100_MODULATION_OF_DIGITAL_SIGNALS

Published:2009/7/6 23:02:00 Author:May | From:SeekIC

Developed to produce positive-going half-sine envelope modulated 100% by digital RF signal. Modulator uses loop gain of opamp to reduce diode drops very nearly to ideal zero level. D2, prevents opamp output terminal from swinging more negative than diode drop of 0.3V, which is not apparent at output. RF input amplitude must be sufficient to provide 100% modulation; this can be achieved by providing about 20% overdrive to give safety factor. Use hot-carrier diodes such as HP-2800 series.-D. L. Quick, Improve Amplitude Modulation of Fast Digital Signals, EDN Magazine, Sept. 20, 1975, p 68 and 70.



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