An analog CMOS low-pass Active-Gm-RC biquadratic cell is presented. The cell combines the advantage of GM-C filters (no parasitic poles) with the advantages of Active-RC filter (large linear range). Two additional digital-based circuits allow to control the pole frequency and to reduce the effects of the non-dominant poles. A 4th order low-pass Butterworth filter with a 2.11 MHz cut-off frequency and a DC-gain of 32 dB for UMTS receiver has been designed in a 0.18 mu m CMOS technology with 1.8 V supply voltage. The filter exhibits a -93 dBV input-referred noise with a power consumption of 2.16 mW while the linearity performances corresponds to an in-band IIP3 of 4 dBm and an out-of-band IIP3 of 35 dBm. An Active Gm-RC band-pass cell is presented as possible alternative application
D'Amico, S., Baschirotto, A. (2005). Active-Gm-RC Continuous-Time Biquadratic Cells. ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING, 45(3), 281-294 [10.1007/s10470-005-4956-9].
Active-Gm-RC Continuous-Time Biquadratic Cells
Baschirotto, A
2005
Abstract
An analog CMOS low-pass Active-Gm-RC biquadratic cell is presented. The cell combines the advantage of GM-C filters (no parasitic poles) with the advantages of Active-RC filter (large linear range). Two additional digital-based circuits allow to control the pole frequency and to reduce the effects of the non-dominant poles. A 4th order low-pass Butterworth filter with a 2.11 MHz cut-off frequency and a DC-gain of 32 dB for UMTS receiver has been designed in a 0.18 mu m CMOS technology with 1.8 V supply voltage. The filter exhibits a -93 dBV input-referred noise with a power consumption of 2.16 mW while the linearity performances corresponds to an in-band IIP3 of 4 dBm and an out-of-band IIP3 of 35 dBm. An Active Gm-RC band-pass cell is presented as possible alternative applicationI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.