A 3V 1 MHz dynamically biased 100ppm/K temperature-stabilized CMOS continuous-time elliptical low-pass filter

A low voltage low power current-mode continuous-time elliptical low-pass filter is presented. This filter uses a current-integrator constructed of a multi-output linearized transconductance element driven by a balanced transimpedance amplifier. A 1 MHz third order elliptic low pass filter is designed with the proposed currentmode integrator. The filter measurements show capability of operation with down to a 3V supply voltage. The measured current consumption is 850 ¿A at room temperature and the dynamic range is 71 dB. The distortion of the filter is below 50 dBc with peak signal levels up to twice the quiescent current level. The filter uses a CMOS-current reference for temperature and process variation stabilization with a measured corner frequency temperature coefficient of-100ppm/K.