换级包括有一只缓冲器.最好还有一些额外的电压增益电路;一只混频器:还有一些滤波电路。可以简单地将混频器功能与放大器集成起来.从而省掉混频器前的放大器。有种低价的实现办法是使用一只带掉电禁用功能的放大器。当用一个方波本振驱动禁用脚时,振荡器频率的方波将输入信号倍频,发生频率变换。 相似文献
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一种实用的电压控制环形振荡器 总被引:4,自引:0,他引:4
本文介绍了两种在集成电路中得到广泛应用的、作为内部时钟源的环形振荡器;RC环形振荡器和电压控制环形振荡器,并对引起振荡频率变化的关键因素进行了分析。 相似文献
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本文介绍了两种在集成电路中得到广泛应用的,作为内部时钟源的环形振荡器,RC环形振荡器和电压控制环形振荡器,并对引起振荡频率变化的关键因素进行了分析。 相似文献
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本文介绍了两种在集成电路中得到广泛应用的、作为内部时钟源的环形振荡器:RC环形振荡器和电压控制环形振荡器,并对引起振荡频率变化的关键因素进行了分析。 相似文献
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To-Po Wang Chia-Chi Chang Ren-Chieh Liu Ming-Da Tsai Kuo-Jung Sun Ying-Tang Chang Liang-Hung Lu Huei Wang 《Microwave Theory and Techniques》2006,54(1):88-95
A downconversion double-balanced oscillator mixer using 0.18-/spl mu/m CMOS technology is proposed in this paper. This oscillator mixer consists of an individual mixer stacked on a voltage-controlled oscillator (VCO). The stacked structure allows entire mixer current to be reused by the VCO cross-coupled pair to reduce the total current consumption of the individual VCO and mixer. Using individual supply voltages and eliminating the tail current source, the stacked topology requires 1.0-V low supply voltage. The oscillator mixer achieves a voltage conversion gain of 10.9 dB at 4.2-GHz RF frequency. The oscillator mixer exhibits a tuning range of 11.5% and a single-sideband noise figure of 14.5 dB. The dc power consumption is 0.2 mW for the mixer and 2.94 mW for the VCO. This oscillator mixer requires a lower supply voltage and achieves a higher operating frequency among recently reported Si-based self-oscillating mixers and mixer oscillators. The mixer in this oscillator mixer also achieves a low power consumption compared with recently reported low-power mixers. 相似文献
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The paper presents a novel experimental method to evaluate AC hot-carrier lifetime of a ring oscillator (RO). By using a series of different stages of ring oscillators (DSROs), the new method allows one to maintain a constant frequency (f0) and obtain a closer value between pulse-to-pulse voltage (Vp-p) and bias condition throughout the RO lifetime testing. These two achievements eliminate the innate flaws in conventional RO hot-carrier test method. Hence, a more reliable AC lifetime of RO is expected 相似文献
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M. Yu. Tretyakov S. E. Tretyakova E. F. Fedorenko 《Journal of Infrared, Millimeter and Terahertz Waves》2007,28(10):839-847
A new kind of harmonic mixer for use in phase locking systems for MM-wave oscillators is presented. The mixer has compact design and combines directional coupler and conventional harmonic mixer in one element. Construction and features of the mixer are discussed. Experimentally measured main characteristics of the mixer are presented. Possibility of continuous frequency scan of phase locked MM-wave oscillator within a full waveguide band is demonstrated. 相似文献
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An innovative,thermally-insensitive phenomenon of cascaded cross-coupled structures is found.And a novel CMOS temperature sensor based on a cross-coupled structure is proposed.This sensor consists of two different ring oscillators.The first ring oscillator generates pulses that have a period,changing linearly with temperature.Instead of using the system clock like in traditional sensors,the second oscillator utilizes a cascaded cross-coupled structure to generate temperature independent pulses to capture the result from the first oscillator.Due to the compensation between the two ring oscillators,errors caused by supply voltage variations and systematic process variations are reduced.The layout design of the sensor is based on the TSMC13G process standard cell library.Only three inverters are modified for proper channel width tuning without any other custom design.This allows for an easy integration of the sensor into cell-based chips.Post-layout simulations results show that an error lower than±1.1℃ can be achieved in the full temperature range from-40 to 120℃.As shown by SPICE simulations,the thermal insensitivity of the cross-coupled inverters can be realized for various TSMC technologies:0.25/μm,0.18μm,0.13μm,and 65 nm. 相似文献
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A study of phase noise in colpitts and LC-tank CMOS oscillators 总被引:1,自引:0,他引:1
Andreani P. Xiaoyan Wang Vandi L. Fard A. 《Solid-State Circuits, IEEE Journal of》2005,40(5):1107-1118
