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正随着消费产业的复苏,电视制造商正在寻找最新技术来支持中国所有的电视广播信号和工作模式,同时降低生产成本并缩短上市时间。另外,今年CES展出的超薄电视也将带动半导体厂商推出更轻薄的器件。 相似文献
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This paper presents the polyphase filter design for the tuner of DTV front-end system. The polyphase filter is designed with an active circuit to improve the chip performance. Most of passive capacitor and resistor components are replaced with MOS transistors. The proposed method not only can reduce the chip area but also gain the signal level. For the prototyping implementation, the current channel bands in Taiwan are referred, which the frequency range is from 530 to 602 MHz for DTV programs. In experiments, the polyphase filter can achieve 85 dB for the image rejection in the center frequency. The main signal can be gained about 2-5 dB without using extra amplifier. The chip size is about 0.09 mm2, and the average power dissipation is about 15 mW, when the chip technology employed TSMC 0.35 μm CMOS process. The proposed chip outperforms with less area and higher gain. 相似文献
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一种基于单转差电路和电阻衰减网络的适用于电视调谐器的可变增益低噪声放大器 总被引:1,自引:1,他引:0
本文给出了一种基于单端转差分电路和电阻衰减网络的高动态范围可变增益低噪声放大器,该宽带低噪放可以应用于电视调谐器应用。本文给出了单端转差分电路详细的噪声和线性度分析和比较并提出了一种电阻衰减网络,该衰减网络提供每级6dB的恒定衰减和输入阻抗匹配。芯片在SMIC 0.18μm CMOS 1P6M的工艺下制造,测试结果表明,在1.8V电源电压下,该低噪放最大增益为21.3dB,最小噪声系数为3.0dB,IIP3和IIP2分别为0.9dBm和26.3dBm,增益范围达36.4dB,总体功耗小于18mW。 相似文献
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WANGFang. WANGGuang-Wei LUJian-Fa 《核技术(英文版)》2004,15(1):1-3
Eight 500 MHz cavities are applied in the storage ring of the Shanghai Synchrotron Radiation Factility(SSRF). In order to tune the cavities for different changing parameters and operation modes, the control system is essential for operations, The tuning is achieved by synchronizing the drive signal and the cavity probe signal. The error signal defined as their subtraction is amplified and used to drive a stepping motor, which in turn moves a metallic plunger in or out of the cavity by programmable logic controller (PLC). The tune speed is set to be 1 kHz/s. 相似文献
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本文介绍大信号负载牵引测试简况、负载牵引测试的目的和意义,并重点提出以调配器为核心组建负载牵引自动测试系统的技术方案,较好地解决了微波功率FET的大信号测试问题. 相似文献
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设计了一种电视用Tuner(电子调谐器)调试评价系统,该系统能够对数模一体Tuner单品进行性能调试和评价,其核心硬件是Tuner测试夹具和视频解码回路。测试时只需将Tuner安置于夹具上,并依次与控制PC、视频解码回路、显示器等设备相连接,待系统上电运行稳定后,即可通过安装于PC中的应用程序进行测试。本系统操作简单,携带方便,结果准确,不但适用于实验室环境,同时也可满足户外复杂现地信号的测试。 相似文献
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设计了一种体积更小的TV射频信号电路系统以取代传统高频头.该系统基于Silicon Tuner、配合数字解调芯片、模拟解调芯片以及外围电路共同完成TV射频信号的处理,满足中国大陆及香港地区模拟电视广播标准和中国数字电视地面广播传输标准GB20600-2006,可应用于超薄平板电视信号终端接收机中. 相似文献