LINE_DRIVER_PROVIDES_FULL_RAIL_EXCURSIONS

Published:2009/7/1 22:33:00 Author:May | From:SeekIC

The login input is applied to opto-isolators U1 and U2 with, respectively, npn and PnP emitter follower outputs.Dc balance is adjusted by potentiometer R2. The emitter follower drive the gates of Q1 and Q2, the complementary TMOS pairs. With a±12V 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 .This circuit applies the output to transformes T1 which is rectified by diode bridge D3,regulated by U3 and U4, and then applied to the collectors of U1 and U2. Diodes D1 and D2 are forward-biased when 12-V supplies are used, but they are back-biased when the 18-V boost is used



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