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:
Dec. 04, 2012
Filed:
Feb. 09, 2011
Kenneth Mulvaney, Cork, IE;
Kenneth Mulvaney, Cork, IE;
Analog Devices, Inc., Norwood, MA (US);
Abstract
Apparatus and methods for demodulation are provided. In one embodiment, a method includes receiving an input signal having a frequency that varies in relation to a state of the signal, calculating a sine and cosine of a phase control signal, generating a first signal proportional to the sine of a product of a first quantity and the frequency of the input signal, generating a second signal proportional to the cosine of a product of the first quantity and the frequency of the input signal, and summing a product of the first signal and the cosine of the phase control signal with a product of the second signal and the sine of the phase control signal to generate a demodulator output for resolving the state of the input signal. In certain implementations, the phase control signal is controlled so as to reduce a frequency error of the input signal.