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首页> 外文期刊>IEEE Journal of Solid-State Circuits >An efficient CMOS line driver for 1.544-Mb/s T1 and 2.048-Mb/s E1 applications
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An efficient CMOS line driver for 1.544-Mb/s T1 and 2.048-Mb/s E1 applications

机译:适用于1.544-Mb / s T1和2.048-Mb / s E1应用的高效CMOS线路驱动器

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摘要

A CMOS operational amplifier (OPAMP) for use as a line driver for high-speed T1/E1 data communication link is described. The differential output swing, using a single 3.3-V power supply, is 5.2-V peak-to-peak on a 20-/spl Omega/ load. Novel circuits are used to control the closed-loop output impedance, quiescent bias current, and frequency compensation to ensure stable operation over varying temperature and load conditions. A special circuitry tristates the output in case of power-supply failure. The OPAMP achieves a unity-gain bandwidth of 35 MHz with only 10 mA of quiescent current. A new output-current-sense circuitry is used to provide a current feedback to adjust the output impedance for proper line termination as well as to provide short-circuit protection from excessive output currents. Using 0.35-/spl mu/m n-well CMOS technology, the amplifier occupies 0.69 mm/sup 2/ of area.
机译:描述了用作高速T1 / E1数据通信链路的线路驱动器的CMOS运算放大器(OPAMP)。在20- / spl Omega /负载下,使用单个3.3V电源的差分输出摆幅为5.2V峰峰值。新型电路用于控制闭环输出阻抗,静态偏置电流和频率补偿,以确保在变化的温度和负载条件下稳定运行。如果电源出现故障,专用电路会将输出置于三态。 OPAMP仅静态电流为10 mA即可达到35 MHz的单位增益带宽。新的输出电流检测电路用于提供电流反馈,以调整输出阻抗以实现正确的线路端接,并提供针对过量输出电流的短路保护。使用0.35- / splμ/ m n阱CMOS技术,该放大器占用0.69 mm / sup 2 /的面积。

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