介绍了一种新型的隔离放大电路,采用微机械开关实现“飞电容”结构。这种隔离放大电路具有许多优点:电路结构简单、尺寸小、成本低、隔离电压高、电磁兼容性能优良,很容易组成多通道隔离电路等;在30V驱动电压下测试,微机械开关的延时小于50μs,隔离电压大于110V。对设计、制造出的微机械开关隔离放大器进行了测试,证明该电路的精度优于2%。 A new type of isolation amplifier is introduced. The micro-mechanical switch is used to realize the “flying capacitor” structure. This isolation amplifier circuit has many advantages: the circuit structure is simple, small size, low cost, high isolation voltage, excellent electromagnetic compatibility, it is easy to form a multi-channel isolation circuit; at 30V drive voltage test, micro-mechanical switch delay Less than 50μs, isolation voltage greater than 110V. The design and manufacture of micro-mechanical switch isolation amplifier was tested to prove that the accuracy of the circuit is better than 2%.