Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Patent
1993-05-26
1994-01-25
Hajec, Donald
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
360 67, G11B 509, G11B 502
Patent
active
052820947
ABSTRACT:
A base current compensation circuit is configured for connection to a first current mirror that has lost base current. The compensation circuit includes a compensation mirror coupled in a feedback loop to the first current mirror. A current sensing transistor senses the lost base current. A current duplicating mirror is coupled to the current sensing transistor and generates a compensation current in response to the sensed lost base current. The compensation current is fed back into the first current mirror to compensate for the lost base current. A voltage clamp is coupled to the current sensing transistor and the current duplicating transistor. The voltage clamp maintains approximately equal collector-base voltages in the current sensing transistor and the current duplicating transistor to increase accuracy of the compensation mirror.
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Hajec Donald
VTC Inc.
Wamsley Patrick
LandOfFree
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