Patent
Apparatus for measuring frequency modulation noise signals and for calibrating same
James R. Ashley,Frank M. Palka +1 more
TLDR
In this article, an auxiliary injection phase-locked oscillator is used to provide a signal of sufficient level for operation of a high-frequency discriminator used for noise measurement, and the auxiliary oscillator may additionally be used for calibration of the discriminator preliminary to taking noise measurements.Abstract:
Apparatus is provided for the measurement of frequency modulation noise on the carrier signal output of a low-noise, low-power, high-frequency diode oscillator under test. An auxiliary injection phase-locked oscillator, driven by the oscillator under test, is used to provide a signal of sufficient level for operation of a high-frequency discriminator used for noise measurement. The auxiliary oscillator may additionally be used for calibration of the discriminator preliminary to taking noise measurements.read more
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Patent
Optimum length transmission line discriminator with low noise detector
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Patent
Apparatus for measuring frequency modulation noise signals having a frequency response compensation circuit
James R. Ashley,Frank M. Palka +1 more
TL;DR: A microwave bridge circuit for measuring frequency modulation noise signals arising in low power, high frequency sources having a highly nonconstant FM noise versus baseband frequency characteristic includes amplifying and filtering means for excluding signals in frequency ranges beyond the field of interest and frequency response compensator means of attenuating signals outside the primary range of interest as discussed by the authors.