April 30, 1998
The conventional approach to generating local oscillator (LO) power for millimeter- and submillimeter-wave heterodyne mixers is to generate power at a lower frequency using a suitable phase-locked source, and to convert this power to the desired commensurate frequency using a nonlinear diode such as a varactor in a frequency multiplier circuit. Although useful for single-dish telescope receiver systems, the conventional approach, using current state-of- the-art components, is highly impractical for large array-type radio telescopes for which manageable cost and high reliability are important factors.
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