MULTI-STANDARD RECEIVER BASEBAND CHAIN USING DIGITALLY PROGRAMMABLE OTA BASED ON CCII AND CURRENT DIVISION NETWORKS

Abstract

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