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Adding DC Offsets to a Function Generator’s Output

Adding DC Offsets to a Function Generator’s Output

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A variety of electronic test applications require you to add a DC offset to a function generator’s output. The result is a signal that is a waveform superimposed on top of a DC voltage. For example, you can use a sine wave added on top of a DC bias voltage for testing a circuit’s immunity to noise that appears on its real bias voltages. For amplifier testing, you can bias a transistor with DC that has an AC component riding on top of it. Even a repetitive series of unipolar pulses (used for driving a FET gate signal for DC/DC converters) are thought of as a pulse train with a DC offset. All of these applications need a DC plus AC signal, all with different voltage, current, and waveform bandwidth requirements.

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