This paper presents a study of phase noise in CMOS Colpitts and LC-tank oscillators. Closed-form symbolic formulas for the 1/f/sup 2/ phase-noise region are derived for both the Colpitts oscillator (either single-ended or differential) and the LC-tank oscillator, yielding highly accurate results under very general assumptions. A comparison between the differential Colpitts and the LC-tank oscillator is also carried out, which shows that the latter is capable of a 2-dB lower phase-noise figure-of-merit (FoM) when simplified oscillator designs and ideal MOS models are adopted. Several prototypes of both Colpitts and LC-tank oscillators have been implemented in a 0.35-/spl mu/m CMOS process. The best performance of the LC-tank oscillators shows a phase noise of -142dBc/Hz at 3-MHz offset frequency from a 2.9-GHz carrier with a 16-mW power consumption, resulting in an excellent FoM of /spl sim/189 dBc/Hz. For the same oscillation frequency, the FoM displayed by the differential Colpitts oscillators is /spl sim/5 dB lower. 相似文献
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《Microwave Theory and Techniques》1983,31(12):1030-1038
Measurements on a 6-GHz single-sideband (SSB) balun-coupled mixer revealed a feedthrough of RF signals between the two mixer sections that caused the IF outputs to be unbalanced at the +-90° local oscillator (LO) phase differences when using a ring diode quad. Using a bridge diode quart in this same mixer eliminated this IF output unbalance. These measurements also give conclusive evidence that the balun-coupled mixer has a short-circuited image frequency voltage with the ring diode quad and an open-circuited image frequency voltage with the bridge diode quad. These two image frequency impedance conditions are independent of circuit terminating impedances and solely depend on the image frequency current path being completed or interrupted by the ring or bridge diode quads, respectively. 相似文献
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An innovative, thermally-insensitive phenomenon of cascaded cross-coupled structures is found. And a novel CMOS temperature sensor based on a cross-coupled structure is proposed. This sensor consists of two different ring oscillators. The first ring oscillator generates pulses that have a period, changing linearly with temperature. Instead of using the system clock like in traditional sensors, the second oscillator utilizes a cascaded cross-coupled structure to generate temperature independent pulses to capture the result from the first oscillator. Due to the compensation between the two ring oscillators, errors caused by supply voltage variations and systematic process variations are reduced. The layout design of the sensor is based on the TSMC13G process standard cell library. Only three inverters are modified for proper channel width tuning without any other custom design. This allows for an easy integration of the sensor into cell-based chips. Post-layout simulations results show that an error lower than ±1.1 °C can be achieved in the full temperature range from 40 to 120 °C. As shown by SPICE simulations, the thermal insensitivity of the cross-coupled inverters can be realized for various TSMC technologies: 0.25 μm, 0.18 μm, 0.13 μm, and 65 nm. 相似文献
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Mohammad Jafar Hemmati Sasan Naseh 《Analog Integrated Circuits and Signal Processing》2012,70(3):437-442
This work introduces a new low noise second-harmonic quadrature voltage controlled oscillator (QVCO) made by coupling two
identical cross-connected LC voltage controlled oscillators. In each of the core oscillators the substrate nodes of the MOS
varactors, and also the substrate nodes of the cross-connected MOSFETs are configured in such a way that they act as common
mode nodes. Then the core oscillators are coupled together via direct connection of the substrates of the MOS varactors in
one of the core oscillators to the substrates of the cross-connected MOSFETs in the other core oscillator, and vice versa.
No extra elements are used for coupling of the two core oscillators and therefore no extra noise sources are imposed on the
circuit. Operation of the proposed QVCO was investigated with simulation using a commercial 0.18 μm RF CMOS technology: it
shows a power dissipation of 9.7 mW from a 1.8 V supply voltage and a simulated phase noise of −125.5 dBc/Hz at 1 MHz offset
from center oscillation frequency of 5 GHz. Since the tail transistor can be eliminated, the proposed QVCO can operate with
supply voltages as low as 0.5 V, as confirmed with simulation. 相似文献