In this memo, we present measurements of the noise of YIG-tuned oscillators (YTOs) at their fundamental frequency and multiplied to millimeter-wave frequencies. Based on these measurements, we verify that the phase noise goals for this component can be met with a 300-kHz bandwidth phase lock loop (PLL) as long as the fundamental YTO frequency is not above 27 GHz. We also present measurements of phase noise added by multipliers and power amplifiers, with the conclusion that their contribution is insignificant. Preliminary W-band amplitude noise measurements using a SIS mixer are also presented, indicating that specifications can be met with this architecture. Phase and amplitude noise measurements are compared to a millimeter-wave Gunn oscillator.
View a PDF version of ALMA Memo #311.
View a PS version of ALMA Memo #311.Last modified: August 28, 2000
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