The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 22, 1989
Filed:
Jan. 30, 1986
Toshio Tamamura, Tokyo, JP;
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A measurement circuit includes two signal sources, one for generating a test input signal to a DUT and the other for generating a sampling signal. Both sources are coupled to one crystal oscillator and one or both sources may be fractional N oscillators. A phase locked loop stabilizes the sampling signal generated by the fractional N oscillator. The test input signal and the output signal from the DUT are separately mixed with the sampling signal and the resulting sampled signal are converted to digital values by A/D converters and stored in a microprocessor. The stored values can later be compared and analyzed by the microprocessor to determine the characteristics of the DUT.