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1. (WO1997019445) ARRANGEMENT COMPRISING A MAGNETIC WRITE HEAD, AND WRITE AMPLIFIER WITH CAPACITIVE FEED-FORWARD COMPENSATION
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1997/019445 International Application No.: PCT/IB1996/001211
Publication Date: 29.05.1997 International Filing Date: 12.11.1996
IPC:
G11B 5/02 (2006.01) ,G11B 5/09 (2006.01) ,H03F 1/14 (2006.01) ,H03F 3/45 (2006.01)
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
02
Recording, reproducing or erasing methods; Read, write or erase circuits therefor
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
02
Recording, reproducing or erasing methods; Read, write or erase circuits therefor
09
Digital recording
H ELECTRICITY
03
BASIC ELECTRONIC CIRCUITRY
F
AMPLIFIERS
1
Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
08
Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements
14
by use of neutralising means
H ELECTRICITY
03
BASIC ELECTRONIC CIRCUITRY
F
AMPLIFIERS
3
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
45
Differential amplifiers
Applicants:
PHILIPS ELECTRONICS N.V. [NL/NL]; Groenewoudseweg 1 NL-5621 BA Eindhoven, NL
PHILIPS NORDEN AB [SE/SE]; Kottbygatan 7 Kista S-164 85 Stockholm, SE (SE)
Inventors:
RAMALHO, Joao, Nuno, Vila, Lobos; NL
DESBONNETS, Eric, Bernard, Marie, François; FR
Agent:
HESSELMANN, Gerardus, J., M.; Internationaal Octrooibureau B.V. P.O. Box 220 NL-5600 AE Eindhoven, NL
Priority Data:
95203187.021.11.1995EP
Title (EN) ARRANGEMENT COMPRISING A MAGNETIC WRITE HEAD, AND WRITE AMPLIFIER WITH CAPACITIVE FEED-FORWARD COMPENSATION
(FR) AGENCEMENT COMPORTANT UNE TETE D'ECRITURE MAGNETIQUE ET AMPLIFICATEUR D'ECRITURE DOTE D'UNE COMPENSATION CAPACITIVE A CORRECTION AVAL
Abstract:
(EN) A write amplifier (4) comprising four current mirrors (14, 22, 30 and 38) which are turned on two at a time by two switchable floating current sources (46, 48) between the input terminals (16, 40; 24, 32) of the current mirrors in order to produce a write current of alternating polarity through the write head (2). The parasitic capacitances across the write head (2) and/or the parasitic capacitances (Cp1, Cp2) of the write amplifier (4) at the write terminals (6, 8) are compensated by means of feed-forward capacitors (170, 172, 174, 176). The high impedance at the terminals (6, 8) of the write head (2) enables the common-mode voltage across the write head (2) to be fixed at any desired voltage value by means of a common-mode circuit.
(FR) Cette invention concerne un amplificateur d'écriture (4) comportant quatre miroirs de courant (14, 22, 30 et 38) qui sont activés par paires, par deux sources (46, 48) commutables de courant à potentiel flottant disposées entre les bornes d'entrée (16, 40;24, 32) desdits miroirs de courant de façon à produire un courant d'écriture de polarité alternée à travers la tête d'écriture (2). On compense les capacités parasites à travers la tête de lecture (2) et/ou les capacités parasites (Cp1, Cp2) de l'amplificateur d'écriture (4) au niveau des bornes d'écriture (6, 8) au moyen de condensateurs à correction aval (170, 172, 174, 176). L'impédance élevée au niveau des bornes (6, 8) de la tête d'écriture (2) rend possible le blocage de la tension en mode commun traversant la tête d'écriture (2) à n'importe quelle valeur de tension souhaitée au moyen d'un circuit en mode commun.
Designated States: CN, JP, KR, SG
European Patent Office (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
SG43638EP0804789JPH10513300 CN1169200KR1019980701539MYPI 96004797