Voltage amplifier for constant voltage biasing and amplifying si

Details Voltage amplifier for constant voltage biasing and amplifying si Voltage amplifier for constant voltage biasing and amplifying si

1986-06-30

1988-11-22

Cardillo, Raymond F.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

360113, G11B 502, G11B 5127

Patent

active

047869933

ABSTRACT:
An amplifier for voltage biasing and amplifying the signals produced by a magnetic sensor is provided. Electrically, the resistance of the sensor is disposed between the bases of a differential pair comprising the input stage of the amplifier. Constant bias voltage for the sensor is provided independently of sensor resistance. DC feedback to the input stage balances current flow in both paths of the differential input stage to correct for DC offset arising in the output from input stage emitter resistor. The amplified signal, representing .DELTA.R.sub.h /R.sub.h, is sensed as a voltage across the magnetoresistive sensor, where .DELTA.R.sub.h is the change in steady-state resistance, R.sub.h, of the sensor.

REFERENCES:
patent: 3979775 (1976-09-01), Schwarz
patent: 4050086 (1977-09-01), Harr
patent: 4191977 (1980-03-01), Lewkowicz
patent: 4677380 (1987-06-01), Popovic et al.
patent: 4691259 (1987-09-01), Imakoshi et al.
patent: 4694248 (1987-09-01), Kordi et al.
patent: 4706138 (1987-11-01), Jove et al.

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