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This paper proposes an area-saving dual-path loop filter(LPF)for low-voltage integrated phase-locked loops(PLLs).With this LPF,output current of the lowpass-path charge-pump(CP)is B times(B〉1)as great as that of the integration-path CP.By adding voltages across these two paths,the zero-capacitance is magnified B times equivalently.As a result,the chip size is greatly reduced.Based on this LPF,a 1.2 V 3.5 GHz-band PLL is fabricated in SMIC 0.18μm RFCMOS technology.Its zero-capacitance is only 1/30 of that in conventional second-order LPFs. Measured data show that,at a frequency of 3.20 GHz,phase noise is–120.2 dBc/Hz at 1 MHz offset,reference spur is–72 dBc,and power is 24 mW. 相似文献
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射频识别技术RFID(Radio Frequency Identification)是利用射频信号通过空间耦合实现非接触信息传递并通过所传递的信息达到识别目的的技术,它是自动识别技术在无线电技术方面的具体应用和发展。在HF频段通过线圈耦合磁场载波信号提供能量是RFID最大的特点,大大提高了卡片的使用寿命。文章首先分析了基于ISO/IEC15693协议的无源标签SoC系统结构,主要分析前端电路和数字基带处理电路的模块功能,详细分析了各个分模块的功能参数要求;其次对协议防冲撞指令进行了深入探讨,并基于Slot时隙EOF提出指令操作流程。 相似文献
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This paper proposes a simple method of measuring differentially-excited on-wafer RF CMOS spiral inductor-like components.This method requires only two common ‘G-S-G' probes and an ordinary two-port VNA.Using a network instead of a detailed equivalent circuit, this method completes the de-embedding with only one ‘Through' dummy, and thus the measurements are greatly simplified.By designing the ports ‘Open' or ‘Shortcircuited' deliberately, a multi-port transformer can be transformed into three two-port networks with different terminators.Then, couplings between the two coils can be solved, and the differentially-excited scattering parameters(S-parameters) can be constructed.Also, a group of differential inductors and transformers were designed and measured, and then comparisons between simulated and measured electromagnetic results are performed to verify this method. 相似文献
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设计了一个应用于18位高端音频模数转换器(ADC)的三阶低功耗ΣΔ调制器. 调制器采用2-1级联结构,通过优化调制器系数来提高其动态范围,并减小调制器输出频谱中的杂波. 电路设计中采用栅源自举技术实现输入信号采样开关,有效提高了采样电路的线性度;提出一种高能效的A/AB类跨导放大器,在仅消耗0.8mA电流的情况下,达到100V/μs以上的压摆率. 针对各级积分器不同的采样电容,逐级对跨导放大器进行进一步功耗优化. 调制器在中芯国际0.18μm混合信号CMOS工艺中流片,芯片核心面积为1.1mm×1.0mm. 测试结果表明在22.05kHz带宽内,信噪失真比和动态范围分别达到91dB和94dB. 在3.3V电源电压下,调制器功耗为6.8mW,适合于高性能、低功耗音频模数转换器应用. 相似文献
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