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. 21, 2004
Filed:
Dec. 21, 2000
William Eric Main, Mesa, AZ (US);
Danielle L. Coffing, Tempe, AZ (US);
Freescale Semiconductor, Inc., Austin, TX (US);
Abstract
A demodulator circuit ( ) having harmonic cancelling receives an input signal (IF) and generates an oscillator signal (OSC) in an oscillator circuit ( ). The oscillator signal (OSC) is locked to the same frequency and phase as the input signal (IF). A phase shift circuit ( ) generates a shifted signal (OSC SHIFTED) that is in quadrature with the oscillator signal (OSC). A multiplier ( ) receives the oscillator signal (OSC) and the shifted signal (OSC SHIFTED) and generates an output signal ( IF) having twice the frequency of the oscillator signal (OSC). A multiplier circuit ( ) also receives the input signal (IF) and along with the oscillator signal (OSC) generates an output signal (PD). The signals generated by the multiplier ( ) and the multiplier circuit ( ) are summed in a summing circuit ( ) that supplies an output signal (OUT).