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:
Oct. 12, 1993
Filed:
Aug. 22, 1991
William H Davenport, Hillsboro, OR (US);
Gary D McCormack, Aloha, OR (US);
TriQuint Semiconductor, Inc., Beaverton, OR (US);
Abstract
An integrating phase detector includes a phase comparator and an integrating load impedance. The phase comparator is a voltage-input, current-output logic gate such as a OR/NOR gate, or a XOR/XNOR gate having first and second inputs for comparing the phase of first and second input signals. The current output of the logic gate provides an output current pulse proportional to the phase difference between the first and second input signals. The integrating load such as a passive resistor-capacitor network is coupled to the current output of the phase detector for directly integrating the current pulse and providing a DC voltage proportional to the phase difference between the first and second input signals. The minimum pulse width of the output current pulse is substantially limited only by the fT of the devices used in the logic gate. The improved bandwidth of the phase detector also increases the linear operating range by increasing the range of phase in which the output current pulse is proportional to the input phase difference.