Op Amp Based Ac Voltage Follower Circuit With Bootstrapped Resistance - figure shows the circuit diagram of an ac coupled voltage follower with input resistance bootstrapped when an ac input voltage rides on a dc level in order to block the dc level a coupling capacitor must be used in series with the input span class news dt 28 11 2011 span nbsp 0183 32 if the capacitor were left out you see the classic gain of one non inverting lifier the input impedance of the circuit would be the parallel values of the bias resistor to ground in this case 200k and the very high input impedance of the lifier a voltage follower also called a unity gain lifier a buffer lifier and an isolation lifier is a op circuit which has a voltage gain of 1 this means that the op does not provide any lification to the signal the input impedance of the voltage follower circuit is very high typically above 1m as it is equal to that of the operational lifiers input resistance times its gain.

rin x a o also its output impedance is very low since an ideal op condition is assumed preamble a voltage follower regardless of the technology used to build it is a current lifier a small available current from the source is usually due to the circuit having a high impedance so it cannot supply enough current to drive the following circuitry various techniques can reduce these errors including inverted operating mode dc biasing small ac signal swing proper selection of the op and input impedance pensation 1 matching the p div class b factrow b twofr div class b vlist2col ul li div author dimitri danyuk div li ul ul ul div div div li begingroup there is another factor here which may be too implementation specific for the level at which your analysing the circuit but the resistor is also needed to allow the input bias current from the op a path to ground this connection forces the op.

to adjust its output voltage simply equal to the input voltage v out follows v in so the circuit is named op voltage follower the importance of this circuit does not e from any change in voltage but from the input and output impedances of the op



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