Amplifiers – With semiconductor amplifying device – Including signal feedback means
Patent
1997-10-02
2000-04-25
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including signal feedback means
330310, H03F 114
Patent
active
060549017
ABSTRACT:
A low-noise wide band preamplifier (10) provides an output voltage signal (V.sub.O) corresponding to the variation in resistance of a sensor such as Magneto-resistive (MR) head (4) which is used to read the data stored on a magnetic media. In this preamplifier, a transistor (12) and resistor (13) combination is used to function as a transimpedance amplifier (11) to increase the frequency bandwidth of the preamplifier and reduce the noise. The transimpedance amplifier (11) takes its input from an input transistor (3) coupled between the MR head (4) and a current source (2). A biasing circuit formed by a transconductance amplifier (12) and a capacitor (5) is used to control the input transistor (3) so that the average current passing through the input transistor (3) matches the current provided by the current source (2).
REFERENCES:
patent: 4061959 (1977-12-01), Ahmed
patent: 4216435 (1980-08-01), Ahmed
patent: 4775842 (1988-10-01), Rumreich
patent: 4851786 (1989-07-01), Vinn et al.
patent: 5122915 (1992-06-01), Klein et al.
Hon Yau Kin Joseph
Lunn Gerald
Nainar Elangovan
Choe Henry
Dover Rennie W.
Motorola Inc.
Pascal Robert
LandOfFree
Low noise preamplifier does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Low noise preamplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low noise preamplifier will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-996575