开关电容阵列中高带宽跨阻前置放大器设计

Large Bandwidth RGC Transimpedance Preamplifier Design in SCA

为了放大高能粒子物理实验中高精度定时信号,使其适用于开关电容阵列电路的采集范围与幅度,设计高带宽RGC型跨阻前置放大器。此放大器具有低输入阻抗,高带宽,高跨导的特点。采用TSMC 0.25μmCMOS工艺,2.5V单电源供电。仿真结果表明,该前置放大器跨阻增益为5K欧姆,一3dB带宽为953MHz,探测器输入电容在一定范围变化对带宽影响不大。

A Large Bandwidth RGC Transimpedance Preamplifier is designed for amplifying the high-fidelity timing singal in Switch Capacitance Array chip application. This amplifier have characteristics of low input impedance, large bandwidth, high transimpedance. It will be made under TSMC 0. 25/,m CMOS technology, and the supply voltage is single 2. 5V. Simulation results indicate： the transimpedance is 5000 ohm, -3dB BW is 953MHz, and the detector output capacitance have litter effect on the bandwidth in some range.