Reduction of intermodulation
AssigneeHarris Corporation
InventorsJing Jong Pan, Milton Phillip Arnold
Life of this patent
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Abstract
A low distortion modulated light source, including a light emitting diode and a compensating diode. These diodes are arranged in parallel for D.C. biasing, and in anti-series with respect to the A.C. signal path. Means are provided for varying the relative biasing of the two devices so as to thereby adjust the A.C. characteristics of the compensating diode to more accurately correspond to the A.C. characteristics of the light emitting diode. When properly biased, the inherently non-linear junction capacitance of the light emitting diode is compensated so as to substantially eliminate undesired harmonics and intermodulation products.
Claims7
A low distortion opto-electronic light source for use with a signal source generating an A.C. signal and comprising,
- semiconductor light source means,
- compensating means having a voltage dependent capacitance characteristic substantially similar to that of said light source means,
- biasing means for applying a biasing current through said light source means and said compensating means, and
- connecting means for connecting said light source means and said compensating means in anti-series across said signal source and in parallel across said biasing means.
Dependencies are inferred from the claim text.