Fujitsu MHY2040BH, Product/Maintenance Manual, Page: 69 / 322

4.6 Read/write Circuit
C141-E262 4-11
4.6.3 Read circuit
The head read signal from the PreAMP is regulated by the automatic gain control
(AGC) circuit. Then the output is converted into the sampled read data pulse by
the programmable filter circuit and the flash digitizer circuit. This signal is
converted into the read data by the decorder circuit based on the read data
maximum-likelihood-detected by the Viterbi detection circuit.
(1) AGC circuit
The AGC circuit automatically regulates the output amplitude to a constant value
even when the input amplitude level fluctuates. The AGC amplifier output is
maintained at a constant level even when the head output fluctuates due to the
head characteristics or outer/inner head positions.
(2) Programmable filter circuit
The programmable filter circuit has a low-pass filter function that eliminates
unnecessary high frequency noise component and a high frequency boost-up
function that equalizes the waveform of the read signal.
Cut-off frequency of the low-pass filter and boost-up gain are controlled from the
register in read channel block. The MPU optimizes the cut-off frequency and
boost-up gain according to the transfer frequency of each zone.
Figure 4.5 shows the frequency characteristic sample of the programmable filter.
Figure 4.5 Frequency characteristic of programmable filter
-3 dB