The short-distance low-power technologies for wireless access communications, including Bluetooth, Ultra-Wideband (UWB) and Wireless Fidelity (Wi-Fi), focus on the physical layer and Medium Access Control (MAC) layer....The short-distance low-power technologies for wireless access communications, including Bluetooth, Ultra-Wideband (UWB) and Wireless Fidelity (Wi-Fi), focus on the physical layer and Medium Access Control (MAC) layer. Bluetooth is a wireless protocol for exchanging data over short distances. It is an alternative to RS232 data cables. UWB is a radio technology that can be used at very low energy levels for short range. It provides flexible high-bandwidth wireless access. Wi-Fi enables the wireless connection of fast-access devices and mobile devices in Wireless Local Access Network (WLAN) and it is suitable for long distances. The standardizations of the above technologies have been developed and published soon after the emergence of these technologies. Among all the standards, Bluetooth and Wi-Fi are the most important ones.展开更多
比较器在模数转换及其他模拟功能模块中都是非常重要的器件,其速度和精度直接影响模块的功能。采用SMIC 0.18 CMOS混合信号工艺,设计了一种轨到轨电压比较器,电路结构主要包括前置放大器、锁存器和输出缓冲电路,此外,采用一种β倍增的...比较器在模数转换及其他模拟功能模块中都是非常重要的器件,其速度和精度直接影响模块的功能。采用SMIC 0.18 CMOS混合信号工艺,设计了一种轨到轨电压比较器,电路结构主要包括前置放大器、锁存器和输出缓冲电路,此外,采用一种β倍增的自偏置基准电路提供偏置电流。结果表明,在3.3 V的供电电压下,提供共模范围为300 m V^3.3 V的信号,可分辨输入信号的最小频率为200 MHz,单级运放相位裕度大于60°,输出信号占空比为40%~60%,比较阈值约为10 m V,输入输出延时小于5 ns,功耗小于18 m W,版图面积小于200μm×150μm。该比较器的失真较小,在整个输入信号范围内有较高的共模抑制比,较大限度地提高了电路的性能。展开更多
文摘The short-distance low-power technologies for wireless access communications, including Bluetooth, Ultra-Wideband (UWB) and Wireless Fidelity (Wi-Fi), focus on the physical layer and Medium Access Control (MAC) layer. Bluetooth is a wireless protocol for exchanging data over short distances. It is an alternative to RS232 data cables. UWB is a radio technology that can be used at very low energy levels for short range. It provides flexible high-bandwidth wireless access. Wi-Fi enables the wireless connection of fast-access devices and mobile devices in Wireless Local Access Network (WLAN) and it is suitable for long distances. The standardizations of the above technologies have been developed and published soon after the emergence of these technologies. Among all the standards, Bluetooth and Wi-Fi are the most important ones.
文摘比较器在模数转换及其他模拟功能模块中都是非常重要的器件,其速度和精度直接影响模块的功能。采用SMIC 0.18 CMOS混合信号工艺,设计了一种轨到轨电压比较器,电路结构主要包括前置放大器、锁存器和输出缓冲电路,此外,采用一种β倍增的自偏置基准电路提供偏置电流。结果表明,在3.3 V的供电电压下,提供共模范围为300 m V^3.3 V的信号,可分辨输入信号的最小频率为200 MHz,单级运放相位裕度大于60°,输出信号占空比为40%~60%,比较阈值约为10 m V,输入输出延时小于5 ns,功耗小于18 m W,版图面积小于200μm×150μm。该比较器的失真较小,在整个输入信号范围内有较高的共模抑制比,较大限度地提高了电路的性能。
