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:
Apr. 07, 1992
Filed:
Sep. 17, 1990
Michael McGinn, Scottsdale, AZ (US);
Motorola, inc., Schaumburg, IL (US);
Abstract
A phase detector is implemented with NPN transistors for providing a symmetrical push-pull output current operating in response to the phase difference between the falling edge of an oscillator signal and the mid-pulse of a sync signal. A current sinking circuit is responsive to the first and second input signals for providing a first current of predetermined magnitude and for sinking a second current of predetermined magnitude from the output of the phase detector. An NPN transistor current mirror circuit has an input responsive to the first current provided by the current sinking circuit and an output for sourcing a third current into the output of the phase detector, while a voltage equalizing circuit establishes substantially equal potentials at the input and output of the current mirror for maintaining proportional input and output current thereof.