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0.35μm CMOS 8 5GHz1∶8分频器的设计 总被引:3,自引:0,他引:3
实现了一个基于触发器结构用 0 .35μm CMOS工艺实现的 1∶ 8分频器 .它由 3级 1∶ 2分频器单元组成 ,其中第一级为动态分频器 ,决定了整个芯片的性能 ,第二、三级为静态分频器 ,在低频下能稳定工作 .分频器采用源极耦合逻辑电路 ,并在传统的电路结构上进行改进 ,提高了电路的性能 .测试的结果表明 ,芯片工作速率超过8.5 GHz,工作带宽大于 2 GHz.电路在 3.3V电源电压下工作 ,每个 1∶ 2分频器单元的功耗约为 11m W,面积为35μm× 5 0μm .该芯片可应用于高速射频或光电收发机系统中 相似文献
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基于0.5μm CMOS工艺设计了一款LED恒流驱动芯片。该设计实现了9V~40V的输入电压,同时通过外置反馈电阻实现了电流的可调,电流范围可从10m A变化至80m A;通过验证实现了在不同工艺角下,当温度不变而输出电压从1V变化到8V的情况下,10m A和80m A电流变化误差均约±0.6%;在不同工艺角下,当输出电压不变而温度从-40℃变化到125℃时,10m A电流变化误差约为±1.5%,80m A电流变化误差约为±1.15%。设计主要包括校准器、带隙基准电路、输出运放结构以及过温保护电路,并对各个电路做详细分析。 相似文献
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实现了一个基于触发器结构用0.35μm CMOS工艺实现的1∶8分频器.它由3级1∶2 分频器单元组成,其中第一级为动态分频器,决定了整个芯片的性能,第二、三级为静态分频器,在低频下能稳定工作.分频器采用源极耦合逻辑电路,并在传统的电路结构上进行改进,提高了电路的性能.测试的结果表明,芯片工作速率超过8.5GHz,工作带宽大于2GHz.电路在3.3V电源电压下工作,每个1∶2分频器单元的功耗约为11mW,面积为35μm×50μm.该芯片可应用于高速射频或光电收发机系统中. 相似文献
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采用0.18μm CMOS工艺设计了一款6.25 GHz锁相环倍频器,该倍频器适用于12.5 Gbit/s半速率复接的串行器/解串器(SerDes)发射系统。该锁相环倍频器不仅为SerDes发射系统提供6.25 GHz的时钟,也为系统提供1.25 GHz占空比1∶4的时钟。设计中鉴频鉴相器采用真单相时钟(TSPC)触发器,电荷泵采用电流舵结构,压控振荡器采用三级双延时环路结构,20分频器中的高速五分频采用源极耦合场效应晶体管逻辑(SCFL)触发器、低速四分频采用TSPC触发器。电路芯片面积为0.492 mm×0.668 mm。测试结果显示,锁相环的锁定范围为4.78~6.6 GHz,在1.8 V电源电压下核心电路的功耗为67.5 mW。当锁相环工作在6.25 GHz时,10 MHz频偏处相位噪声为-98.5 dBc/Hz,峰峰抖动为15 ps,均方根(RMS)抖动为3.5 ps。 相似文献
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提出了一种基于电流模式施密特触发器的CCCII±弛振荡器。该电路的振荡信号周期可由接地电容线性改变,而频率则与CCCII+偏置电流成正比,PSPICE仿真结果与理论分析相符。 相似文献
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为满足微小能量收集系统的低电压、低功耗应用需求,设计了一种低温度系数的低功耗、小面积的张弛振荡器。使用自偏置Cascode复合晶体管结构分别代替传统倍增电流偏置电路中的大电阻和振荡器核心电路中在比较器输入端生成电压参考的大电阻,实现低功耗,同时达到减小电路面积,提高集成度的目的。采用0.18μm CMOS工艺进行设计,仿真结果表明,该振荡器可在0.8~1.2 V的电源电压下正常工作,在工作频率为2.2 kHz时,功耗为30 nW,工作频率的温度系数TC可达1.03×10-4/℃,芯片面积相对于同类电路至少减小了70%。 相似文献
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Resistance-to-time converter is always used for digital temperature measurement. An reset-set (RS) trigger based, relaxation oscillator based temperature measurement circuit, which is used to convert the change of thermistor sensor into a frequency signal for later processing, has been presented in this article. The RS trigger, which is composed of two inverters designed with distinct logical transition threshold voltages by changing the metal-oxide-semiconductor (MOS) transistor gains, has the same function as the Schmitt trigger in the relaxation oscillator. The advantage of the RS trigger based Schmitt trigger is that it reduces the dependence to supply voltage, chip temperature, and process variation. This temperature measurement circuit has been applied in a clinical thermometer chip that can measure temperature to an accuracy of better than 0.05 ℃ down to 1.1 V battery voltage. It is fabricated in 0.5 μm double metal single poly complementary MOS (CMOS) process. 相似文献
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A low-voltage relaxation oscillator for passive wireless microsystems is proposed. The oscillator employs a current pulse generator to generate effective hysteresis for oscillation without using a Schmitt trigger, avoiding the drawback of the high sensitivity of the frequency of Schmitt trigger relaxation oscillators to supply voltage fluctuation. The proposed oscillator has been implemented in TSMC-0.18 mum 1.8 V six-metal one-poly CMOS technology. The performance of the oscillator is validated using measurement results. 相似文献
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Mascart F. Vindevoghel J. Constant E. Blondel G. Magarschack J. 《Electronics letters》1986,22(3):122-123
