Rajeev Badyal

A CMOS analog adaptive equalizer for a DDSS tape drive PRML read channel

A fully analog approach to an adaptive equalizer is designed in 1.0 /spl mu/m CMOS. The 13 tap FIR filter is a key component of a PRML read/write channel mixed signal IC for digital audio tape (DAT) format tape drives. A variety of continuous time, current mode, switched capacitor, and offset cancellation techniques are used to achieve desired performance.

VLSI implementation of adaptive bit/serial IIR filters

A new structure for the VLSI implementation of a bit/serial adaptive IIR filter is presented. The system is built at a bit level consisting of only gated full adders. This approach allows recursive operation of the IIR filter to be implemented with minimal delay time and chip area. The coefficients of the filter can be updated in real time for the time invariant and adaptive filtering. The fourth-order filter is implemented on a 2- mu m CMOS technology clocked at 50 MHz.<<ETX>>