Line driver provides full rail excursions


The logic input is applied
to opto-isolators Ul and U2 with, respectively, npn and pnp emitter
follower outputs. Dc balance is adjusted by potentiometer R2. The
emitter followers drive the gates of Ql and Q2, the complementary TMOS
pairs. With a ±12 V supply, the swing at the common source output point
is about 12 V peak-to-peak. By adding a ± 18-V boost circuit, as
shown, the output swing can approach the rail swing.


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