A 3 V-50 MHz analog CMOS current-mode high frequency filter with a negative resistance load

Abstract

A low voltage analog CMOS current-mode continuous-time high frequency filter with a negative resistance load (NRL) is proposed. To design a current integrator, we use a modified simple current mirror with a NRL to increase the output resistance. The current integrator is designed to have the frequency behavior enhancement and operate in low voltage by employing a simple mirror structure and diode connected input transistor. The third order Butterworth low pass filter using a current integrator is synthesized and simulated with a 1.5 /spl mu/m n-well process. Simulation result shows cutoff frequency of 50 MHz and power consumption of 2.4 mW/pole with a 3 V power supply.