A 5.2 mW 240–550 MHz continuous-time low-pass filter and VGA for a UWB receiver in 0.18 μm CMOS process

摘要

A very low-power wide-band CMOS continuous-time low-pass filter for a ultra wideband system receiver in 0.18-μm CMOS technology is proposed. The cutoff frequency of the fourth-order LPF can be tuned within 240–550 MHz. The gain of the filter is tuned about 44 dB which can omit the variable gain amplifier (VGA) block. An IIP3 of 17.4 dBm is achieved for a power consumption of 5.2 mW from a 1.8 V power supply. Merging LPF and VGA into one block can efficiently reduce the power consumption and the chip area of the analog baseband channel while achieving a high linearity.