This paper describes the magnetic recording characteristics and a front-end circuit of R-DAT. Some equivalent models are constructed to simulate these characteristics. Head amplifiers and the equalizers which comprise three taps transversal filter are optimized according to the results of the simulations. The optimized characteristics are realized in two ICVs. One IC is AN7020S, which includes head amplifiers, recording amplifiers, and equalizers. Another is AN7021S which includes a high-speed comparator and envelope detectors.
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