Multi-standard receiver baseband chain using digitally programmable OTA based on CCII and Current Division Networks

In this paper, a digitally programmable OTA based multi-standard receiver baseband chain is presented. The multistandard baseband receiver section consists of two programmable gain amplifiers (PGA1 and PGA2) and a fourth-order LPF filter. The receiver is suitable for Bluetooth/UMTS/WLAN/WiMAX standards. Three different programmable OTA architectures based on second generation current conveyors (CCII) and Current Division Networks (CDNs) are discussed. The programmable OTA with the lowest power consumption, moderate area and has good linearity - better than -50dB HD3- is selected to realize the multi-standard baseband receiver chain. The power consumption of the receiver chain is 6mW. The DC gain varies over a 68dB range with 1MHz to 13.6MHz programmable bandwidth. The receiver baseband chain is realized using 90nm CMOS technology model under ±0.5V voltage supply.