Circuit for controlling the overall upper cutoff frequency of an

Details Circuit for controlling the overall upper cutoff frequency of an Circuit for controlling the overall upper cutoff frequency of an

1993-07-22

1995-02-14

Hajec, Donald

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 67, G11B 509

Patent

active

053900537

ABSTRACT:
The circuit according to the invention comprises a circuit for receiving an input signal, the amplitude of which is proportional to the frequency of input signal; amplifier for providing an amplified output signal; bandwidth tracking located between input circuit and amplifier and defining a low-pass filtering stage and a voltage divider network, bandwidth tracking being controlled by servo in response to the output of amplifier, so that the upper cutoff frequency of low-pass filtering stage varies in a proportionate manner with the frequency of input signal and so that the amplitude of amplified output signal remains substantially constant.

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