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The input changing circuit using operational amplifier

2015-01-04 05:14  
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The input changing circuit using operational amplifier
Figure a shows a voltage follower, the input signal source resistance RE > 20MΩ, voltage amplification coefficient Vu = 1. In figure b, it uses the first connected field effect source follower circuit to further increase the RE. The RE value is related to FET parameters, and it can be high to 1GΩ. The bypass connected FET can be used to increase the put.