A 3-V high-bandwidth integrator for magnetic disk read channel continuous-time filtering applications

This paper describes circuit techniques for the implementation of low-voltage CMOS integrators for continuous-time filters. A prototype sixth-order Butterworth lowpass filter with two programmable zeros was designed and developed to demonstrate the proposed techniques. The filter is suitable for magnetic disk read channel applications and achieves a 4.8:1 bandwidth tuning range with a maximum -3 dB bandwidth of 130 MHz. The spurious free dynamic range for an input signal of 300 mV peak-to-peak differential is greater than 40 dB. The prototype filter alone consumes 130 mW from a 3.0 V supply and is implemented in a 0.35 /spl mu/m CMOS technology.