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提出了一种能够传输高速信号的多路选择器,并为其设计了一种低失真、宽带模拟开关.所提出开关的栅源过驱动电压由nMOS和pMOS的开启电压之和决定,并能够确保输入变化时,开关的栅源电压与阈值电压之差(VGST)保持恒定,从而基本消除了体效应的影响.采用TSMC 0.18μm CMOS工艺,HSPICE仿真结果表明,输入信号在0.3~1.7V之间变化时,开关的VGST基本保持恒定,其-3dB带宽大于10GHz,当输入频率为1GHz时,其无杂散动态范围为67.11dB;开关的开启时间为2.98ns ,关断时间为1.35ns,确保了多路选择器的break-before-make特性.该结构可应用于高速信号传输系统中.
A multi-channel selector capable of transmitting high-speed signals is proposed and a low-distortion, wide-band analog switch is designed. The proposed gate-source over-drive voltage of the switch is determined by the sum of the turn-on voltages of nMOS and pMOS, When the input is changed, the difference between the gate-source voltage and the threshold voltage (VGST) of the switch is kept constant, so that the effect of the body effect is basically eliminated.The simulation results of HSPICE using TSMC 0.18μm CMOS technology show that the input signal is between 0.3V and 1.7V The VGST of the switch is basically constant while the -3 dB bandwidth of the switch is greater than 10 GHz. The spurious-free dynamic range of the switch is 67.11 dB when the input frequency is 1 GHz. The on-time of the switch is 2.98 ns and the turn-off time is 1.35 ns. This ensures that the multiplexer’s break-before-make feature can be applied to high-speed signal transmission systems.