Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1989-03-06
1990-11-06
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307262, 328109, 328155, 328 55, G06G 700, H03K 500
Patent
active
049689088
ABSTRACT:
A phase modulator for use in a two-oscillator phase noise measurement system is placed in the line from either the reference oscillator or the device under test. The phase modulator couples a small portion of the input signal to an amplitude modulator and phase shifter to shift the small signal by exactly 90 degrees. The small signal portion is then coupled back into the input signal such that small variations in the coupled signal result in phase modulation and not amplitude modulation which would undermine the calibration of the instrument. The phase modulator described can also be used with known devices of many types to correct the added phase noise of components, e.g., power amplifiers.
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F. L. Walls et al., "Extending the Range and Accuracy of Phase Noise Measments", Proceedings of the Symposium on Frequency Control, Jun. 1988.
Al. L. Lance et al., Infrared and Millimeter Waves, vol. II, pp. 239-289, Chapter 7.
Becker Stephen A.
Englert Alvin J.
Miller Stanley D.
Roseen Richard
The United States of America as represented by the Secretary of
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