G - Physics – 06 – K
Patent
G - Physics
06
K
G06K 7/08 (2006.01)
Patent
CA 2211129
A read/write head circuit that insures the equivalence between the driving signal frequency and the ressonance of the tank made up of an inductive sensor in parallel with a capcitor. The invention makes use of a voltage controlled oscillator (38) - VCO - to generate synchronism pulses (54) from the driving current generator (33), the controlling voltage being obtained from the comparison between the driving current and voltage phases through the ressonant tank made up of the sensor (11) and capacitor (17) connected in parallel. The circuit further provides an amplitude limitation of the driving signal through the control of the driving current pulses applied to the inductive sensor.
Circuit de tête de lecture/écriture assurant l'équivalence entre la fréquence d'un signal d'attaque et la résonance d'un circuit à résonance composé d'un capteur inductif raccordé en parallèle à un condensateur. On utilise un oscillateur commandé en tension (38) (VCO) pour engendrer des impulsions de synchronisation (54) à partir du générateur (33) de courant d'attaque, la tension de commande étant obtenue par comparaison des phases de la tension et du courant d'attaque au travers du circuit à résonance composé du capteur (11) et du condensateur (17) raccordés en parallèle. Ce circuit assure également une limitation de l'amplitude du signal d'attaque par régulation des impulsions du courant d'attaque appliquées au capteur inductif.
Augusto Miranda Dos Santos Pato Manuel
Capeli Antenor Jr.
Ricardo Clayton Felipe
Sabattini Narcizo Jr.
Fundacao Cpqd - Centro de Pesquisa E. Desenvolvimento Em Telecom
Gowling Lafleur Henderson Llp
Telecomunicacoes Brasileiras S/a - Telebras
Telecomunicacoes Brasileiras S/a-Telebras
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