Method and device for determining sideband ratio of superconduction mixer using comb generator
AssigneeJapan Science and Technology Agency
InventorYasuo Fukui
Life of this patent
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Abstract
The present invention provides a method and device for determining the sideband ratio of a superconducting mixer using a comb generator. The method includes the steps of: (a) tentatively adjusting the sideband ratio of a mixer for calibration of an output of the comb generator; (b) determining the signal intensity of a pseudo-celestial signal oscillator for calibration of the output of the comb generator; (c) repeating the steps (a) and (b) to derive the relation between the sideband radio of the mixer for the comb-generator output calibration and the intensity of a pseudo-celestial signal; (d) calibrating the output of the comb generator; and (e) obtaining the sideband ratio of the mixer to be measured.
Claims8
A method for determining the sideband ratio of a superconducting mixer using a comb generator, the method comprising the steps of:
- (a) tentatively adjusting the sideband ratio of a mixer for calibration of an output of the comb generator;
- (b) determining the signal intensity of a pseudo-celestial signal oscillator for calibration of the output of the comb generator;
- (c) repeating the steps (a) and (b) to derive the relation between the sideband radio of the mixer for the comb-generator output calibration and the intensity of the pseudo-celestial signal;
- (d) calibrating the output of the comb generator;
- and
- (e) obtaining the sideband ratio of the mixer to be measured.
A device for determining the sideband ratio of a superconducting mixer using a comb generator, the device comprising:
- (a) a signal oscillation unit comprising a comb-generator reference signal oscillator, the comb generator, a pseudo-celestial signal oscillator for calibration of an output of the comb generator, and a local oscillator;
- (b) a Dewar vessel having superconducting mixers to be measured and a superconducting mixer for calibration of the output of the comb generator;
- (c) a temperature calibration unit;
- (d) a spectrum analyzer connected to an output section of the Dewar vessel;
- and
- (e) an electronic controller connected to the signal oscillation unit, the Dewar vessel, the temperature calibration unit, and the spectrum analyzer, wherein
- (f) an output signal of the comb generator is supplied to the Dewar vessel to obtain the sideband ratio of each superconducting mixer to be measured.
Dependencies are inferred from the claim text.