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Research on High Isolation Analog Switch and its Application in Impedance Metrology
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摘要: 提出了一种高隔离度CMOS模拟开关电路设计，用于改善传统模拟开关隔离度有限，机械簧片开关切换时间长等缺点，并将高隔离度模拟开关应用于高精度数字采样阻抗电桥，解决电桥系统采样通道信号切换速度慢、信号泄漏影响矢量电压比率精度的难题。设计的模拟开关结构能够简化数字电桥系统，而且宽频范围内关断隔离度理论值、开关切换速度远优于传统模拟开关，在保证数字采样法阻抗高精度量值溯源前提下，提高阻抗校准速度，实用性强；采用的高精度双级电压跟随器电路用于减少模拟开关导通电阻对电桥桥路的影响。实验结果表明，提出的设计方案能够在1 kHz频率下使得数字采样阻抗电桥系统电压采集通道关断隔离度优于−140 dB，在100 Hz～100 kHz频率范围内实现快速、高精度的阻抗参量计量。Abstract: This paper proposes a high isolation CMOS analog switch circuit design aimed at ameliorating the limited isolation of traditional analog switches and the long switching time of mechanical reed switches. This high isolation analog switch is applied to a high-precision digital sampling impedance bridge, addressing issues of slow signal switching speed in bridge systems and signal leakage affecting the accuracy of vector voltage ratios. The proposed analog switch design simplifies the digital bridge system, providing superior off-isolation and switching speed across a broad frequency range compared to traditional analog switches. This ensures the high-precision traceability of impedance measurements using the digital sampling method while increasing the speed of impedance calibration, hence improving practicality. A high-precision dual-stage voltage follower circuit is also utilized to mitigate the impact of the on-resistance of the analog switch on the bridge circuit. Experimental results validate the proposed design, achieving an off-isolation better than -140 dB at 1 kHz and enabling rapid, high-precision impedance parameter measurements in the frequency range of 100 Hz to 100 kHz.
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Key words:
- metrology /
- analogue switch /
- voltage followers /
- digital sampling /
- impedance metrology
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图 2 模拟开关关断隔离度两端口测试原理图
Figure 2. Two-port test schematic for analog switch off-isolation
图 9 模拟开关通道隔离度测试系统实物图
Figure 9. Physical diagram of analog switch channel isolation test system
图 10 同轴开关与模拟开关关断隔离度比较
Figure 10. Comparison of off-isolation between coaxial switch and analog switch
表 1 T型与双T型模拟开关关断隔离度对比
Table 1. Comparison of off-isolation between T-type and double-T analog switches
频率范围 关断隔离度/dB T型 双T型 1 kHz 101.00 137.00 10 kHz 101.00 149.00 60 kHz 101.00 140.00 140 kHz 101.00 142.00 250 kHz 100.40 133.10 500 kHz 99.99 128.60 750 kHz 98.70 127.00 1 MHz 98.40 130.00 
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表 2 四通道关断隔离度测试结果
Table 2. Test results of four-channel off-isolation
测量通道 关断隔离度/dB HP-S HP-X LP-S LP-X 1 kHz −140 −140 −150 −150 2 kHz −139 −139 −146 −146 10 kHz −137 −137 −136 −136 50 kHz −133 −133 −133 −133 100 kHz −128 −128 −131 −131 500 kHz −124 −124 −126 −126 1 MHz −115 −115 −117 −117
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表 3 通道间隔离度测试结果
Table 3. Test results of inter-channel isolation
测量通道 关断隔离度/dB H对LP-S H对LP-X 1 kHz −155 −160 2 kHz −150 −153 10 kHz −144 −148 50 kHz −143 −145 100 kHz −141 −144 500 kHz −124 −123 1 MHz −114 −116
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