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. 07, 1999
Filed:
Dec. 18, 1997
Claude Andrew Sharpe, McKinney, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A demodulator (200) including a phase detector (201) receiving a modulated signal and outputting a demodulated signal. The phase detector (201) also receives a reference signal. A programmable voltage circuit (203, 204) outputs an analog voltage. A reference signal generator (208) that is responsive to the programmable voltage circuit (204) and the demodulated signal has an output coupled to provide the reference signal to the phase detector (201). A window detect circuit (206) with an input coupled to the demodulated signal generates an inhibit signal when the demodulated signal is within preselected limits. The inhibit signal is coupled to latch the programmable voltage circuit (203, 204). Preferably, the programmable voltage circuit is implemented as a digital-to-analog converter (204) driven by a counter (203) or by a processor circuit (302).