A CMOS 750MHz Fifth-Order Continuous-Time Linear Phase Lowpass Filter with Gain Boost

摘要

The design and implementation of a CMOS continuous-time multiple loop feedback (MLF) leap frog (LF) filter is described. The filter is implemented using a fully-differential linear, low voltage operational transconductance amplifier (OTA). PSpice simulations using a standard TSMC 0.18(mu)m CMOS process with 1.8V power supply have shown that the cut-off frequency of the filter ranges from 455MHz to 780MHz and dynamic range is about 58dB. The group delay is less than 5percent over the whole tuning range; the maximum power consumption of the filter with gain boost is only 240mW.