Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of the amplifier
Patent
1990-03-19
1992-12-01
Severin, David J.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of the amplifier
360 65, G11B 502, G11B 1514
Patent
active
051683970
ABSTRACT:
A magnetic reproducing head amplifier includes a differential amplifier referred to as one of these three types: a balanced input type, a balanced output type, or a balanced input/output type. The amplifier has at least one positive feedback circuit for passing a positive feedback current to the differential amplifier, and at least one negative feedback circuits for passing a negative feedback current to the differential amplifier and is configured so that a positive feedback and a negative feedback are simultaneously performed by the positive feedback circuit as well as the negative feedback circuit. A resonance peak characteristic at the input part of the differential amplifier is dumped by the negative feedback current, and therefore a frequency characteristic as well as a group delay characteristic of the output of the differential amplifier becomes flattened. Moreover, the use of the positive feedback current from the positive feedback circuit permits the charging current from the signal source to the input capacitance of the differential amplifier to be reduced, that is to say, an effective input capacitance is reduced, and thereby a resonance frequency at the input part of the differential amplifier can be shifted to the vicinity of the upper limit of the transmission band. Consequently, a stable amplification operation can be achieved for FM carriers for carrying wide frequency signals, such as HDTV signals.
REFERENCES:
patent: 3747007 (1973-07-01), Geitner
patent: 4437069 (1984-03-01), Kleinberg
patent: 4547819 (1985-10-01), Meitner et al.
patent: 4956729 (1990-09-01), Yatsugi et al.
Elecktronik, H. 12, Jun. 13, 1986, Munchen, DE, "Hybridverstarker treibt 50 gamma-Lasten im Videobereich".
Itsumi Tadashi
Iwamura Soichi
Takakura Eiichi
Severin David J.
Sharp Kabushiki Kaisha
LandOfFree
Magnetic reproducing head amplifier does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Magnetic reproducing head amplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic reproducing head amplifier will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-506478