Low-voltage current-mode analogue continuous-time filters

摘要

A novel current-mode analogue continuous-time filter synthesis technique is proposed based on a transformed set of state-equations, that allow the utilization of only current-mode linear lossy-integrators implemented using standard current mirrors; also a novel current-mode gyrator is introduced. The technique has been successfully used for synthesizing low-voltage 5th order lowpass, highpass, bandpass and stopband Chebyshev filters from passive doubly loaded ladder prototypes. SPICE simulations using CMOS standard process level 2 parameters have shown these filters perform well, exhibiting a THD less than 1