Peter Laaser

An 802.11a/b/g RF Transceiver in an SoC

The RF transceiver of a 0.13mum CMOS WLAN 802.11 a/b/g SoC for cellular applications comprising MAC, PHY, and analog front-end is presented. The transceiver with direct-conversion architecture and broadband 12GHz VCO draws 87/104mA in TX and 69/80mA in RX mode for the 2.4/5.0GHz band. The TX with control loop achieves -32dB EVM at -2dBm output power with 1.5V supply.

Sigma Delta Converters in Wireline Communications

The paper contains a review of Sigma Delta ADC development with focus on multi-bit Sigma Delta ADCs. Both, achievements in the Sigma Delta area and driving applications are presented. Wireline communication products employ Sigma Delta ADCs extensively in voice band modems, ISDN modems and ADSL modems. Especially in the latter ones multi-bit Sigma Delta modulators are used. Design examples for ADSL modems are presented and recent advances, such as low voltage and deep sub-micron converters are discussed. An outlook on the developments of Sigma Delta ADCs for ADSL and VDSL is given, also covering some aspects of continuous time Sigma Delta ADCs.