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FINITE IMPULSE RESPONSE ADAPTIVE FILTER
The FIR filter is equipped with 4-tap, 6-bits dual input and 7-bits dual output, designed to fine-tune the PR4 equalization of a Read/Write channel for digital tape. It has a filter coefficient adaptation loop, able to optimize the 6 bits taps coefficients.
FEATURES
- 6 bits signed input, paired( 2 samples per clock)
- 7 bits signed coefficients
- 7 bits signed output, paired ( 2 samples per clock )
- 42 MHz operation in 0.18mm CMOS technology
- 4 taps, 5 coefficients ( middle one fixed )
- independently adapted coefficients using LMS algoritm with error sign and input amplitude
- programmable adaptation rate
- the coefficients can be adapted symetrical or independently
- every coefficient has an enable bit for adaptation
SYSTEM OVERVIEW
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