Design of low power multi-standard active-RC filter for WLAN and DVB-H

In this paper, a low-power, highly linear, integrated, active-RC filter exhibiting a multi-standard (IEEE 802.11a/b/g and DVB-H) application and bandwidth (3 MHz, 4 MHz, 9.5 MHz) is present. The filter exploits digitally-controlled polysilicon resister banks and an accurate automatic tuning scheme to account for process and temperature variations. The automatic frequency calibration scheme provides better than 3 % corner frequency accuracy. The Butterworth filter is design for receiver (WLAN and DVB-H mode) and transmitter (WLAN mode). The filter dissipation is 3.4 mA in RX mode and 2.3 mA (only for one path) in TX mode from 2.85-V supply. The dissipation of calibration consumes 2 mA. The circuit has been fabricated in a 0.35 ¿m 47-GHz SiGe BiCMOS technology, the receiver and transmitter occupy 0.28-mm² and 0.16-mm² (calibration circuit excluded), respectively.