共查询到20条相似文献,搜索用时 15 毫秒
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相比于逐个信道接收的窄带信号而言,宽带接收机具有全概率接收的优势。为了解决接收宽带信号所需要的模/数(A/D )转换采样率高、后续信号处理设备速度慢的问题,讨论了如何在A/D高速采样后使用多种滤波器级联的方法来进行多速率处理,最终达到降速率的目的。 相似文献
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设计了应用于GMSK调制,工作在2.4GHz,CMOS全差分的∑-△频率综合器.调制器中采用预补偿的分数N锁相环.推导了Ⅱ型三阶锁相环的传输函数,并指出影响环路传输函数的重要参数.介绍了校准重要的环路参数的方法.锁相环设计中采用差分调节的LC压控振荡器和全差分的电荷泵.设计的电路利用0.18μm 1P6M CMOS工艺进行仿真.由于锁相环的组成模块中采用了低功耗设计,锁相环的功耗仅为11mW左右,调制器的数据率达到2Mb/s. 相似文献
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设计了应用于GMSK调制,工作在2.4GHz,CMOS全差分的∑-△频率综合器.调制器中采用预补偿的分数N锁相环.推导了Ⅱ型三阶锁相环的传输函数,并指出影响环路传输函数的重要参数.介绍了校准重要的环路参数的方法.锁相环设计中采用差分调节的LC压控振荡器和全差分的电荷泵.设计的电路利用0.18μm 1P6M CMOS工艺进行仿真.由于锁相环的组成模块中采用了低功耗设计,锁相环的功耗仅为11mW左右,调制器的数据率达到2Mb/s. 相似文献
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介绍了一种新型的功率放大器,通过Sigma-Delta调制和PWM(脉宽调制)技术,将音频数字信号转换成PWM信号,经外接的模拟低通滤波器还原出原始的音频信号.该功率放大器在保持高品质声音的同时能够极大地提高电源的使用效率.分析了信号处理过程中非线性误差产生原因,提出了相应的纠正措施,还介绍了PWM和高阶Sigma-Delta调制器的设计及实现方法. 相似文献
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介绍了一个200kHz信号带宽、用于低中频结构GSM射频接收机的高精度ΣΔ调制器. 为了达到高线性和稳定性,调制器采用2-1级联单比特的结构实现. 电路在0.18μm CMOS工艺下流片验证,核心面积为0.5mm×1.1mm. 调制器工作在19.2MHz的采样频率,在3V电源电压下功耗为5.88mW. 测试结果表明,在200kHz信号带宽,过采样率为64的条件下,调制器达到84.4dB动态范围,峰值SNDR达到73.8dB,峰值SNR达到80dB. 相似文献
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针对OFDM-UWB标准超宽带收发系统中数模转换器(DAC)的要求,设计了一款8位650MHz采样速率电流驱动型数模转换器(Current-steering DAC)。为了提高静态性能,本设计通过蒙特卡洛分析确定电流源最佳尺寸并采用双中心版图技术;为了提高动态性能,文中采用共源共栅电流源结构,对开关电压降摆幅处理并在数字输入端前加入插值滤波器。测试结果表明,DAC的积分非线性(INL)和差分非线性(DNL)分别为0.3LSB和0.41LSB,650MHz转换速率下带内奈奎斯特无杂散动态范围(SFDR)为41dB。整体面积为1.8cm×1.3cm,其中DAC面积为0.8cm×0.8cm。 相似文献
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介绍了一个200kHz信号带宽、用于低中频结构GSM射频接收机的高精度∑△调制器.为了达到高线性和稳定性,调制器采用2-1级联单比特的结构实现.电路在0.18μm CMOS工艺下流片验证,核心面积为0.5mm×1.1mm.调制器工作在19.2MHz的采样频率,在3V电源电压下功耗为5.88mW.测试结果表明,在200kHz信号带宽,过采样率为64的条件下,调制器达到84.4dB动态范围,峰值SNDR达到73.8dB,峰值SNR达到80dB. 相似文献
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Mehmet Rasit Yuce Wentai Liu John Damiano Bhaskar Bharath Paul D. Franzon Numan S. Dogan 《IEEE transactions on circuits and systems. I, Regular papers》2007,54(2):420-431
A low-power phase-shift keying demodulator integrated circuit (IC) has been implemented using silicon-on-insulator CMOS technology for deep space and satellite applications. The demodulator employs double differential detection to increase its robustness to the Doppler shift caused by the movement of the space vehicle and sampling technique with 1-bit analog-to-digital converter (ADC) at the front to reduce the complexity and power dissipation. In particular, digital decimation is used after sampling to achieve a low power implementation of multirate transmission. Operating at ultra-high-frequency (435 MHz), the receiver system supports a wide range of data rates (0.1-100 Kbps). From test results, the power consumption of the demodulator circuit including the 1-bit ADC is below 1 mW for data rates up to 100 Kbps 相似文献
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Rong Wang Ray Siferd Robert L. Ewing 《Analog Integrated Circuits and Signal Processing》2001,28(2):149-160
This paper presents the design and simulation of a 9-Tap CMOS Analog Discrete-Time Finite Impulse Response (FIR) Filter system. This unique design features a Circular Buffer Architecture which achieves high sampling rate that can be easily expanded to improve speed and extended to higher order filters. Novel area-efficient four quadrant CMOS analog adder and multiplier circuits are employed to respond for high frequency and wide linear range inputs. The layout for all circuits has been realized using the design tool MAGIC with a 1.2 m CMOS process. The performance for each circuit and the whole system are characterized using HSPICE simulation based on the extracted MAGIC netlist. The 9-tap filter was designed to achieve 5 MHz sampling rate. The implemented design requires a total chip area of 1690.9 m by 2134.2 m and ±5 volt power supply. 相似文献
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Low supply voltages in modern CMOS technologies are expected to reduce the maximum resolution of analog to digital converters in voltage mode operation. This paper outlines the functionality and possibilities of switched current (SI) circuit techniques in medium accuracy ΔΣ modulators. Starting with the presentation of different kinds of switched current cells, this paper gives an overview about the simulated performance followed by a comparison of switched current and switched capacitor circuits. A prospect of the future of switched current circuits with regard to future CMOS technologies is given. 相似文献
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Valeri Mladenov Hans Hegt Arthur van Roermund 《Analog Integrated Circuits and Signal Processing》2003,36(1-2):47-55
In this paper we present an approach for stability analysis of high order Sigma-Delta modulators. The approach is based on a parallel decomposition of the modulator. In this representation, the general N-th order modulator is transformed into decomposition of low order modulators, which interact only through the quantizer function. In the simplest case of the loop filter transfer function with real distinct poles, the low order modulators are N first order ones. The decomposition considered helps to extract the sufficient conditions for stability of the N-th order modulator. They are determined by the stability conditions of each of the low order modulators but shifted with respect to the origin of the quantizer function, because of the influence of all other low order modulators. The approach is generalized for the case of repeated poles of the loop filter transfer function. 相似文献