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This method allows AC coupling without sacrificing any transient response performance, and is used in the read data path of a direct access disk drive.
English (United States)
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Integrated Bicmos Amplifier Coupling Scheme
This method allows AC coupling without sacrificing any transient response
performance, and is used in the read data path of a direct access disk drive.
The majority of the data channel was resident on an ACMOS module capable
of being powered from up to a 5-volt supply. The ACMOS module was required
to amplify and filter the disk read signal coming from a head pre-amp powered
from a 12-volt supply. The pre-amp signal output voltage was a few millivolts
peak-to-peak on top of a few hundred DC millivolt offset. The ACMOS module
had to AGC the AC signal up to 1 vp-p and active-filter it. The active filter
contained a number of amplifiers interconnected by filter sections. The filters
were both single-ended and differential and introduced a significant DC
component to the AC signal. The large AC signal amplitude that was needed,
compared to the small power supply voltage (this function was previously done
with a 12-volt supply), dictated some form of AC coupling to remove the variable
DC offset, level translate, and recover the center of a single-ended AC waveform.
The figure shows a schematic of the front end section of the AGC in the
ACMOS module. The AC coupling capacitors are placed in series with the FBO
and FDO differential inputs. The resistors that form the other end of the high pass
filter are R1 and R2. FVO is a chip reference voltage that the resistors DC center
to. This voltage can be whatever the optimum level o...