论文信息 - An eight–order lowpass filter with 5–100 Mhz tuning range and programmable boost

An eight–order lowpass filter with 5–100 Mhz tuning range and programmable boost

An eighth order linear phase continuous time low-pass filter implementing pulse shaping and noise filtering for partial response maximum likelihood (PRML) read channel applications is presented. The filter supports two operation modes: DATA and SERVO. In each mode the cutoff frequency is tunable in a 1 to 3 range for a fixed external reference resistor (a further 1 to 3.3 tuning range is available changing this resistor), the cutoff frequency range in SERVO is an half that in DATA. The amount of boost is programmable in the 6-15dB range for DATA and 3-9dB for SERVO. At the nominal signal swing of 100mVpp differential, the allowed distortion is 1%. The transconductance capacitance (Gm-C) filter is implemented in a 0.35µm 3.3V BiCMOS technology, occupies 0.14mm2and dissipates 46mW at 100MHz.

R. Alini | S. Portaluri | M. Demicheli | G. Bollati | Ricardo Castello

[1] Rinaldo Castello,et al. A 70-mW seventh-order filter with 7-50 MHz cutoff frequency and programmable boost and group delay equalization , 1997 .

[2] G. A. De Veirman,et al. Design of a bipolar 10-MHz programmable continuous-time 0.05 degrees equiripple linear phase filter , 1992 .

[3] N. Rao,et al. A 3V 10-100 MHz continuous-time seventh-order 0.05/spl deg/ equiripple linear-phase filter , 1999, 1999 IEEE International Solid-State Circuits Conference. Digest of Technical Papers. ISSCC. First Edition (Cat. No.99CH36278).