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:
Jun. 18, 2002
Filed:
Jun. 30, 2000
Michel Burri, Grand-Saconnex, CH;
Christophe Landez, Toulouse, FR;
Motorola, Inc., Schaumburg, IL (US);
Abstract
In accordance with an embodiment of the invention there is provided a sample and hold demodulator circuit ( ) for use in an automotive immobilizer to recover modulation information from a received modulated carrier signal (V ). Sample and hold circuitry samples signals to recover the modulation information therein, and control circuitry ( ) is coupled to the sample and hold circuitry for controlling operation thereof. The control circuitry includes shift register circuitry ( ) for receiving a second received signal having a same frequency as a carrier frequency of the received modulated carrier signal and for producing at its outputs signals (SAMPLE, SAMPLE , LATCH) for controlling operation of the sample and hold circuitry. The sample and hold demodulator circuit provides a single IC solution, allowing amplitude and phase demodulation to be performed with a single sample and hold circuit.