This circuit was found in a Texas Instruments handbook about operational amplifier. It has a very high input impedance and must be powered from a dual supply. The input impedance is given by a voltage foolower and can reach many gigaohm.
![](/images/sampledata/cb/cir0782_0001.png)
This circuit was found in a Texas Instruments handbook about operational amplifier. It has a very high input impedance and must be powered from a dual supply. The input impedance is given by a voltage foolower and can reach many gigaohm.