Title :
A CMOS adaptive continuous-time forward equalizer, LPF, and RAM-DFE for magnetic recording
Author :
Brown, James E C ; Hurst, Paul J. ; Rothenberg, Bret C. ; Lewis, Stephen H.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Davis, CA, USA
fDate :
2/1/1999 12:00:00 AM
Abstract :
A continuous-time forward equalizer with one adaptive zero and a seventh-order linear-phase low-pass filter are described. The forward equalizer cancels precursor intersymbol interference (ISI). A mixed-signal four-tap RAM decision-feedback equalizer (DFE) is also included on the prototype to cancel the postcursor ISI. Both precursor and postcursor ISI are canceled in the analog domain. The adaption is done digitally. The low-pass filter and forward equalizer together occupy 6.7 mm2 in a 1 μm CMOS process. They dissipate 280 mW from a 5 V supply when operating at 80 Mb/s. Including the RAM-DFE, the entire chip occupies 11.2 mm2 and dissipates 630 mW
Keywords :
CMOS integrated circuits; adaptive equalisers; continuous time filters; decision feedback equalisers; digital magnetic recording; interference suppression; intersymbol interference; linear phase filters; low-pass filters; mixed analogue-digital integrated circuits; random-access storage; table lookup; 1 micron; 280 mW; 5 V; 630 mW; 80 Mbit/s; CMOS ASIC; LPF; RAM decision-feedback equalizer; active filter; adaptive equalizer; continuous-time forward equalizer; intersymbol interference; linear-phase low-pass filter; magnetic recording; mixed signal read channel; mixed-signal four-tap RAM DFE; precursor ISI cancellation; seventh-order low-pass filter; Adaptive equalizers; Adaptive filters; Decision feedback equalizers; Detectors; Finite impulse response filter; Intersymbol interference; Low pass filters; Magnetic recording; Noise reduction; Sampling methods;
Journal_Title :
Solid-State Circuits, IEEE Journal of
