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Bootstrap Circuit

2017-08-15 19:05  
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Bootstrapping involves the use of positive feedback from output to input of an amplifier, of nearly unity gain, in such a way that a particular point in the circuit is "pulled up as if by its own bootstraps".Bootstrapping the substrate of a JFET amplifier reduces the distortion caused by the non-linlearity of the JFET  input capacitance. With the already high impedance of JFET and MOSFET devices anyway the need for "bootstrapping" is mostly unwarranted.In the figure, a second feedback divider bootstraps the substrate of Ul. With R{ = 500 kQ (source impedance),THD at 10 kHz was reduced an order of magnitude.A single-stage amplifier in which the output load is connected between the negative end of the anode supply and the cathode, while signal voltage is applied between grid and cathode; a change in grid voltage changes the input signal voltage with respect to ground by an amount equal to the output signal voltage.

 

Bootstrap Circuit