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Single Sideband Signal Generation

June 11th Fact-of-the-Day

A common method of generating a single-sideband (SSB) signal is to split an incoming audio intelligence signal into two signals that are identical, except for a 90-degree phase difference, and to split a constant amplitude and frequency carrier signal into two carrier signals that also have a 90-degree phase difference. The resulting four signals are applied to two balanced-modulators such that each balanced-modulator receives one audio-phase and one carrier-phase signal. The output of each balanced-modulator is a double-sideband signal. However, there is no phase difference between one of the sidebands in the two modulator outputs, but there is a 180-degree phase difference between the other sideband in the two outputs. The two balanced modulator outputs are summed, which cancels one sideband and doubles the strength of the other, resulting in a single-sideband signal. ©2005 Martek, International. All rights reserved.

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