A tri-mode continuous-time /spl Sigma//spl Delta/ modulator with switched-capacitor feedback DAC for a GSM-EDGE/CDMA2000/UMTS receiver

Complex continuous-time fifth-order /spl Sigma//spl Delta/ modulator with 1b quantizer and switched-capacitor feedback DAC for a GSM/CDMA2000/UMTS receiver achieves a dynamic range of 92/83/74dB in 200/1228/3840kHz. Power consumption of one modulator is 3.8/4.1/4.5mW at 1.8V. Processed in 0.18/spl mu/m CMOS, the 0.55mm/sup 2/ IC includes a PLL, two oscillators and a bandgap reference.