A monolithic microwave FET oscillator built in GaAs is frequency-stabilised with temperature using a Schottky diode as a temperature sensor. The monolithic integrated circuit includes both the oscillator (f=7.44 GHz) and its temperature sensor. The actual performance gives a stabilisation of the frequency to better than 1 MHz in the temperature range from ?40 to +80°C. 相似文献
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给出了一个采用0.6um CMOS工艺设计的改进结构环形振荡器,电路由RC充放电回路、施密特单元以及反相延时单元组成,结构简单,工作频率受集成电路工艺参数影响小。该电路带有使能控制端,并且通过调节少量的外部元件可以改变电路的振荡频率,适用作各类中/低频数字集成电路中的时钟产生电路。分析了改进结构环形振荡器的工作原理,给出了Hspice软件环境下电路仿真方法。电路流片封装后的实际测试结果表明,用该结构的环形振荡器作为时钟产生电路,工作稳定,满足了系统工作要求。 相似文献
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描述了由直流稳压电源、霍尔传感器、单稳态触发器和D触发器组成的开关门自动照明电路。设计实现当有人推门而入时,室内照明灯自动亮起;而当有人推门而出时,照明灯自动熄灭的控制功能。 相似文献
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Kai Zhu Syed K. Islam Mohammad R. Haider Melika Roknsharifi Jeremy Holleman 《Analog Integrated Circuits and Signal Processing》2012,72(2):383-393
This paper reports a wireless sensor readout circuit for continuous physiological parameters monitoring including a potentiostat, a data generation unit and a frequency-shift-keying (FSK) modulator unit with the low drop-out (LDO) regulator for biomedical implant system. The potentiostat can generate an output potential of 0.7?V for the data generation unit. The data generation unit is designed based on a relaxation oscillator scheme and can be used to sense a current signal from any amperometric biomedical sensor and convert the signal to a square waveform in which the frequency of the square wave signal is proportional to the sensor current. FSK modulation scheme has been selected for wireless transmission. Designed with a very simple ring oscillator, this modulator integrates the modulation functionality into the oscillator itself by using the data signal to control the oscillation frequency. The prototype circuits have been fabricated in a 0.35???m bulk complementary metal-oxide semiconductor (CMOS) process. Working with a regulated 1.8?V supply, the potentiostat consumes only 2???A of current while the data generation unit can generate around 15.7?kHz output frequency with an input current of 1???A. The FSK modulator consumes a total current of around 19???A for a carrier frequency around 1?MHz. An off-chip demodulator is constructed to demodulate the data signal from the FSK modulator and the demodulated signal has less than 1.6?% variation of frequency. 相似文献
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A universal sensor interfacing circuit is presented in this paper. It is capable of giving a digital output directly proportional to various types of measured quantities, where those measured quantities are proportional to the square root of some other type of quantity. This sensor interfacing circuit is a square-rooting current-to-frequency converter. The design is based on two current-controlled resistors in CMOS technology with bisection of the input voltage used in place of the ordinary resistors within the relaxation oscillator. There is no need for highly stable voltage or current references in the proposed design. The temperature stability of the design is achieved without the need for any specific setting of the process parameters. Experimental results, obtained on a circuit implemented by discrete components, confirm the predictions of the analysis performed. The relative errors are less than 1% for the input current range from 12 µA to 650 µA, and for the output frequency range from 231 Hz to 2.625 kHz. A solution for extending the input current dynamic range is also given in the paper. 相似文献