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. 11, 1984
Filed:
Jun. 02, 1981
William A Severin, Houston, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
An integrated circuit demodulator receives an alternating signal at a first frequency and an alternating signal at a second frequency and provides a binary output corresponding to the first and second frequencies. An input signal is received by a first and a second frequency filter. If the input signal is the first frequency, then it is attenuated in the second frequency filter and vice versa. A positive full wave rectifier receives the first frequency signal and provides a positive full wave rectification thereof. A negative full wave rectifier receives the second frequency signal and provides a negative full wave rectification thereof. The rectifications are summed in an operational amplifier, thereby providing a difference so that the positive rectification is reduced by the attenuated negative rectification and the negative rectification is reduced by the attenuated positive rectification. A binary output is thereby provided.