A 5nV/√Hz-IRN, 78dB-gain-range, 78dB-DR multi-standard baseband chain for Bluetooth, UMTS and WLAN

Abstract

An analog baseband chain for a multistandard (Bluetooth, WCDMA/UMTS, and WLAN) reconfigurable receiver in a 0.25 mum CMOS uses 1.65 mm . The structure is composed by an open-loop programmable-gain amplifier (PGA1), an active-Gm-RC low-pass filter (LPF), and a closed loop programmable-gain amplifier (PGA2). The chain gain can be programmed in the range -10divide68dB, while the input-referred noise (IRN) is 5nV/radicHz. In terms of linearity, the device features an in-band output referred intermodulation intercept point (OIP3) of 21dBm in UMTS mode, and a 1dB compression point of 1.3 dBm in WLAN mode. A dynamic range (DR) larger than 78 dB is achieved for a 1% total harmonic distortion (THD). The current consumption is minimized and adjusted for the different operation conditions, down to 11 mA for the full chain.