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The circuit shown above provides improved signal enhancement for the output from a magnetoresistive read head.
English (United States)
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Wave Shaping Circuit for a Magnetoresistive Read Head
The circuit shown above provides improved signal enhancement for the
output from a magnetoresistive read head.
The circuit comprises a magnetoresistive read head 1, supplied with a bias
current from a quasi-constant bias voltage source including operational amplifier
3 and the associated circuit elements. The signals from head 1 are passed by a
capacitor 5 to one input of amplifier 7, and the output therefrom is supplied to one
input of amplifier 9. The output from amplifier 9 is then supplied to additional
circuitry (not shown) for further processing and analysis.
Two feedback paths are provided for amplifier 9. A negative feedback path
including a first diode 11 and a parallel resistor 13 clips the upper portion of the
signal from amplifier 7. This portion of the signal contains noise resulting from
the Barkhausen effect, and this feedback reduces the noise caused thereby.
A positive feedback circuit includes a second diode 15 in series with a
resistor 17. This feedback enhances the lower portion of the signal which is
utilized for flux line detection.
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