Low noise preamplifier

Details Low noise preamplifier Low noise preamplifier

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.

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