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Amplifier for alternating signal overlapped on continuous signals and its amplifying method

A technology of amplifiers and signals, applied in the direction of DC-coupled DC amplifiers, amplifiers, differential amplifiers, etc., can solve problems such as insufficient measurement

Inactive Publication Date: 2007-02-28
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this measurement is considered insufficient

Method used

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  • Amplifier for alternating signal overlapped on continuous signals and its amplifying method
  • Amplifier for alternating signal overlapped on continuous signals and its amplifying method
  • Amplifier for alternating signal overlapped on continuous signals and its amplifying method

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Embodiment Construction

[0016] In FIG. 1 , the amplifier is denoted by reference numeral 1 . In the context of the example, this amplifier is an amplifier for a magnetoresistive resistor 10 which, in the context of the embodiment, is used to read an ordinary hard disk in a personal computer of the PC type (not shown). ). This amplifier comprises an amplifier part 12 of the OTA type, that is to say the amplifier receives a voltage at its inputs 14 and 15 and supplies currents at its outputs 17 and 18 in phase opposite. Amplifier block 12 incorporates a specific transfer function for which the present invention is to be implemented.

[0017] The amplifier 1 comprises two transistors 20 and 21 , the bases of which are supplied with currents of opposite phase from the outputs 17 and 18 . The emitters of these transistors 20 and 21 are connected to both ends of the magnetoresistive resistor 10 , while their collectors are connected to the input terminals 14 and 15 . In addition, the emitters of transis...

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PUM

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Abstract

This amplifier is intended for amplifying variable signals superimposed on a continuous signal. This continuous signal serves in particular for biasing a component, a magnetoresistive resistor used as a hard disk reading head. To avoid the harmful effects of a sudden fluctuation in the continuous signal, this amplifier comprises a set of switchable reactive elements (70) for acting on said transfer function and a bias drift compensation circuit (80) for controlling the switching of said switchable elements with a view to anticipating the effects of said fluctuation.

Description

technical field [0001] The invention relates to an amplifier for a variable signal superimposed on a continuous signal, in particular for biasing a component, comprising a feedback loop whose characteristics are defined by an open-loop transfer function. [0002] The invention also relates to a method of amplifying such a signal. [0003] The invention has important application especially in the aspect of amplifying the signal provided by the magnetoresistive magnetic head of the computer hard disk. Background technique [0004] Such an amplifier is known from patent document US5559646. Although satisfied, it has proven necessary to increase the speed of response to changes in successive sections, for example, switching or vibrations of the magnetic head where particles are likely to deposit on the magnetic track. These vibrations can lead to a sudden increase in temperature, making changes in the continuity section faster. These changes will increase the voltage deviatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F21/00G11B5/02G11B5/027G11B5/03H03F1/02H03F1/14H03F3/34H03F3/45H03F99/00H03G3/12
CPCG11B5/02H03F3/45928G11B2005/0016
Inventor T·特利尔L·吉劳德J·N·拉马尔霍
Owner KONINK PHILIPS ELECTRONICS NV