VOLTAGE_CONTROLLED_PHASE_SHIFTER

Published:2009/7/6 1:06:00 Author:May | From:SeekIC

Circuit shifts carrier 180° by sensing polarity of modulating voltage. Operating range is 5 kHz to 10 MHz. Circuit can also be used to convert unipolar pulses to alternate bipolar pulses or vice versa when synchronized square wave is sup-plied to control input. With 0 V at base of Q2, Q3 will amplify RF voltage applied to input, without phase shift. To actuate switch and provide 180° phase shift, positive voltage is applied to base of Q2 so it saturates and cuts off, allowing Q1 to conduct. Output then appears across load with phase reversed.-A. H. Hargrove, Simple Circuits Control Phase-Shift, EDN Magazine, Jan. 1, 1971, p 39.



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