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:
Sep. 26, 1989
Filed:
Jun. 03, 1988
Michael McGinn, Scottsdale, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A detection circuit for providing an error signal corresponding to the phase difference between applied input signals is described comprising a balanced multiplier input section for receiving the input signals and having a pair of outputs; a first switching circuit responsive to a switching signal for commutating the outputs of the multiplier section between first and second circuit nodes; a current turnaround circuit coupled between the first and second circuit nodes and third and fourth circuit nodes, a second switching circuit responsive to the switching signal for alternately coupling the third and fourth circuit nodes to a fifth circuit node and an output of the detection circuit; a current mirror circuit having first and second terminals and a third switching circuit responsive to the switching signal for alternately coupling the first and second terminals of the current mirror circuit to the fifth circuit node and the output of the detection circuit.