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:
Nov. 26, 1991
Filed:
Jun. 18, 1990
Eric W Strid, Portland, OR (US);
Bernard W Leake, Beaverton, OR (US);
Cascade Microtech, Inc., Beaverton, OR (US);
Abstract
A one port tuner having a source port for connection to a device under test so that, in combination with a noise meter, the noise performance of such device can be evaluated. Preferably the one port tuner includes a plurality of predetermined admittances, a switching device having an output port for selectively connecting one of the admittances to the output port, and a two port device having a selectable response and interconnected between the output port of the switching device and the source port of the one port tuner. Desirably, the two port device includes a multiple-state attenuator where the signal passing through the attenuator is selectable in degree. Alternatively, or in combination, the two port device includes a phase shifter where the phase of the signals passing through the phase shifter are selectively shiftable. Optionally, the one port tuner includes a variable amplifier, variable phase shifter, and variable bandpass filter in serial connection with each other where the two legs of the serial connection are coupled to the source port by a signal feedthrough device.