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:
Nov. 02, 1999
Filed:
Jan. 23, 1998
Hidekazu Shibasaki, Higashine, JP;
Hiroaki Ueno, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A signal reproducing circuit includes a magneto-resistive effect head having one end thereof coupled to a first power supply line, for reproducing data recorded on a magnetic recording medium in a read operation. A first constant current source is coupled between another end of the head and a second power supply line, for supplying the head with a sense current in the read operation. First and second transistors have collectors thereof coupled to the first power supply line, and are responsive to voltage signals obtained from both ends of the head, respectively. Second and third constant current sources are coupled between each emitter of the first and second transistors and the second power supply line, respectively, for supplying the first and second transistors with a predetermined constant current in the read operation. A capacitor is connected between each emitter of the first and second transistors. A control circuit responsive to a read/write control signal controls respective ON/OFF timings of the first to third constant current sources. The control means controls at least one signal reproducing circuit portion corresponding to nonselected heads to be brought to a read state when a signal reproducing circuit portion corresponding to a selected head is in a write state.