A stable low-level oscillator with cryogenic applications

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Abstract
Some general factors affecting the stability of low-level oscillators are considered and a design is given for an active circuit to drive a low Q tank circuit with a dissipation below 10-9 W. The circuit is insensitive to supply voltage variations, and contributes less than 1 part per million per degree, to the drift in frequency with temperature. The results of tests of its performance driving a magnetic thermometer used below 1K are described.